Ventilators · Trilogy family

Philips Trilogy: troubleshooting and error codes

The ServiceForge knowledge base holds 50 documented symptoms for the Philips Trilogy, with 95 ranked causes, 99 diagnostic checks with test points and expected values, and 246 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Low Pressure Leak on air flow side patient safety

Leak detected on air flow side during pressure test (O2/202 only)

Ranked causes

1. Air duct to air element not seated (common)
2. Air element to mixer interface issues (common)
3. Mixer or O2 element connections (common)
4. O2 proportional valve not seating (occasional)
5. Sense tubes disconnected or damaged (occasional)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Audible Alarm does not beep 3 times at startup caution

Monitor powers on without expected three startup beeps

Ranked causes

1. Speakers not connected properly (common)
2. Faulty Speakers (occasional)
3. Faulty Front Panel PCA (rare)
4. Faulty System/CPU PCA (rare)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

High temperature alarm caution

Air stream temperature, motor temperature, or battery temperature exceeds safe limits

Ranked causes

1. Fan failure or blockage (common)
2. Battery overheating (occasional)
3. Motor overheating (occasional)
4. Air stream temperature sensor fault (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Valve Functional Fail on O2 valve patient safety

O2 proportional valve not opening or air path obstructed (O2/202 only)

Ranked causes

1. O2 valve not seated (common)
2. Foreign material in air path (occasional)
3. Faulty wire connection (rare)
4. Faulty OBM PCA (rare)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery not charging caution

Unable to charge detachable Li-Ion battery after 30 minutes of charging attempt

Ranked causes

1. Detachable Li-Ion battery fault (common)
2. Internal Li-Ion battery fault (occasional)
3. Power Management PCA fault (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Fan Test Fail caution

OBM fan not working or spinning (O2/202 only)

Ranked causes

1. Faulty OBM Fan (common)
2. Fan connection issue (common)
3. Faulty PCA (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

High Pressure Leak on O2 flow side patient safety

Leak detected on oxygen flow side during pressure test (O2/202 only)

Ranked causes

1. O2 proportional valve not seated (common)
2. Green tube or O-ring issues (common)
3. Pressure sensor leaking (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Patient circuit mismatch patient safety

Patient circuit does not match circuit type setting or tubing connection issues on active circuit

Ranked causes

1. Circuit type mismatch (common)
2. Tubing not connected properly (common)
3. Tubing disconnection or sensor failure (occasional)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not power on caution

Monitor does not respond to power button, no lights or activity

Ranked causes

1. No power available (common)
2. Front Panel Board On/Off circuit faulty (occasional)
3. System/CPU PCA does not recognize keypress (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit on but Display is blank caution

Monitor powered on but LCD shows no image or data

Ranked causes

1. LCD not connected properly (common)
2. Inverter not connected properly (occasional)
3. Faulty Driver on System/CPU PCA (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit powered on but Blower will not start caution

Power indicator on but ventilation blower motor does not run

Ranked causes

1. Blower not connected to PCA (common)
2. Blower faulty (occasional)
3. Faulty motor drive on PCA (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Checkout procedure incomplete or tests failed patient safety

One or more tests in the checkout procedure fail to complete as indicated, preventing device clearance for patient use

Ranked causes

1. Test setup not performed correctly (occasional)
2. Device hardware defect or damage (rare)

First check

Complete visual inspection

Test point: Device enclosure and components
Expected: No breaks, all screws present, handle secure, SD Card door secure, detachable battery secure, rubber feet in place

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Detachable Battery fails current test caution

External battery pack fails self-test or cannot enter operational mode

Ranked causes

1. Faulty External Battery (common)
2. Faulty Power Management Board (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Detachable battery not charging or displaying correctly patient safety

Detachable battery symbol does not appear on display, charge level does not show, or battery does not power device when AC disconnected

Ranked causes

1. Detachable battery not properly installed (common)
2. AC power disconnected during charging (occasional)

First check

Verify AC power connected and green LED lit

Test point: Front panel AC LED
Expected: Green AC LED illuminated

3 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Display blank but backlight working caution

LCD dark but background illumination active and working

Ranked causes

1. Dislodged LCD ribbon cable (common)
2. Faulty LCD ribbon cable (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Display flashes on and off sporadically caution

LCD screen intermittently turns off and back on during operation

Ranked causes

1. Bad power source (common)
2. CPU resetting (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Failures involving pressure or flow tests patient safety

Monitor fails pressure or flow sensor tests during calibration

Ranked causes

1. Tubing or porting block issues (common)
2. Faulty Sensor PCA (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

High internal oxygen level patient safety

O2 level inside OBM exceeds safe threshold (>30%) or O2 level between 25%-35%

Ranked causes

1. Disconnected O2 tubing in OBM (common)
2. O2 sensor fault in OBM (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Internal Battery fails current test caution

Battery fails self-test for current or cannot enter operational mode

Ranked causes

1. Faulty Detachable Battery (common)
2. Faulty Power Management Board (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low tidal volume delivery patient safety

Desired tidal volume cannot be delivered within IPAP Min and Max settings limits

Ranked causes

1. System leak or high leak rate (common)
2. Flow sensor problem (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

One alarm has lower pitch or tone caution

Speaker produces alarm at different volume or frequency than other alarms

Ranked causes

1. Faulty Speaker (common)
2. Faulty Front Panel PCA (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

PCA Communication Fail caution

PCA not communicating with system (O2/202 only)

