Patient monitors · Propaq family

Hill-Rom Propaq Encore: troubleshooting and error codes

The ServiceForge knowledge base holds 95 documented symptoms for the Hill-Rom Propaq Encore, with 118 ranked causes, 194 diagnostic checks with test points and expected values, and 30 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Battery does not hold charge

Monitor battery voltage drops rapidly when AC/DC power disconnected; unable to maintain operation on battery alone

Ranked causes

1. Battery aged or defective (common)
2. Battery charging circuit fault (occasional)

First check

Battery charge test after AC adapter recharge

Test point: Monitor: battery voltage after 8-12 hour charge period
Expected: Battery maintains voltage and monitor operates for specified runtime on battery alone

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

Button does not respond or sticks caution

One or more physical buttons on monitor do not respond to press or remain stuck in pressed position

Ranked causes

1. Button mechanism stuck or debris accumulated (occasional)
2. Button switch contact failure (rare)

First check

Button function response verification

Test point: All front-panel buttons: FREEZE/UNFREEZE, SETUP, ALARMS, SUSPEND, LIMITS, NEXT, MAIN MENU, NIBP START/STOP
Expected: Each button generates expected menu/display change per button sequence table

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Calibration: Propaq Encore monitor

Perform factory calibration when monitor performance is questioned or as indicated in Section 1 maintenance schedule. Respiration, temperature, printer, and SpO2 options do not require calibration. Sidestream CO2 has no user-performable calibration.

Ranked causes

1. Routine calibration required per maintenance schedule (common)
2. Mainstream CO2 circuitry calibration needed (occasional)

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

Calibration: Recharger Supply high voltage

Adjustment of voltage regulators RP5, RP3, and RP1 on the recharger board to ensure correct battery charging voltage and overvoltage protection limits.

Ranked causes

1. Factory calibration or recalibration required (unknown)
2. RP3 misadjustment risk (rare)

First check

Verify Encore power switch is off

Test point: Power switch
Expected: OFF

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

CO2 pump failure (sidestream)

PUMP FAILURE, SERVICE REQUIRED message displayed (SCO2); sidestream CO2 measurement unavailable

Ranked causes

1. Sidestream pneumatic tubing kinked (common)
2. Pump failure on SSP board (common)

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

CO2 sensor temperature control failure (mainstream)

SENSOR FAILURE, HEATER message displayed; sensor temperature control hardware fault

Ranked causes

1. Sensor temperature control hardware failure (common)
2. MSP board fault (occasional)

First check

Determine if sensor or board is faulty

CO2 waveform absent (mainstream)

LACK OF WAVEFORM, SENSOR DISABLED message displayed; channel disabled due to no airway adapter output

Ranked causes

1. Airway adapter (cuvette) contamination (common)
2. Sensor light source failure (common)

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

CO2 waveform degraded (mainstream)

DEGRADED WAVEFORM, CHECK ADAPTER message displayed; airway adapter contaminated or light source failure

Ranked causes

1. Airway adapter (cuvette) contamination (common)
2. Sensor light source failure (common)

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

ECG lead disconnect not detected patient safety

Monitor fails to generate equipment alarm or FAULT message when single or multiple ECG leads are disconnected from simulator

Ranked causes

1. ECG lead detection circuit fault (rare)
2. Alarm software not functioning (occasional)

First check

Single ECG lead disconnect alarm generation

Test point: Monitor display and alarm indicators; disconnect LA lead
Expected: EQUIPMENT ALERT / MULTIPLE message displayed; ECG FAULT indicated; ALARM(S) OFF light flashes

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

ECG signal low or missing on oscilloscope display

ECG output voltage is not within expected range during calibration

Ranked causes

1. RP6 potentiometer incorrectly adjusted (common)
2. U55 short not properly connected (occasional)

First check

Verify RP6 baseline offset voltage

Test point: Analog board RP6, measured at Digital board TP4
Expected: 0V dc, ±0.1V
Tools: Oscilloscope (DC-coupled), reference to TP4

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

ECG waveform amplitude not correct

Displayed ECG peak-to-peak amplitude deviates from expected 10±1 mm with normal sinus rhythm simulator input

Ranked causes

1. ECG channel gain or front-end amplifier fault (occasional)
2. Patient simulator ECG output incorrect (occasional)

First check

Verify patient simulator ECG configuration

Test point: Patient simulator controls
Expected: ECG Size: 1 mV amplitude; ECG Rate: 80 bpm; Waveform: normal sinus rhythm

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

Expansion module rear panel reassembly and closure caution

Procedures for reassembling expansion module rear panel with proper gasket placement, torque specifications, and spacer management.

