Ventilators

VersaMed iVent201: troubleshooting and error codes

The ServiceForge knowledge base holds 73 documented symptoms for the VersaMed iVent201, with 101 ranked causes, 128 diagnostic checks with test points and expected values, and 12 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Erratic exhale tidal volumes patient safety

Delivered breaths vary unpredictably in size despite volume control mode setting, some breaths smaller than normal with pink person breath type icon

Ranked causes

1. Pressure support extra breaths triggered during volume control (common)
2. Flow offset due to calibration error (occasional)
3. Leak at patient interface or test lung (common)
4. Flow sensitivity set too low (occasional)

First check

Observe breath types and sizes during operation

Test point: Ventilator display breath type icon
Expected: Pink person icon indicates extra breaths during pressure support

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

Battery run time too short or Battery indicator never displays full patient safety

Battery depletes faster than expected; indicator remains empty even after charging

Ranked causes

1. Battery capacity is inadequate (common)
2. Unit goes into functional failure but no Empty Battery alarm (occasional)
3. Battery indicator displays empty after recharge; Defective Electronic Module (rare)

First check

Measure actual battery run time under standard load

Test point: Unit operation timer
Expected: Run time meets or exceeds manufacturer specifications

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

Exhale tidal volume measurement inaccuracy patient safety

Exhale VT measurement differs from set tidal volume by more than 10% under controlled test bench conditions with verified calibration and patient circuit substitution

Ranked causes

1. Leak in test lung or circuit (common)
2. High velocity exhale from undersized test lung (occasional)
3. MAQUET (Siemens 190) test lung characteristics interfere with measurement (occasional)

First check

Verify exhale volume matches set tidal volume within ±10%

Test point: Flow graph display
Expected: Exhale volume within 10% of set tidal volume

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

Black screen on display

Screen appears completely black; unit may be reported as not booting or display defective

Ranked causes

1. LCD backlight or inverter failure (common)
2. Defective LCD display (rare)

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

Blower pressure branch pneumatic leak caution

Air escapes from blower pressure sensing tube or exhalation valve control line; exhalation valve cannot close fully; negative flow measurement observed on display

Ranked causes

1. Barbed connector leak behind front panel luer of exhalation valve control line (occasional)
2. Small barb of blower pressure connection tee leak (occasional)

First check

Set up ventilator and patient circuit

Test point: Per Section 3.4.1
Expected: Ventilator operational and patient circuit connected

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

Buzzer is audibly too low in volume caution

Alarm volume insufficient; buzzer output is weak or inaudible during alarms

Ranked causes

1. Alarm Volume level is not adequate in options menu (common)
2. Defective Interface Board (occasional)

First check

Check Alarm Volume setting

Test point: Options menu Alarm Volume control
Expected: Volume slider set to adequate level; alarm sounds audible

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

Demand valve leakage or fails VVT caution

Device leaks oxygen flow or fails to shut off with back pressure; may fail VVT when reinstalled

Ranked causes

1. Demand valve positioned ahead of pneumatic unit O2 intake port due to flexible tubing loss of flexibility (occasional)
2. Two versions of demand valve with different actuation requirements (unknown)

First check

Connect O2 to demand valve DISS fitting and apply pressure

Test point: DISS fitting on demand valve
Expected: O2 flows when manual button actuated; no flow when button released psi

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

Error code 316 found in error log caution

Technical log contains error code 316; user likely held key or control knob for extended duration

Ranked causes

1. User pressed key or control knob for more than 5 seconds (common)
2. Keypad is defective or intermittent (occasional)

First check

Review error log for code 316 frequency

Test point: Technical log file (error.log)
Expected: Code 316 absent or infrequent after user instruction

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

Error Code 359 in technical log; O2 system out of calibration patient safety

Error code 359 logged; O2 mixer started in extreme 21% position during last power-up or system out of calibration

Ranked causes

1. Mixer started in extreme 21% position (common)
2. O2 system out of calibration (occasional)

First check

Inspect stepper motor and microswitch cam position

Test point: Mixer stepper motor and microswitch cam
Expected: Microswitch cam positioned in mid-range position

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

Fails VVT, O2 Pressure Switch on 100% patient safety

VVT O2 pressure switch test fails with 100% reading; O2 supply pressure insufficient or switch defective