Ranked causes

1. Faulty serial cable (common)
2. Faulty PCA (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Startup indicator LEDs do not light caution

Red yellow and white startup LEDs fail to illuminate during boot sequence

Ranked causes

1. Front Panel not connected properly (common)
2. Faulty Front Panel board (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Trilogy Error Code relating to Battery caution

Unit displays error code related to battery detection or testing

Ranked causes

1. Unit needs rebooted (common)
2. Erroneous read by Charger chip (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit and Display on but AC Power LED and Keypad not functioning caution

Monitor on with display active but power indicator and keypad inputs fail

Ranked causes

1. Front Panel not connected properly (common)
2. Faulty Front Panel board (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not detect Detachable Battery caution

Monitor fails to recognize or charge detachable battery pack

Ranked causes

1. Internal connections not connected properly (common)
2. Faulty Detachable Battery (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not detect External Lead Acid battery caution

Monitor fails to recognize external lead acid backup battery

Ranked causes

1. Battery not connected properly (common)
2. Faulty External Lead Acid battery (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not detect Internal Battery caution

Monitor fails to recognize built-in internal battery

Ranked causes

1. Battery not connected properly (common)
2. Faulty Internal Battery (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit won't reach Pressure Therapy settings patient safety

Monitor cannot achieve configured pressure settings during initialization

Ranked causes

1. Incorrect settings (common)
2. Tubing setup incorrectly (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Performance Verification (PV) Tool setup and execution

Software-based verification of Trilogy ventilator essential performance and safety using the PV Tool application on a PC with specified measurement devices

Ranked causes

1. PV Tool requires download and installation on registered PC (common)

First check

Verify PC meets minimum system requirements

Test point: Computer specifications
Expected: 400 MHz Processor, 256 MB RAM, 500 MB Hard Disk Space, CDROM Drive, RS-232 or USB with RS-232 Adapter, Windows XP SP3 / Vista / Windows 7, 16-bit color video 800x600 resolution

10 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: PV Tool software configuration

Configuration of PV Tool application settings including working folder location and display font preferences

Ranked causes

1. PV Tool working folder and display settings require configuration (occasional)

First check

Access PV Tool Options screen

Test point: Tools menu
Expected: Tools menu contains Options item, selecting Options displays options pop-up window

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Trilogy 100 Checkout patient safety

Complete system checkout and verification procedure for Trilogy 100 ventilator prior to patient use

Ranked causes

1. System requires checkout verification before patient use (common)

First check

Perform visual inspection of enclosure

Test point: Device exterior
Expected: No breaks in enclosure; all screws present and secure

20 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Circuit Disconnect alarm not functioning patient safety

Alarm should sound High Priority audible indicator, flash red light on Alarm Indicator/Audio Pause button, and display Circuit Disconnect alarm condition highlighted in red on screen within 10 seconds of disconnection

Ranked causes

1. Circuit Disconnect alarm setting not configured correctly (common)

First check

Disconnect test lung from circuit

Test point: Patient connection end of circuit
Expected: Test lung removed from circuit

4 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Current Test Fails caution

Idle current outside acceptable limits (O2/202 only)

Ranked causes

1. Faulty PCA (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Detachable battery not functioning

Device operates on detachable battery when AC power is disconnected; battery symbol appears on display with charge level and black box indicating active use

Ranked causes

1. Detachable battery not properly installed or not charged (common)

First check

Verify green AC LED is lit with AC power connected

Test point: Front panel AC LED
Expected: Green AC LED lit

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Detachable battery not functioning or not charging patient safety

Battery symbols do not appear on display, battery does not maintain device operation when AC power disconnected, or charge symbol not displaying when battery depleted

Ranked causes

1. Detachable battery not installed or not functioning (unknown)

First check

Connect AC power and verify green AC LED on front panel

Test point: Front panel AC LED
Expected: Green LED lit

5 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

External battery not charging or displaying correctly patient safety

External battery symbol does not appear on display, charge level does not show, or device does not operate on external battery when AC disconnected

Ranked causes

1. External battery cable not properly connected (common)

First check

Verify AC power connected and green LED lit

Test point: Front panel AC LED
Expected: Green AC LED illuminated

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

External battery not functioning

Device operates on external battery when AC power is disconnected; external battery symbol appears on display with charge level and black box indicating active use

Ranked causes

1. External battery not properly connected or not charged (common)

First check

Verify green AC LED is lit with AC power connected

Test point: Front panel AC LED
Expected: Green AC LED lit

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

External battery not functioning when connected patient safety

External battery symbol does not appear on display, external battery does not maintain device operation when AC power disconnected, or battery not charging

Ranked causes

1. External battery not connected properly or not functioning (unknown)

First check

Connect AC power and verify green AC LED lit

Test point: Front panel AC LED
Expected: Green LED lit

4 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

High Inspiratory Pressure alarm not functioning patient safety

Alarm should sound Medium Priority audible indicator, flash yellow light on Alarm Indicator/Audio Pause button, and display High Inspiratory Pressure alarm condition highlighted in yellow on screen within 40 seconds