Ranked causes

1. Expansion module rear panel reassembly (common)
2. Improper spacer placement or gasket positioning (occasional)

First check

Verify all gaskets are positioned correctly

Test point: Rubber gaskets around rear panel perimeter
Expected: All gaskets in proper position shown in figure

4 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Expansion module rear panel removal and reinstallation caution

Procedures for opening and closing expansion module rear panel with gasket and connector care, including spacer management.

Ranked causes

1. Expansion module service or component replacement (unknown)
2. Gasket seal degradation or spacer loss (occasional)

First check

Verify all four rear panel fasteners are removed

Test point: Rear panel mounting screws
Expected: Four screws removed; spacers retained if present

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

Green LED charging indicator does not turn on when AC adapter connected

Green LED on monitor's right side panel fails to illuminate when AC power adapter is plugged in and switched on

Ranked causes

1. AC power adapter not switched on (common)
2. AC power adapter not supplying power (occasional)

First check

Verify AC power adapter power switch is on

Test point: AC power adapter power switch
Expected: Switch 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

Heart rate display incorrect

Monitor heart rate display does not match simulator setting or is outside tolerance band

Ranked causes

1. ECG signal processing or rate calculation error (occasional)
2. Patient simulator ECG rate incorrect (occasional)

First check

Patient simulator ECG rate setting

Test point: Patient simulator controls
Expected: ECG Rate: 80 bpm

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

Left side panel requires replacement caution

Procedures for removing and installing left side panel assembly with NIBP cuff hose connector and tubing.

Ranked causes

1. Left side panel damage or wear (unknown)
2. Adhesive gasket deterioration (occasional)

First check

Verify left side panel clamp is removed

Test point: Left side panel U-shaped clamp
Expected: Clamp fully removed from side panel

1 more check with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Monitor does not charge from DC power supply caution

Green LED charging indicator does not illuminate when DC power supply is connected and turned on

Ranked causes

1. Incorrect polarity of DC power supply connection (common)
2. DC power supply voltage out of operating range (occasional)

First check

Verify DC power supply polarity

Test point: DC input connector on monitor right side panel
Expected: RIBBED lead connected to (+); SMOOTH lead connected to (-)

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

No audio tone with QRS event

Soft beep tone does not sound with each detected QRS complex during normal ECG operation

Ranked causes

1. Audio output circuit or speaker fault (occasional)
2. Audio alarms disabled in software (common)

First check

Verify audible vital signs alarms enabled

Test point: Monitor menu: Audible vital signs alarm setting
Expected: Alarms enabled (ON)

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

Recharger board connector or cable failure

Recharger board cables P2, P3, P12, P14, P15 may be disconnected or faulty, preventing proper charging and NIBP function.

Ranked causes

1. Recharger board cables disconnected or loose (occasional)
2. Recharger board removal or installation error (occasional)

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

Respiration rate display incorrect

Monitor respiration rate display does not match simulator setting or is outside tolerance band

Ranked causes

1. Respiration signal processing or rate calculation error (occasional)
2. Patient simulator respiration rate incorrect (occasional)

First check

Patient simulator respiration rate setting

Test point: Patient simulator controls
Expected: Resp Rate: 40 br/m

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

Respiration waveform amplitude not correct

Displayed respiration peak-to-peak amplitude deviates from expected 12.5±1 mm

Ranked causes

1. Respiration channel gain or front-end amplifier fault (occasional)
2. Patient simulator respiration output incorrect (occasional)

First check

Verify patient simulator respiration configuration

Test point: Patient simulator controls
Expected: Resp Lead I, Baseline 1 KΩ, Rate 40 br/m, Amplitude 1.0Ω

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

Right side panel requires replacement caution

Procedures for removing and installing right side panel assembly which is sealed with adhesive gasket to rear chassis.