Ranked causes

1. O2 supply pressure is less than 40 psi (common)
2. O2 Pressure Switch out of acceptable range (occasional)

First check

Measure O2 supply pressure at input

Test point: O2 inlet connection to unit
Expected: Pressure reads 40 psi or greater throughout VVT, >= 40 psi

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

Fails VVT, Solenoid failure; Error code 330 in technical log patient safety

VVT test fails on solenoid check; error code 330 logged; solenoid valves stuck or defective

Ranked causes

1. Defective contact on Main Pneumatic connector (common)
2. Defective Pneumatic Unit (occasional)

First check

Inspect Main Pneumatic connector contacts

Test point: Main Pneumatic connector pins and sockets
Expected: All contacts clean, shiny, and fully engaged with low resistance

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

Flow offset on graph with different circuits; Fails OVT, Patient Circuit Failed patient safety

Flow offset persists across multiple patient circuits; patient circuit malfunction or internal tubing contamination

Ranked causes

1. Internal tubing is contaminated with fluid (common)
2. Missing or non-functioning one-way valve in patient circuit (occasional)

First check

Disconnect patient circuit and manually inspect tubing

Test point: Internal sensor tubing
Expected: No fluid present in internal tubing; clear and dry

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

Front LED doesn't light or is intermittent caution

Front panel LED indicator fails to illuminate or flickers intermittently during operation

Ranked causes

1. Conductive coating shorting LED leads (common)
2. Defective keypad (occasional)

First check

Visually inspect inside front enclosure for conductive coating

Test point: LED assembly area and surrounding enclosure
Expected: No conductive residue on LED leads or surrounding components

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

Leakage at Demand Valve outlet; O2% higher than 21% at 21% setting only with high pressure O2 patient safety

O2 concentration reads above 21% when set to 21%; demand valve entrains O2 when high pressure supplied

Ranked causes

1. Leakage at Demand Valve outlet (silicone) connection (common)
2. Demand Valve is entraining O2 (occasional)

First check

Measure O2% output with unit set to 21% and high pressure O2 supplied

Test point: O2 output sensor
Expected: O2% reads exactly 21.0% ±2% when set to 21%, ±2%

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

No blower pressure or turbine doesn't turn; Error Codes 345, 347 in technical log patient safety

Blower fails to generate pressure; turbine rotor does not rotate; error codes 345 and 347 logged

Ranked causes

1. Defective Electronic Module (common)
2. Defective Turbine (occasional)

First check

Verify Electronic Module output control signal to blower

Test point: Blower control signal at Electronic Module
Expected: Control signal present and varying during operation

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

O2 microswitch malfunction or misalignment caution

O2 microswitch does not change state properly when actuated by cam; fails closed or open conditions

Ranked causes

1. Microswitch actuator not properly positioned on cam or switch defective (unknown)
2. Stepper motor shaft binding or misalignment preventing proper cam rotation (unknown)

First check

Connect ohmmeter to microswitch and rotate shaft to end position

Test point: Pins 7 & 8 in PU main connector
Expected: Switch in open state at end position on cam

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

Pressure switch malfunction or incorrect reading caution

O2 pressure switch does not open or close properly; fails to detect pressure conditions

Ranked causes

1. Pressure switch not properly connected or defective (unknown)
2. Two versions with different specifications and pin configurations (unknown)

First check

Connect ohmmeter to pressure switch terminals per type and measure state

Test point: Pins 1 & 2 (silver type) or rear tabs (brass type)
Expected: Switch normally open (no O2); closes with high pressure O2 present

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

Unit displays Call Service/Battery Disconnect or Battery Damaged error patient safety

Error alarm indicates battery connection or function problem; charging LED lights with AC power

Ranked causes

1. Power Pack fuse is blown (common)
2. Battery capacity is inadequate; Fails VVT, Battery check (occasional)

First check

Inspect Power Pack fuse for rupture

Test point: Power Pack fuse element
Expected: Fuse element intact with continuity

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

Unit displays Patient Circuit Failed alarm during normal operation patient safety

Patient Circuit Failed alarm displays during normal ventilation; sensing line contaminated or one-way valve failed