Ranked causes

1. High Inspiratory Pressure alarm setting not configured correctly or threshold set too high (common)

First check

Verify Medium Priority audible indicator sounds

Test point: Alarm Indicator/Audio Pause button
Expected: Medium Priority audible indicator sounds within 40 seconds

3 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

High positive flow at calibration caution

Flow calibration produces higher than expected positive flow reading

Ranked causes

1. Flow Straightener damaged or missing (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

High Tidal Volume alarm not functioning patient safety

Alarm should sound High Priority audible indicator, flash red light on Alarm Indicator/Audio Pause button, and display High Tidal Volume alarm condition highlighted in red on screen within 40 seconds

Ranked causes

1. High Tidal Volume alarm setting not configured correctly (common)

First check

Verify High Priority audible indicator sounds

Test point: Alarm Indicator/Audio Pause button
Expected: High Priority audible indicator sounds

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Internal lithium-ion battery not charging or displaying correctly patient safety

Internal battery symbol does not appear on display, charge level does not show, or device does not operate on internal battery when detachable battery disconnected

Ranked causes

1. Detachable battery disconnected or not installed (common)

First check

Disconnect AC power first

Test point: AC power
Expected: AC power disconnected

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Internal lithium-ion battery not functioning

Device operates on internal battery when detachable battery is disconnected; internal battery symbol appears on display with charge level and black box indicating active use

Ranked causes

1. Internal battery not charged or not functioning (common)

First check

Verify detachable battery is fully disconnected

Test point: Device battery compartment
Expected: Detachable battery removed

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Internal lithium-ion battery not functioning or not charging patient safety

Internal battery symbol does not appear on display, battery does not maintain device operation when AC power and detachable battery disconnected, or battery not charging with AC power

Ranked causes

1. Internal lithium-ion battery not functioning or not charging properly (unknown)

First check

Verify initial battery charge levels with AC power and detachable battery connected

Test point: Display screen
Expected: Both battery symbols visible with charge indication

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low Inspiratory Pressure alarm not functioning patient safety

Alarm should sound High Priority audible indicator, flash red light on Alarm Indicator/Audio Pause button, and display Low Inspiratory Pressure alarm condition highlighted in red on screen within 40 seconds

Ranked causes

1. Low Inspiratory Pressure alarm setting not configured correctly or threshold set too high (common)

First check

Verify High Priority audible indicator sounds

Test point: Alarm Indicator/Audio Pause button
Expected: High Priority audible indicator sounds within 40 seconds

3 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low Tidal Volume alarm not functioning patient safety

Alarm should sound High Priority audible indicator, flash red light on Alarm Indicator/Audio Pause button, and display Low Tidal Volume alarm condition highlighted in red on screen within 40 seconds

Ranked causes

1. Low Tidal Volume alarm setting not configured correctly (common)

First check

Verify High Priority audible indicator sounds

Test point: Alarm Indicator/Audio Pause button
Expected: High Priority audible indicator sounds

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

O2 blending not delivering set FiO2 or Low Oxygen Flow/Inlet Pressure alarms not functioning patient safety

Delivered FiO2 does not match set level, or alarms fail to sound when oxygen supply is disconnected

Ranked causes

1. O2 blending system not functioning or alarms not triggering on low oxygen supply (unknown)

First check

Connect external O2 monitor in-line with patient tube

Test point: Patient tube connection
Expected: O2 monitor properly installed and calibrated

6 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Solid alarm with Lead Acid or AC power fail patient safety

Continuous alarm when using Lead Acid backup or AC fail with good Li-ion

Ranked causes

1. CPU rebooting or not running (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Vent Service Required before upgrade caution