Ranked causes

1. Right side panel damage or wear (unknown)
2. Adhesive gasket deterioration or contamination (occasional)

First check

Verify right side panel clamps are removed

Test point: Side panel clamps
Expected: Two clamps removed from right side

1 more check with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Side panel installation and sealing caution

Procedures for installing side panels with adhesive gasket and securing with clamps to ensure proper sealing of rear chassis.

Ranked causes

1. New side panel installation required (common)
2. Improper side panel seating or clamp fit (occasional)

First check

Verify gasket material is completely removed from rear chassis

Test point: Rear chassis mounting surface
Expected: All old gasket material removed; clean surface visible

3 more checks with pass and fail actions, 9 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Analog board replacement needed high voltage

Analog board requires removal and replacement due to malfunction

Ranked causes

1. Analog board malfunction (unknown)

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

Analog board requires replacement caution

Analog board malfunction detected; entire monitor must be returned to Welch Allyn for service.

Ranked causes

1. Analog board internal failure (unknown)

First check

Verify cable to P6 routing

Test point: P6 connector on Analog board
Expected: Cable goes behind and below cable to P5, and over cable to P7

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

Battery does not charge

Green LED charging indicator on monitor right side panel does not illuminate and battery does not charge when ac power adapter is connected

Ranked causes

1. F1 fuse open or failed (common)

First check

Verify ac power adapter functioning properly

Test point: ac power adapter output
Expected: Adapter operating normally

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

Battery does not retain charge

Battery pack fails to hold charge during normal operation.

Ranked causes

1. Battery pack degraded or defective (common)

First check

Check battery pack capacity

Test point: battery pack
Expected: manufacturer specifications

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

Cables or hoses pinched during reassembly caution

Internal cables or hoses may be compressed or damaged when closing the monitor casing, potentially causing shorts or reduced airflow.

Ranked causes

1. Incorrect cable routing during reassembly (common)

First check

Verify cable P6 routing relative to P5 and P7

Test point: Analog board connectors P5, P6, P7
Expected: P6 behind/below P5 and over P7

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

Calibration: Display voltage adjustment high voltage

High voltage supply on recharger board requires adjustment to match display module label specification or optimize display contrast and brightness.

Ranked causes

1. Display voltage requires calibration following installation or display module replacement (common)

First check

Install display module and reconnect cables

Test point: Display module, front and rear chassis connectors
Expected: Display installed and all cables reconnected

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

Calibration: Display voltage adjustment high voltage

Adjust monitor display's high voltage supply on recharger board after display replacement or if contrast between illuminated and non-illuminated pixels affects readability

Ranked causes

1. Display voltage requires calibration after display change or contrast degradation (common)

First check

Install replacement display and reconnect all cables

Test point: Front and rear chassis connections
Expected: Display powered, equipment alert present

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

Calibration: EMI null adjustment

Adjustment of oscilloscope probe positions and potentiometers to null AC mains and high-frequency noise on analog and digital boards

Ranked causes

1. AC mains and high-frequency noise present on analog and digital boards (common)

First check

Connect oscilloscope reference lead and verify noise level

Test point: TP43 or TP1 on Analog board
Expected: ≤ 15mV peak-to-peak noise, ≤ 15mV
Tools: Oscilloscope

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

Calibration: Functional verification patient safety

Verify proper operation of Encore monitor and options following module-level repairs, calibration, or when questioning accuracy or safety of patient functions

Ranked causes

1. Software or hardware malfunction following repair or calibration (unknown)

First check

Perform power-up self-test

Test point: Monitor startup
Expected: Software testing successful, then hardware tests initiated

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

Calibration: Functional verification patient safety

Verify proper operation of Encore monitor and options after module-level repairs, calibration, or when accuracy or safety is questioned

Ranked causes

1. Module-level repairs or calibration performed (common)

First check

Perform power-up self-test

Test point: Monitor startup
Expected: Software integrity checked first, then hardware tests initiated

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

Calibration: Invasive Blood Pressure

Adjustment of IBP simulator inputs and potentiometer to calibrate pressure channel readings to 200 mmHg

Ranked causes

1. IBP channels require calibration to match simulator pressure readings (common)

First check

Connect IBP simulator and set initial pressure

Test point: P1 connector on Encore left side panel
Expected: Simulator connected and set to 0 mmHg

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

Calibration: MSP Board barometric pressure

MSP board (MCO2) barometric pressure/altimeter requires calibration adjustment to match local conditions. RP1 is a potentiometer for this adjustment.