Ranked causes

1. Sensing lines of patient circuit partially contaminated with fluid (common)
2. Pressure graph waveform is noisy from contamination (occasional)

First check

Inspect patient circuit sensing tubes for fluid or debris

Test point: Patient circuit sensing line inlets at front panel
Expected: Sensing tubes clean, dry, and clear

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

Unit displays temperature error; Error Code 304 in technical log caution

Temperature error alarm displays; error code 304 logged; cooling fan issue suspected

Ranked causes

1. Cooling fan disconnected or defective connector contact (common)
2. Cabling interfering with cooling fan (occasional)

First check

Inspect cooling fan connector

Test point: Cooling fan connector J
Expected: Connector fully seated with no corrosion; contact resistance low

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

Unit does not power up on AC power high voltage

Unit fails to power on when AC power is supplied; no response to power switch

Ranked causes

1. No continuity through power switch terminals (common)
2. Defective Electronic Module (occasional)

First check

Verify power switch continuity

Test point: Power switch terminals
Expected: Continuity present across switch terminals when in ON position

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

Unit powered off without user intervention

Unit unexpectedly powers down during operation; AC power lost or battery depleted

Ranked causes

1. AC fuse blown or discharged battery (common)
2. Unit running on battery with AC power disconnected (occasional)

First check

Review technical log for AC disconnect events

Test point: Event log file
Expected: No AC power disconnect entries during operation

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

Unit powers off when power switch is released

Power switch does not latch into the ON position; unit immediately loses power

Ranked causes

1. Gasket still present in switch body (common)
2. Defective On/Off switch (occasional)

First check

Inspect power switch body for gasket material

Test point: Power switch
Expected: No gasket present in switch body

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

Unit powers up but does not boot up

Green LED lights but unit fails to complete boot sequence; stuck during startup

Ranked causes

1. Wrong software revision installed or installation interrupted (common)
2. Defective Electronic Module (occasional)

First check

Verify software revision via technical log

Test point: Technical log files (error.log, events.log)
Expected: Current released software revision installed

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

100% O2 suction mode activation patient safety

Verify 100% O2 button triggers green pop-up, FiO2 elevates to 100%, and 2-minute alarm silence timer starts

Ranked causes

1. Front panel 100% O2 button malfunction or O2 delivery system failure (unknown)

First check

Green pop-up appears next to FiO2 field

Test point: FiO2 field display area
Expected: Green pop-up window visible

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

Apnea alarm detection and recovery patient safety

Verify apnea alarm triggers after 20-25 seconds at low rate, mode changes to blinking APNEA, and unit recovers on patient triggers after first minute

Ranked causes

1. Apnea detection sensor failure or alarm timer logic malfunction (unknown)

First check

Set ventilator rate to 2 bpm

Test point: Rate setting field
Expected: 2 bpm

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

Charge LED doesn't light with AC power cord plugged in high voltage

Battery Charge indicator LED fails to illuminate when AC power connected; charging circuit issue

Ranked causes

1. AC Fuse blown (common)

First check

Inspect AC fuse elements

Test point: AC fuse cartridges
Expected: Fuse element intact with continuity across terminals

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

Charge LED lights with AC power cord plugged in but battery remains discharged

Charge indicator LED illuminates but battery does not charge; battery depleted despite powered charger

Ranked causes

1. Battery is discharged (common)

First check

Monitor battery voltage during charging

Test point: Battery voltage at internal terminals
Expected: Battery voltage increases steadily during 8-hour charge cycle

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

Control knob feels loose or worn out caution

Control knob has excessive play or exhibits wear in mechanical response

Ranked causes

1. Encoder mounting shaft nut is loose (common)

First check

Inspect encoder shaft nut tightness

Test point: Encoder mounting shaft
Expected: Shaft nut firmly secured with no play in knob

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

Cursor moves without touching control knob caution

On-screen cursor or selection indicator moves without user input on the control knob

Ranked causes

1. Defective encoder (common)

First check

Monitor cursor movement without touching knob

Test point: Control knob encoder output
Expected: No cursor movement without physical knob input

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

Defective O2 sensor; Error Code 307 in technical log patient safety

Error code 307 logged; O2 sensor reading out of range or non-responsive

Ranked causes

1. Defective O2 sensor (common)

First check

Test O2 sensor response to known O2 concentrations

Test point: O2 sensor output signal
Expected: Sensor output varies linearly with O2 concentration; range 0-25%

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

Display image is upside-down, reversed, monocolored, fuzzy, etc.