System indicates maintenance needed before proceeding with software update

Ranked causes

1. E143 error in log (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`AC Power Disconnected`	AC power source lost; device switched to alternate power source	Loss of AC mains power	info
`AC Power Disconnected alarm`	AC power source has been disconnected from the ventilator	AC power input removed or interrupted	info
`Apnea`	Patient has not triggered breath within apnea alarm time setting	No patient breath detected within apnea alarm time setting	critical
`Battery Discharging Stopped Due to Temperature`	Battery overheated during discharge; battery disabled and power switched	Detachable or internal battery becomes overheated while providing power	info
`Batt Not Charging - Temp.`	Battery too hot while charging or device was in too cold environment before charging	Detachable or internal battery temperature out of range during charging	info
`Card Error`	Unusable SD card inserted into ventilator	SD card insertion with unrecognized or corrupted card	info
`Check Circuit`	Patient circuit problem detected	Pinched or detached tubing, water in proximal pressure lines, or active exhalation device problem	critical
`Check External Battery`	Bad connection to external battery or external battery failed	External battery connection loss or external battery failure	info
`Circuit Disconnect`	Breathing circuit disconnected or has large leak	Circuit is disconnected or has large leak	critical
`Circuit Disconnect alarm`	Patient circuit or test lung has been disconnected from ventilator	No circuit pressure detected for the set disconnect timeout period (10 seconds)	warning
`Detachable Batt Disconnected`	Detachable battery power source lost; device switched to internal battery	Loss of detachable battery connection	info
`Detach Batt Disconnected alarm`	Detachable battery pack has been disconnected from the device	Detachable battery removed or connection lost	info
`Detach Battery Not Charging or Internal Battery Not Charging`	Battery error condition prevents charging	Device detects error condition with battery	info
`E-100`	Software error or bad calibration table	Software error or bad table written during production/field calibration	error
`E-101`	Program execution error	Program execution error occurs	critical
`E-103`	Control Flow Sensor out of specification	Control Flow Sensor reading outside electrical specification	critical
`E-106`	Speaker 1 failed or not installed	Speaker 1 failed or not installed	error
`E-107`	Speaker 2 failed or not installed	Speaker 2 failed or not installed	error
`E-109`	High expiratory pressure	Patient pressure during exhalation > Exhaled Pressure Setting + 5 cm for >= 5 seconds	warning
`E-110`	Low inspiratory pressure	Delivered inhalation pressure below target in CPAP/S/S-T/T/PC/PC-SIMV or below Low PIP setting in CV/AC/CIMV	warning
`E-111`	High respiratory rate	Measured Breath Rate >= alarm setting	warning
`E-112`	Low respiratory rate	Measured Breath Rate <= alarm setting	warning
`E-113`	High minute ventilation	Measured Minute Ventilation >= alarm setting	warning
`E-114`	Low minute ventilation	Measured Minute Ventilation <= alarm setting	warning
`E-115`	High inhaled tidal volume	Measured inhaled tidal volume >= alarm setting	warning
`E-116`	Low inhaled tidal volume	Measured inhaled tidal volume <= alarm setting	warning
`E-118`	Circuit leak too small to detect	Leak in system below detection threshold or high circuit impedance	warning
`E-119`	Battery charging detected when no AC power present	Charging detected without AC connection	error
`E-120`	Apnea detected	No spontaneous breathing detected within alarm time window; may be masked by high leak	warning
`E-121`	Circuit disconnect detected	High flow condition or pressure drop indicating disconnection	error
`E-122`	Unable to write to event log	Event log write failure	error
`E-123`	Shorted Q29 FET in Li-Ion battery discharge path	Discharge path FET shorted on power management PCA	error
`E-125`	Multiple reboots within 24 hours	3 reboots occurred within 24 hours	error
`E-130`	Pressure sensor zero point drift exceeds limit	Sensor drift causes zero point displacement beyond acceptable range	error
`E-131`	Control pressure sensor reading extreme value	Control pressure sensor stuck at maximum or minimum counts for extended time	error
`E-132`	Monitor pressure sensor reading extreme value	Monitor pressure sensor stuck at maximum or minimum counts for extended time	error
`E-133`	Proximal pressure sensor reading extreme value	Proximal pressure sensor stuck at maximum or minimum counts for extended time	error
`E-134`	Control flow sensor reading maximum or minimum counts	Extended period of sensor out-of-range reading	error
`E-135`	Monitor flow sensor reading maximum or minimum counts	Extended period of sensor out-of-range reading	error
`E-136`	Air stream temperature sensor reading maximum or minimum counts	Extended period of sensor out-of-range reading	error
`E-137`	dP pressure temperature sensor reading maximum counts	Extended period of sensor maximum reading	error
`E-138`	Barometric pressure sensor reading outside valid range	Sensor reading out of valid range	error
`E-139`	Software error	Software fault detected	error
`E-14`	Board revision mismatch	Resistors not installed or software running on wrong board revision	critical
`E-141`	Motor connector solder defect or rotor locked	Motor connector not soldered correctly or rotor mechanically locked	critical
`E-143`	Control or monitoring pressure sensor drift exceeded	Sensor has drifted too far from reference	error
`E-145`	Both pressure sensors and ADC failed	Both control and monitoring pressure sensors failed or ADC failed	critical
`E-146`	Both pressure sensors and ADC failed	Both control and monitoring pressure sensors failed or ADC failed	critical
`E-147`	Sensor zero-point drift exceeded limit	Positive or negative displacement moves pressure range beyond expected values	error