Ranked causes

1. Barometric pressure reading out of specification (unknown)

First check

Display barometric pressure via service menu

Test point: SETUP > MORE > MORE > SERVICE > YES > CO2 TEST > MAIN TST
Expected: Within 3 mmHg of local barometric pressure

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

Calibration: MSP Board electromagnetic interference emissions

RP2 is a null adjustment potentiometer for reducing electromagnetic interference emissions. Adjustment procedure uses oscilloscope measurement at test point TP50.

Ranked causes

1. EMI emissions require nulling adjustment (unknown)

First check

Connect oscilloscope probe to test point

Test point: TP50 on MSP board
Expected: Probe tip connected; ground tip open

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

CO2 sensor calibration error (mainstream)

SENSOR FAILURE, CALIBRATION ERROR message displayed; sensor malfunction

Ranked causes

1. Sensor failure (common)

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

CO2 sensor calibration error (sidestream)

CALIBRATION ERROR-SERVICE REQUIRED message displayed (SCO2); bench measurement failure

Ranked causes

1. CO2 bench failure (common)

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

CO2 sensor EEPROM failure (mainstream)

SENSOR FAILURE - EEPROM message displayed; CO2 channel disabled until sensor cable disconnected

Ranked causes

1. Sensor EEPROM failure; typically checksum error (common)

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

CO2 sensor exhaust line occlusion (sidestream)

OCCLUSION-CHECK EXHAUST PORT/TUBING message displayed (SCO2); exhaust path blocked

Ranked causes

1. Exhaust port or tubing occlusion (common)

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

CO2 sensor motor drive failure (mainstream)

SENSOR FAILURE, MOTOR DRIVE message displayed; mainstream sensor motor drive hardware failed

Ranked causes

1. Mainstream sensor motor drive hardware failure (common)

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

CO2 sensor motor failure (sidestream)

MOTOR FAILURE-SERVICE REQUIRED message displayed (SCO2); bench motor drive failure

Ranked causes

1. Motor drive failure in CO2 bench (common)

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

CO2 waveform absent (sidestream)

LACK OF WAVEFORM-SERVICE REQUIRED message displayed (SCO2); no CO2 measurement data

Ranked causes

1. CO2 measurement chamber contamination or light source failure (common)

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

CO2 waveform degraded (sidestream)

DEGRADED WAVEFORM-SERVICE REQUIRED message displayed (SCO2); measurement chamber or light source failure

Ranked causes

1. CO2 measurement chamber contamination or light source failure (common)

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

DEFIB SYNC output signal out of specification high voltage

DEFIB SYNC connector pulse does not meet voltage and width specifications

Ranked causes

1. DEFIB SYNC output circuit fault (unknown)

First check

Measure DEFIB SYNC output pulse

Test point: DEFIB SYNC connector
Expected: 5 V p-p pulse with 100 ±5 ms width, ±5 ms width
Tools: Oscilloscope at 1 V/div

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

Defibrillator sync markers not appearing on ECG high voltage

Sync markers do not display on ECG waveform during defibrillator sync operation

Ranked causes

1. Defibrillator sync setup or configuration error (occasional)

First check

Verify sync markers displayed on ECG during defibrillator connection

Test point: Monitor ECG display
Expected: Sync markers visible on ECG waveform

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

Dielectric breakdown detected during high-voltage test high voltage

Tester indicates dielectric breakdown when 4000V ac rms is applied between ECG leads and DC input connector

Ranked causes

1. Internal sheet insulation barriers not properly installed (unknown)

First check

Apply high-voltage test between all ECG leads and DC input connector

Test point: All ECG leads on patient cable connected together; DC input connector all pins connected together
Expected: No dielectric breakdown V ac rms, N/A
Tools: High-voltage tester

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

Digital board malfunction patient safety

Monitor requires service for Digital board issues; board cannot be field-repaired

Ranked causes

1. Digital board failure (unknown)

First check

Visual inspection of Digital board

Test point: Button contact surfaces on underside
Expected: Clean and oil-free surfaces

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

Display contrast inadequate high voltage

Lack of contrast between illuminated and non-illuminated pixels affects display readability following display module change.