LCD display shows distorted, inverted, or incorrect image; Screen Capture image is correct

Ranked causes

1. LCD connector is partially dislodged (common)

First check

Visually inspect LCD connector at display module

Test point: LCD connector J1
Expected: Connector fully seated with retaining bracket locked

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

Display is dim or flickers

LCD display shows reduced brightness or intermittent flickering during operation

Ranked causes

1. Defective LCD Display or Inverter Board (common)

First check

Test display brightness and flicker frequency

Test point: LCD display panel
Expected: Steady bright image with no flicker or dimming

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

Erratic O2 control patient safety

FiO2 setpoint control is unstable or fails to stabilize at targeted O2 mix value

Ranked causes

1. Unstable minute volume caused by auto-triggering (common)

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

Error Code 360 found in technical log; Sensors Disconnect alarm caution

Error code 360 logged; Sensors Disconnect alarm generated; unit passes VVT and Functional Tests

Ranked causes

1. Ventilator settings not optimized for patient or connecting interface (common)

First check

Review ventilator settings and patient interface configuration

Test point: Operating parameters and patient circuit type
Expected: Settings matched to patient category and circuit type; no alarm after rerun

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

Fails calibration: Calibrate Flow Sensor step

Unit cannot complete the Calibrate Flow Sensor calibration procedure

Ranked causes

1. O2 mixer set to 100% O2 position (common)

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

Fails O2 Calibration; Error Code 375 in technical log patient safety

O2 system calibration test fails; error code 375 indicates O2 sensor range inadequate

Ranked causes

1. O2 sensor range is inadequate (common)

First check

Test O2 sensor response across full operating range

Test point: O2 sensor output signal
Expected: Sensor output spans full range 0-25% O2 concentration

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

Fails VVT, Blower or Patient Pressure; PIP reaches <65 cmH2O during VVT patient safety

VVT shows insufficient peak inspiratory pressure; unit out of calibration or hardware fault

Ranked causes

1. Unit out of calibration (common)

First check

Run VVT with baseline calibration

Test point: Pressure measurement during VVT
Expected: PIP reaches minimum 65 cmH2O during test

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

Fails VVT, Blower or Patient Pressure; PIP reaches <65 cmH2O when calibrated patient safety

Even after calibration, peak inspiratory pressure insufficient; hardware fault suspected

Ranked causes

1. Outlet Muffler broken and leaking (common)

First check

Visually inspect outlet muffler for cracks or damage

Test point: Ventilator outlet muffler housing
Expected: Muffler intact with no visible cracks or leaks

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

Fails VVT, Flow Zeroing right after Flow Performance patient safety

VVT test fails on Flow Zeroing step immediately after Flow Performance check; zeroing/purge issue

Ranked causes

1. Zeroing/ Purge Board disconnected (common)

First check

Inspect Zeroing/Purge Board connector seating

Test point: Zeroing/Purge Board connector at Main Board
Expected: Board fully seated and retaining mechanism engaged

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

FiO2 return to baseline after 100% O2 timeout patient safety

Verify FiO2 setting and delivery return to 21% one minute after 2-minute alarm silence timer expires

Ranked causes

1. 100% O2 mode timeout logic failure or O2 control system malfunction (unknown)

First check

FiO2 return to 21% after timeout

Test point: FiO2 display and delivery measurement
Expected: 21%

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

Flow sensor leak VVT failure with no actual leak patient safety

Unit reports flow sensor leak failure during VVT testing but no pneumatic leak is present; operator suspects false alarm

Ranked causes

1. Electronic module fault detecting non-existent leak (occasional)

First check

Set up ventilator and patient circuit per Section 6.2.4

Test point: VVT setup
Expected: Ventilator and patient circuit properly configured

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

Flow sensor leakage in patient circuit caution

Perceptible leakage detected in patient circuit pneumatic path; oxygen escaping from tubing connections or components