`E-149`	Auto-null valve opening test failed during drift computation	Control pressure not dropping sufficiently after valve opens, or inadequate pressure before opening	error
`E-15`	Hardware current limiting not working correctly	Current limiting circuit failure	error
`E-158`	Serious alarm during startup before backup therapy initiated	Serious alarm before 6 breaths, prevents backup therapy from starting	critical
`E-159`	Power management fault, unit does not enter sleep on AC removal	Sleep mode entry failure when AC power removed	error
`E-16`	Power management board or battery problem	Power management fault or battery issue with no AC present	error
`E-160`	Insufficient air flow detected	Obstructed intake, flow path, pressure tubing, or faulty blower	critical
`E-161`	Internal lithium-ion battery thermal runaway protection or fault detected	Li-Ion discharge overcurrent, discharge short circuit, PMB fault, system board fault	critical
`E-162`	Detachable battery requires replacement	Li-Ion battery TDA triggered by discharge overcurrent or short circuit	error
`E-163`	Control Flow Sensor out of specification	Control Flow Sensor reading outside electrical specification	critical
`E-164`	Monitor flow sensor out of electrical specification	Sensor electrical spec violation	error
`E-165`	Low expiratory pressure	Expiratory pressure remains below EPAP/CPAP/PEEP minus 5 units for 5+ seconds	warning
`E-17`	Motor capacitor fault or improper value	Motor capacitor not installed, wrong value, or end-of-life	error
`E-170`	High inspiratory pressure alarm	Inhalation pressure exceeds setting; in CPAP/S/S-T/T/PC/PC-SIMV exceeds highest + 5 cm; in CV/AC/SIMV exceeds High PIP Alarm	warning
`E-171`	High inspiratory pressure alarm	Inhalation pressure exceeds setting; similar to E-170	warning
`E-172`	High pressure delivery exceeds 60 cm H2O	Unit exceeds 60cm delivered pressure or sensor reading high with excessive drift	error
`E-173`	Ventilator started on battery power	Unit powered up using battery rather than AC mains	info
`E-174`	Cannot communicate with charger chip	Charger chip communication loss	error
`E-175`	Cannot communicate with internal Li-Ion battery after multiple attempts	Li-Ion communication failure after 5 attempts, charger not performing wake-up charge	error
`E-176`	Cannot communicate with detachable Li-Ion battery	Charger unable to establish communication with battery; may take up to 210 seconds for alarm	error
`E-177`	Internal Li-Ion battery is not authentic	Counterfeit battery detected	critical
`E-178`	Non-authentic detachable battery detected	Battery authentication verification failed; fake or counterfeit battery installed	error
`E-179`	AC power disconnected	AC mains power supply lost or disconnected	critical
`E-18`	DC/DC converter circuitry failure	DC/DC converter fault	error
`E-180`	External lead-acid battery disconnected	External power source disconnected or lost connection	error
`E-181`	Detachable Li-Ion battery disconnected	Detachable Li-Ion connector unplugged or connection lost	error
`E-183`	Low external lead-acid battery	Lead Acid battery has less than 20 minutes run time remaining and is last available power source	warning
`E-184`	Low detachable Li-Ion battery	Detachable Li-Ion has less than 20 minutes run time remaining and is last available power	warning
`E-185`	Low internal Li-Ion battery	Internal Li-Ion has less than 20 minutes run time remaining and is last available power	warning
`E-186`	Depleted external lead-acid battery	Lead Acid battery has less than 10 minutes run time remaining and is last power source	critical
`E-187`	Depleted detachable Li-Ion battery	Detachable Li-Ion has less than 10 minutes run time remaining and is last power source	critical
`E-188`	Depleted internal Li-Ion battery	Internal Li-Ion has less than 10 minutes run time remaining and is last power source	critical
`E-189`	Internal or detachable Li-Ion battery unable to power system	Battery voltage V_battLi less than 9 volts for greater than 10 seconds	error
`E-19`	DC/DC converter circuitry failure	DC/DC converter fault	error
`E-191`	AFE chip not receiving appropriate frequency on WDI pin from gas gauge	Frequency loss on WDI pin from gas gauge chip in Li-Ion battery pack	error
`E-192`	Detachable Li-Ion frequency monitoring fault	AFE chip not receiving appropriate frequency from Gas Gauge chip on Li-Ion battery	error
`E-193`	Internal Li-Ion battery permanent failure	Permanent battery failure detected	error
`E-194`	Detachable Li-Ion permanent failure	Battery cell internal fault or catastrophic failure detected	error
`E-195`	Internal Li-Ion battery state of health below 50%	Full charge capacity (FCC) less than 51% of design capacity	warning
`E-196`	Detachable Li-Ion state of health degraded	Battery State of Health less than 50%; Full Charge Capacity less than 51% of design capacity	warning
`E-197`	Internal Li-Ion battery not present	Charger chip status indicates battery missing	error
`E-198`	Circuitry failure	Internal circuit fault	error
`E-199`	Battery or power management failure	Detachable Battery harness failure, Power Management Board failure, or circuitry failure	error
`E-200`	System circuitry failure	Circuitry failure in system	error
`E-201`	Power management failure	Power Management Board Failure or circuitry failure	error
`E-202`	System or interface circuitry failure	Circuitry failure	error
`E-203`	Circuitry failure detected	Internal circuitry fault	error
`E-204`	U3 or CPLD component failure	U3 failure or CPLD failure	error
`E-205`	Shorted power management FET Q25 or Q26 in battery discharge path	FET shorted in discharge path on power management PCA	error
`E-206`	Detachable Li-Ion gas gauge corruption	Battery fuel gauge data corruption or checksum failure	error
`E-207`	Q11 failure on power management PCA	Q11 transistor failure	error