Ranked causes

1. Display voltage not optimized for contrast after display module replacement (common)

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

Display pixels missing during pixel test

Display test reveals missing or defective pixels on LCD screen

Ranked causes

1. LCD display defect (rare)

First check

Run pixel test on display

Test point: Monitor display screen
Expected: No missing pixels visible during three CYCLE iterations

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

ECG signal amplitude out of specification high voltage

ECG signal measured at X1000 connector does not meet amplitude specification

Ranked causes

1. ECG connector or signal path fault (unknown)

First check

Measure ECG signal amplitude at X1000 connector

Test point: ECG X1000 connector
Expected: 1 V ±100 mV baseline to peak of R-wave, ±100 mV
Tools: Oscilloscope set to 0.2 s/div and 0.5 V/div

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

EMI null adjustment pre-check

Verification of noise level before proceeding with EMI null adjustment procedure

Ranked causes

1. Initial noise level must be verified to establish baseline (common)

First check

Connect oscilloscope and measure peak-to-peak noise

Test point: TP43 or TP1 on Analog board
Expected: ≤ 15mV peak-to-peak, ≤ 15mV
Tools: Oscilloscope

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

Equipment alarm does not occur when Nellcor sensor disconnected patient safety

No equipment alarm generated when SpO2 sensor disconnected from monitor

Ranked causes

1. SpO2 fault detection circuit malfunction (rare)

First check

Confirm equipment alarm when sensor disconnected

Test point: Monitor display
Expected: Equipment alarm and acknowledgment prompt

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

Fasteners torqued incorrectly caution

Six screws securing front chassis to rear chassis are over-torqued or under-torqued, potentially causing casing stress, misalignment, or insufficient securement.

Ranked causes

1. Fasteners not torqued to specification (common)

First check

Torque six casing screws to specification

Test point: All six fasteners securing front to rear chassis
Expected: 6.65 in-lbs to 7.35 in-lbs (0.75 N-m to 0.83 N-m), 6.65 to 7.35 in-lbs
Tools: Calibrated torque wrench

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

Functional verification fails patient safety

Monitor does not pass functional verification or accuracy/safety is questioned

Ranked causes

1. Monitor out of specification (unknown)

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

Green LED charging indicator does not illuminate and battery does not charge

The green LED on the monitor's right side panel does not light up, and the monitor battery fails to charge even when the AC power adapter is functioning properly.

Ranked causes

1. Fuse F1 open or failed (common)

First check

Visually inspect fuse F1 for continuity or visible damage

Test point: F1 fuse location
Expected: Fuse element intact and continuous

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

IBP mean pressure reading out of range at 0 mmHg patient safety

Mean pressure does not display as 0 mmHg ±1 mmHg when simulator set to 0 mmHg

Ranked causes

1. IBP transducer not properly zeroed (common)

First check

Verify mean pressure at 0 mmHg after settling

Test point: IBP P1 mean pressure display
Expected: 0 mmHg ±1 mmHg, ±1 mmHg

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

IBP mean pressure reading out of range at 200 mmHg patient safety

Mean pressure does not display as 200 mmHg ±2 mmHg when simulator set to 200 mmHg

Ranked causes

1. IBP signal conditioning or transducer linearity fault (occasional)

First check

Verify mean pressure at 200 mmHg after settling

Test point: IBP P1 mean pressure display
Expected: 200 mmHg ±2 mmHg, ±2 mmHg

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

IBP waveform noise exceeds specification patient safety

Invasive blood pressure waveform display shows noise level greater than 3 mm

Ranked causes

1. IBP transducer not zeroed or pressure signal noise (common)

First check

Measure IBP waveform noise at 0 mmHg

Test point: IBP P1 waveform display
Expected: Noise level ≤3 mm

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

Locking clips not secured caution

P10 and P11 locking clips on the monitor chassis are not fully engaged or secured, potentially allowing the casing to separate during operation.