Ranked causes

1. Leak at one of approximately 50 tubing connection points or component connections (common)

High pressure alarm threshold validation patient safety

Verify high pressure alarm triggers at set threshold and can be adjusted in Alarm Settings

Ranked causes

1. High pressure alarm sensor failure or threshold circuitry malfunction (unknown)

First check

Access Alarm Settings and Pressure group

Test point: Main Menu > Alarm Settings > Pressure group
Expected: Pressure group highlighted

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

Inhale tidal volume accuracy verification

Verification that inhale VT measurement is accurate using calibration manometer and test lung

Ranked causes

1. Pressure calibration verified with test lung (common)

First check

Measure peak inspiratory pressure (PIP) at 70+ kg default settings

Test point: Pressure display or external manometer
Expected: Approximately 34 cmH2O, ±1 cmH2O
Tools: Certified manometer, VersaMed 2-liter test lung P/N 910V0005-01

Internal O2 measurement verification needed

Validate O2 sensor reads correct values at different FiO2 settings (21%, 60%, 100%) across patient weights

Ranked causes

1. O2 sensor calibration or accuracy drift (unknown)

First check

View current O2 measurement value

Test point: Alarm Settings, O2 value field (blue)
Expected: O2 value displayed for current FiO2 setting

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

Low pressure during calibration or VVT patient safety

Calibration or Volume Verification Test (VVT) shows pressures lower than normal, indicating power source issue

Ranked causes

1. Ventilator running on battery power instead of AC mains (common)

First check

Verify AC power connection

Test point: AC power inlet and indicator light
Expected: AC power connected and power indicator illuminated

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

Need Cal alarm after power up; Error Code 306 in technical log patient safety

Calibration required alarm displays; error code 306 indicates O2 system is out of calibration

Ranked causes

1. O2 system out of calibration (common)

First check

Run O2 system calibration procedure

Test point: O2 sensor and control system
Expected: Calibration completes successfully; alarm clears

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

Negative (-) flow sensor port leak isolation

Diagnostic procedure to isolate leaks in the negative flow sensor branch

Ranked causes

1. Leak in negative flow sensor branch (unknown)

First check

Occlude negative flow sensor port

Test point: Negative flow sensor port tube
Expected: Flow graph trace goes negative or stays in negative range

Negative flow port and patient pressure branch leak caution

Leak in shared negative flow and patient pressure tubing system with multiple connection junctions; requires partial disassembly for isolation

Ranked causes

1. Leak at tubing junctions or connections in negative/patient pressure branch (occasional)

First check

Disassemble and reconfigure unit for testing

Test point: Electronic module positioned for tube access
Expected: Module configured per Figure 8-7 with tubing reconnected to external fittings

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

Negative flow port pneumatic leak caution

Leak in left-side (negative) flow sensing tube; flow graph trace goes above baseline; leftmost metal male locking luer connector affected

Ranked causes

1. Leak in negative flow port tubing or connectors (common)

First check

Set up ventilator and patient circuit

Test point: Per Section 6.2.4 page 90
Expected: Ventilator and circuit operational

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

O2% higher than 21% at 21% setting only when high pressure O2 not supplied patient safety

O2 concentration measures above 21% when set to 21%; issue only present without high pressure O2

Ranked causes

1. O2 system out of calibration at 21% (common)

First check

Measure O2% with unit at 21% setting and normal room air O2 only

Test point: O2 output sensor
Expected: O2% reads 21.0% ±2%, ±2%

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

Patient Circuit connections detect anomaly; Fails VVT, Flow sensor leak patient safety

VVT detects flow sensor malfunction; patient circuit connections or Electronic Module defective

Ranked causes

1. Defective Electronic Module (common)

First check

Verify patient circuit connections are secure

Test point: Patient circuit connectors at front panel
Expected: All connectors fully seated and locked

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

Patient disconnect alarm detection patient safety

Verify alarm and indicator response when test lung and Rp20 resistor disconnected from patient circuit

Ranked causes

1. Patient disconnect sensor failure or alarm output malfunction (unknown)

First check

Disconnect test lung and Rp20 resistor

Test point: Patient circuit connection point
Expected: Components removed from patient circuit