`E-208`	Internal Li-Ion cycle count exceeded 475 cycles	Cycle count exceeds 475 cycles	warning
`E-209`	Detachable Li-Ion end of life - cycle count	Battery cycle count exceeds 5500 cycles; battery end of life reached	warning
`E-21`	DSP-Host serial communication failure	Problem with serial communication between DSP and Host	critical
`E-218`	Internal Li-Ion discharge stopped due to high temperature	Charge current exceeds 4A for >2sec during high temp discharge; charge FET turned off; recovers if temp < 55°C	warning
`E-219`	Detachable Li-Ion discharge stopped due to high temperature	Charge current exceeds 4A for >2sec during high temp discharge; charge FET off; recovers if temp < 55°C	warning
`E-22`	Motor temperature sensor failure or U37 circuitry problem	Temp sensor fault or integrated circuit failure	error
`E-23`	Internal DSP watchdog failure	DSP watchdog timer triggered	error
`E-230`	Internal Li-Ion not charging - temperature out of range	Internal Li-Ion temp > 45°C or < 0°C when charging initiated; > 50°C or < -2.5°C during charge	warning
`E-231`	Detachable Li-Ion not charging - temperature out of range	Detachable Li-Ion temp > 45°C or < 0°C when charging initiated; > 50°C or < -2.5°C during charge	warning
`E-234`	Software upgrade failed - unable to open file	Cannot open new software file on SD card	error
`E-235`	Software upgrade failed - unable to read file	Cannot read software file or file is corrupted	error
`E-236`	Software upgrade failed - attempted downgrade	User attempted to install older software version than currently installed	warning
`E-237`	Software upgrade failed - wrong version for device	Software file not intended for Trilogy Ventilator model	error
`E-238`	Software upgrade failed - corrupted file	New software file on card is corrupted or damaged	error
`E-239`	Software upgrade failed - Host CPU programming failed	Unable to write new software to Host CPU	critical
`E-240`	Software upgrade failed - wrong version for device	Software not intended for Trilogy Ventilator model	error
`E-241`	Software upgrade failed - DSP programming failed	Unable to write new software to DSP processor	critical
`E-242`	Software upgrade failed - Host CPU programming error	Unable to program Host CPU with new software	critical
`E-245`	All power sources depleted - system shutdown	Last battery completely discharged; all power sources exhausted	critical
`E-246`	Internal Li-Ion not charging	Unable to charge Internal Li-Ion battery after 30 minutes	error
`E-247`	Detachable battery not charging	Unable to charge detachable Li-Ion battery after 30 minutes	error
`E-253`	Host-DSP communication failure	Host CPU unable to communicate with DSP	error
`E-265`	Li-Ion battery not detected by safety signal when communication attempted	Charger safety signal indicates battery absent but device tries to communicate	error
`E-266`	Detachable battery missing or not detected	Charger chip safety signal indicates battery not present when communication attempted	error
`E-267`	Full charge capacity exceeds 150% of Li-Ion design capacity	FCC corruption or gas gauge error	error
`E-269`	Open VBULK FET in AC/DC power path to boost converter	VBULK FET failure on power management PCA	error
`E-270`	Open Q11 FET controlling Li-Ion battery discharge post VbattLi	Q11 FET failure open circuit	error
`E-271`	Battery discharge path failure	Open Q13, Q14 transistors in Lead Acid battery discharge path	error
`E-272`	Charger chip or FET failure detected	Power management component failure	error
`E-273`	Unit not calibrated or calibration table corrupted	Missing or corrupted calibration data	error
`E-274`	Unit not calibrated or calibration table corrupted	Missing or corrupted calibration data	error
`E-280`	External battery depleted	Lead Acid battery voltage drops below usable level	warning
`E-281`	Detachable battery depleted	Detachable Li-Ion battery voltage drops below usable level	warning
`E-282`	Internal battery depleted	Internal Li-Ion battery voltage drops below usable level	warning
`E-283`	Software upgrade completed	Software upgrade process finishes successfully	info
`E-289`	Multiple service-level errors pending	One or more Ventilator Service Recommended errors active	warning
`E-290`	One or more ventilator service required errors active	Multiple service-level errors present in system	error
`E-291`	Circuit type mismatch or sensor failure	Patient circuit does not match selected circuit type or sensor fault detected	warning
`E-299`	SD card insufficient memory	Card does not have enough memory for EDF waveform and event log files	error
`E-300`	SD card write protected	Card detected as write protected SD card	error
`E-301`	SD card file system error	Error creating files or directories on SD card	error
`E-302`	Voltage reference on internal ADC failed	ADC reference voltage loss	error
`E-304`	O2 sensor failed	O2 sensor failure detected	error
`E-305`	High internal oxygen concentration	O2 level between 25% and 35%	error
`E-306`	Disconnected or faulty O2 tubing or high O2 level	O2 tubing disconnected or O2 level exceeds 35%	error
`E-307`	High temperature detected	Air stream, motor, or battery temperature exceeds limit	error
`E-308`	High temperature detected	Air stream, motor, or battery temperature exceeds limit	error
`E-309`	External battery fault or connection issue	Lead Acid battery in use while current drawn from Li-Ion or battery connection fault	error
`E-31`	3.3V DSP power supply failure	Problem with +3.3V_DSP, U23 failure, or DSP failure	error
`E-311`	Unit not calibrated or calibration table destroyed	Missing or destroyed calibration data	error
`E-312`	Prescription change pending	Usable prescription found on SD card during update	info
`E-313`	Prescription ready for review	Prescription from SD card is ready for user review	info
`E-314`	Prescription update failed: card read only	Prescription is only for current device and card is read only	error
`E-315`	Prescription serial number mismatch	Serial number in prescription does not match device serial number	info
`E-316`	Prescription circuit type mismatch	Circuit type in prescription does not match device circuit type	info
`E-317`	Prescription update failed due to bad settings	Failure to update prescription due to errors in settings	error
`E-318`	Prescription update completed successfully	Prescription update process completes without error	info
`E-319`	Prescription update cancelled	User cancels update via UI or removes card before completion	info
`E-32`	Sensor Board cable or circuitry fault	Faulty Sensor Board Cable or circuitry	error
`E-320`	Prescription update failed: file format error	Failure to update due to file format error or read error	error
`E-321`	Prescription update failed: invalid version	Prescription version incompatible with device	error
`E-322`	Prescription update failed: bad checksum	Prescription checksum is incorrect or does not validate	error
`E-323`	SD Card settings restoration error	Error during restoration of old settings after SD Card Rx update failure	error
`E-333`	U24 or U26 circuitry failure on system board	Integrated circuit failure	error
`E-338`	Unit not calibrated or calibration table corrupted	Missing or corrupted calibration data	error
`E-339`	Pressure sensor drift detected	Temperature table insufficient for pressure sensor temperature compensation	warning
`E-340`	CPLD stopped sending alive signal to host CPU	CPLD communication loss	error
`E-342`	Low oxygen blending module inlet pressure	Pressure at OBM inlet below 40 psi	critical
`E-343`	High oxygen blending module inlet pressure	Pressure at OBM inlet above 87 psi	critical
`E-344`	Oxygen blending module failure detected	Oxygen blending module fault	error
`E-345`	Internal O2 sensor end of life or watchdog fault	O2 sensor at end of life or watchdog failure	error
`E-348`	Software upgrade to OBM failed	OBM does not accept new software version	error
`E-349`	Communication lost between host and oxygen blending module	OBM communication loss with host CPU	error
`E-351`	Low oxygen flow delivered	Delivered oxygen concentration less than FiO2 set point minus 10%	error
`E-352`	High oxygen flow delivered	Delivered oxygen concentration greater than FiO2 set point plus 10%	error
`E-354`	Unit not calibrated or calibration table corrupted	Unit not calibrated or O2 Sensor Calibration Table corrupted	error
`E-356`	Sensor auto-null valve did not open fully	Auto-null valve opening test failure during drift computation	error
`E-357`	Control Flow Sensor out of specification	Control Flow Sensor reading outside electrical specification	error
`E-358`	Proximal flow sensor out of electrical specification	Sensor electrical spec violation	error
`E-359`	High oxygen level inside OBM	O2 level inside OBM exceeds 30%	error
`E-36`	CPLD programming or hardware failure	CPLD not programmed, pin 15 shorted, or CPLD failed	error
`E-360`	Low tidal volume	Desired tidal volume cannot be delivered within IPAP Min/Max settings	error
`E-37`	Host CPU rebooting	Host CPU is constantly rebooting	critical
`E-53`	High exhaled tidal volume	Measured Exhaled Tidal Volume >= alarm setting	warning
`E-54`	Low exhaled tidal volume	Measured Exhaled Tidal Volume <= alarm setting	warning
`E-64`	Unit not calibrated or calibration table corrupted	Unit not calibrated or calibration table corrupted	error
`E-65`	Unit not calibrated or calibration table corrupted	Unit not calibrated or calibration table corrupted	error
`E-66`	Unit not calibrated or calibration table corrupted	Unit not calibrated or calibration table corrupted	error
`E-67`	Pressure sensor zero point drift exceeds limit	Sensor drift causes zero point displacement beyond acceptable range	error
`E-68`	Shorted Li-Ion battery discharge FET on power management PCA	Discharge path FET shorted on power management board	error
`E-69`	Pressure sensor zero point drift exceeds limit	Sensor drift causes zero point displacement beyond acceptable range	error
`E-70`	Pressure sensor zero point drift exceeds limit	Sensor drift causes zero point displacement beyond acceptable range	error
`E-71`	Parameter settings corrupted	Parameter Settings become corrupted	critical
`E-73`	Parameter settings corrupted	Parameter Settings become corrupted	critical
`E-76`	Defective EEPROM	EEPROM failure detected	critical
`E-77`	EEPROM defect or program execution error	Defective EEPROM or program execution error	critical
`E-78`	Unable to read valid time from RTC chip	Real-time clock communication or read failure	error
`E-79`	RTC time does not match host CPU time	Real-time clock time mismatch with CPU	error
`E-80`	Pressure sensor zero point drift exceeds limit	Sensor drift causes zero point displacement beyond acceptable range	error
`E-81`	SD card error	Faulty SD card detected	error
`E-83`	Card error	Foreign object in slot, unformatted card, or card removed prematurely	error
`E-84`	Card error	Foreign object in slot, unformatted card, or card removed prematurely	error
`E-85`	Card error	Foreign object in slot, unformatted card, or card removed prematurely	error
`E-86`	Card error	Foreign object in slot, unformatted card, or card removed prematurely	error
`E-87`	Card error	Foreign object in slot, unformatted card, or card removed prematurely	error
`E-88`	Card error	Foreign object in slot, unformatted card, or card removed prematurely	error
`E-89`	Card error	Foreign object in slot, unformatted card, or card removed prematurely	error
`E-9`	Motor failure or capacitor not installed	Motor capacitor missing, improper solder joint, or motor rotor locked	critical
`E-90`	Software-hardware revision incompatibility	Software does not support hardware revision or resistors incorrectly configured	critical
`E-93`	Keypad stuck	Key held down for 2 minutes	warning
`E-94`	Barometric pressure sensor reading extreme value	Barometric pressure sensor reading maximum or minimum counts for extended time	error