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

Patient disconnect detection during 100% O2 mode patient safety

Verify alarm and indicator behavior when test lung and Rp20 resistor disconnected during first 2 minutes and after timer expires

Ranked causes

1. Patient disconnect sensor failure or alarm circuitry malfunction (unknown)

First check

Patient disconnect alarm during first 2 minutes

Test point: Disconnect test lung and Rp20 resistor
Expected: Alarm sounds once; red Pat disc indicator appears; Low press indicator may appear

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

Pneumatic leak at internal tubing; Fails VVT, Flow sensor leak patient safety

VVT detects pneumatic leak in internal tubing; flow sensor measurement compromised

Ranked causes

1. Internal tubing leak identified during testing (common)

First check

Perform internal tubing leak location procedure

Test point: Internal pneumatic pathways (see Section 8.2.5)
Expected: No fluid leakage; all tubing connections intact

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

Pneumatic leak at sensing tubes connection patient safety

VVT detects pneumatic leak at patient circuit sensing tube connections; Flow sensor leak suspected

Ranked causes

1. Patient Circuit connections loose or defective (common)

First check

Inspect all sensing tube connections at front panel

Test point: Patient circuit sensing tube connectors
Expected: All connections finger-tight and secure with no audible hiss

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

Positive (+) flow sensor port leak isolation

Diagnostic procedure to isolate leaks in the positive flow sensor branch

Ranked causes

1. Leak in positive flow sensor branch (unknown)

First check

Occlude positive flow sensor port sensing tube

Test point: Positive flow sensor port tube
Expected: Flow graph trace goes positive or hugs baseline; remains in positive region even during ventilation

Positive flow port pneumatic leak caution

Leak in right-side (positive) flow sensing tube; flow graph trace goes below baseline; female locking luer connector affected

Ranked causes

1. Leak in positive flow port tubing or connectors (common)

First check

Set up ventilator and patient circuit

Test point: Per Section 6.2.4 page 90
Expected: Ventilator and circuit operational

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

Sensor disconnect alarm detection patient safety

Verify alarm and indicator response when patient circuit flow sensor connectors disconnected from ventilator front panel

Ranked causes

1. Flow sensor connector failure or alarm output malfunction (unknown)

First check

Disconnect flow sensor connectors

Test point: Two clear lines at lower left of ventilator front panel
Expected: Connectors removed

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

More symptoms

Service Notice! Alarm after power up; Error Codes 330, 333, 345, 347, 359
Slow rise or decay of pressure on graph and PIP bar
Tube disconnect alarm detection
Turbine is noisy; Unit appears to pressurize normally
Unit blows AC fuse immediately upon power up
Unit continues to function but displays Low Battery or Empty Battery alarm
Unit doesn't boot up on battery power
Unit power up sequence is normal but the display is black
Unit powers on only while holding switch button
Unit powers up but restarts over and over again
Unit won't pass OVT; Flow offset on graph
Unstable O2 control and minute volume
User interface timeout behavior

13 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`1`	Error logged during operation	Power surge, power dropout, or defective Electronic Module	warning
`304`	Temperature error detected	Cooling fan disconnected, defective connector, or cable interference	error
`306`	O2 system requires calibration	O2 system detected out of acceptable operating range	warning
`307`	O2 sensor malfunction	O2 sensor reading outside acceptable range or unresponsive	error
`316`	Keypad input held too long	User pressed and held key or control knob for more than 5 seconds	info
`330`	Solenoid valve malfunction detected	Main Pneumatic connector loose, defective solenoid contact, or defective Pneumatic Unit	error
`333`	Pneumatic system malfunction	Main Pneumatic connector disconnected or defective pneumatic component	error
`345`	Blower or pressure system failure	No blower pressure output, turbine not rotating, or Electronic Module defect	critical
`347`	Turbine or blower control failure	Turbine not responding to control signals or Electronic Module defective	critical
`359`	O2 mixer stepper motor position error or O2 system out of calibration	Mixer started in extreme 21% position or O2 system calibration drift	error
`360`	Sensor disconnect or sensitivity issue detected	Sensor signal loss, contamination, or ventilator settings not optimized for interface	warning
`375`	O2 sensor calibration failure	O2 sensor range inadequate or sensor malfunction during calibration	error

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

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