`External Batt Disconnected`	External battery power source lost; device switched to alternate power source	Loss of external battery connection	info
`External Battery Depleted or Detachable Battery Depleted`	Affected battery is fully depleted	Battery charge level reaches zero	info
`High Expiratory Pressure`	Delivered pressure exceeds target by 5+ pressure units during expiration	Delivered pressure exceeds target patient pressure by 5 units during expiratory phase	critical
`High Inspiratory Pressure`	Measured or delivered pressure exceeds inspiratory limit (escalating alarm)	Measured pressure exceeds High Inspiratory Pressure setting (volume mode) or delivered pressure exceeds target by 5+ units (pressure mode)	critical
`High Inspiratory Pressure alarm`	Inspiratory pressure has exceeded the set high threshold	Peak inspiratory pressure exceeds High Inspiratory Pressure setting (60 cmH2O in test)	warning
`High Internal Oxygen`	Oxygen concentration 5% above ambient inside device due to internal leak	Internal oxygen concentration reaches 5% above ambient levels	critical
`High Minute Ventilation`	Patient minute ventilation exceeds High Minute Ventilation setting	Patient minute ventilation greater than High Minute Ventilation setting	critical
`High Oxygen Flow`	Oxygen concentration 10% above FiO2 set point for >30 seconds	Device oxygen output 10% above set FiO2 for more than 30 seconds	critical
`High Oxygen Inlet Pressure`	Oxygen source pressure exceeds 87 psi	Oxygen source pressure measures greater than 87 psi	critical
`High Respiratory Rate`	Respiratory rate exceeds High Respiratory Rate setting	Measured respiratory rate greater than High Respiratory Rate setting	critical
`High Temperature`	Patient airstream or internal device temperature too high (escalating alarm)	High patient airstream or internal device temperature detected	warning
`High Tidal Volume alarm`	Tidal volume has exceeded the set high threshold	Measured Tidal Volume exceeds High Vte/High Vti setting	warning
`High Vte`	Estimated exhaled tidal volume exceeds High Vte setting	Estimated exhaled tidal volume greater than High Vte setting	critical
`High Vti`	Delivered tidal volume exceeds High Vti setting	Delivered tidal volume greater than High Vti setting	critical
`Keypad Stuck`	Key lodged inside device case	Key becomes lodged inside device case	info
`Loss of Power`	Complete power failure occurred; internal battery depleted while providing therapy	Power lost and internal battery was only power source and completely depleted	critical
`Low Battery`	Last available battery low or nearly depleted (escalating alarm)	Approximately 20 minutes remaining (medium); approximately 10 minutes remaining (high)	warning
`Low Circuit Leak`	Leak device in passive circuit not functioning properly	System detects problem with passive circuit leak device	critical
`Low Expiratory Pressure`	Delivered pressure 5+ units below target during expiration	Delivered pressure is 5 or more units below target during expiratory phase	critical
`Low Inspiratory Pressure`	Measured or delivered pressure below inspiratory minimum (volume/pressure mode dependent)	Measured pressure below Low Inspiratory Pressure setting (volume mode) or delivered pressure 5+ units below target (pressure mode)	critical
`Low Inspiratory Pressure alarm`	Inspiratory pressure has fallen below the set low threshold	Peak inspiratory pressure falls below Low Inspiratory Pressure setting (6 cmH2O in test)	warning
`Low Minute Ventilation`	Patient minute ventilation below Low Minute Ventilation setting	Patient minute ventilation less than Low Minute Ventilation setting	critical
`Low Oxygen Flow`	Oxygen concentration 10% below FiO2 set point for >30 seconds	Device oxygen output 10% below set FiO2 for more than 30 seconds	critical
`Low Oxygen Flow alarm`	Oxygen flow rate or delivery has fallen below acceptable level	Oxygen supply pressure or flow drops below minimum threshold for ~1 minute	warning
`Low Oxygen Inlet Pressure`	Oxygen source pressure below 40 psi	Oxygen source pressure measures less than 40 psi	critical
`Low Oxygen Inlet Pressure alarm`	Oxygen inlet pressure has fallen below the minimum required threshold	O2 inlet pressure drops below ~20 psi for ~1 minute	warning
`Low Respiratory Rate`	Respiratory rate below Low Respiratory Rate setting	Measured respiratory rate less than Low Respiratory Rate setting	critical
`Low Tidal Volume alarm`	Tidal volume has fallen below the set low threshold	Measured Tidal Volume falls below Low Vte/Low Vti setting	warning
`Low Vte`	Estimated exhaled tidal volume below Low Vte setting	Estimated exhaled tidal volume less than Low Vte setting	critical
`Low Vti`	Delivered tidal volume below Low Vti setting	Delivered tidal volume less than Low Vti setting	critical
`Replace Detachable Battery`	Detachable battery nearing end of life or has failed	Battery nearing end of useful life or failure preventing charging/discharging	warning
`Start On Battery`	Ventilator started on battery power with no AC power available	Device startup occurs when only battery power is available	info
`Ventilator Inoperative`	Internal error or condition detected that may affect therapy delivery	Device detects an internal error or unsafe condition	critical
`Ventilator Inoperative`	Ventilator has entered an inoperative state and cannot deliver therapy	Unspecified internal fault or system failure	critical
`Ventilator Service Recommended`	Non-critical error detected that does not affect performance or safety	Device detects error that will not affect device performance or safety	warning
`Ventilator Service Required`	Device cannot perform to specification or backup safety feature is compromised	Device cannot meet specifications or therapy delivery is compromised	critical

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ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.