Ranked causes

1. Locking clips not fully engaged during reassembly (common)

First check

Verify P10 locking clip is secure

Test point: Front chassis P10 locking clip
Expected: Clip fully engaged and locked

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

More symptoms

Masimo SpO2 data not displaying
Masimo SpO2 saturation reading out of specification
Monitor displays error messages on power-up
Monitor does not pass Functional Verification
Monitor does not power on but battery charging indicator lights
Monitor does not power on but battery charging indicator lights
Monitor time or date display incorrect
Nellcor SpO2 data not displaying
Nellcor SpO2 saturation reading out of specification
Neonatal cuff does not inflate to specification
NIBP calibration reading out of specification at 250 mmHg
NIBP leakage exceeds specification during pump test
NIBP measurements inaccurate or system not functioning
NIBP pressure readings exceed tolerance at calibration points
NIBP readings out of specification at 0 mmHg
NIBP system fault
O-ring gasket pinched during SpO2 module closure
P1 FAULT transducer not detected message not appearing
Pacer indicator not displaying
Pressure transducer disconnected
Printer does not output data strip on snapshot
Printer does not start continuous printing
Printer does not stop when door opened
Rear chassis O-ring gasket missing or displaced
Reinstall MSP/SpO2 circuit boards
Replace MSP/SpO2 circuit boards
Replace SpO2 circuit boards
Safety check: Leakage current and dielectric strength
Safety precautions during calibration
Settings and time lost after power-on
SpO2 module does not open
Suspected faulty cable
Temperature channel out of calibration
Temperature probe reading out of specification for YSI 400 series
Temperature probe reading out of specification for YSI 700 series

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

Error codes

Code	Meaning	Trigger	Severity
`ALARM light flashing`	Active patient alarm condition detected and alarm tone sounding	Patient vital sign parameter exceeds high alarm limit or falls below low alarm limit	warning
`ALARM(S) OFF`	One or more alarm threshold limits have been disabled or all vital signs alarms suspended	User sets alarm limit to OFF via menu; user suspends all audible alarms via SERVICE menu	warning
`CALIBRATION ERROR-SERVICE REQUIRED`	CO2 bench failure has occurred	During CO2 measurement (SCO2)	error
`CALIBRATION ERROR, TEMP DISABLED`	Temperature sensor out of calibration	Temperature circuitry fails calibration check	error
`CALIBRATION ERROR, TEMP DISABLED`	Temperature circuitry out of calibration	Monitor detects temperature measurement out of calibration	error
`CUFF FAULT: NIBP DISABLED, SERVICE REQUIRED`	Single fault in NIBP system	NIBP measurement system detects malfunction	error
`CUFF FAULT: NIBP DISABLED, SERVICE REQUIRED`	Non-invasive blood pressure system malfunction	Single fault detected in NIBP circuitry	error
`DEGRADED WAVEFORM, CHECK ADAPTER - (MCO2)`	CO2 waveform signal degraded or absent	Poor signal quality from sensor or adapter	warning
`DEGRADED WAVEFORM, CHECK ADAPTER - (MCO2)`	CO2 waveform degraded or weak	Reduced signal quality from sensor	warning
`DEGRADED WAVEFORM-SERVICE REQUIRED`	Possible contamination or light source failure in CO2 chamber or SSP Board failure	During CO2 measurement (SCO2)	warning
`ECG FAULT`	Electrocardiogram signal acquisition or processing error	Loss of ECG signal from one or more leads; inability to detect R-wave or process ECG channel	error
`EQUIPMENT ALERT / MULTIPLE`	Multiple equipment faults or lead disconnections detected simultaneously	Loss of two or more ECG leads or simultaneous ECG and RESP signal loss	error
`EQUIPMENT ALERT - MULTIPLE LEAD FAIL`	Multiple ECG leads have failed or become disconnected	Detection of missing signals on two or more ECG lead channels	error
`LACK OF WAVEFORM, SENSOR DISABLED`	Airway adapter (cuvette) contaminated or light source in sensor faulty	During CO2 measurement (MCO2)	error
`LACK OF WAVEFORM, SENSOR DISABLED - (MCO2)`	No CO2 waveform detected, sensor disabled	No signal received from CO2 sensor	error
`LACK OF WAVEFORM-SERVICE REQUIRED`	Possible contamination or light source failure in CO2 chamber or SSP Board failure	During CO2 measurement (SCO2)	error
`MOTOR FAILURE-SERVICE REQUIRED`	Motor drive in CO2 bench has failed	During CO2 measurement (SCO2)	error
`OCCLUSION-CHECK EXHAUST PORT/TUBING`	Exhaust port or tubing occluded; repeated errors indicate pump failure on SSP board	During CO2 measurement (SCO2)	warning
`PROGRAM FAULT: SETTINGS LOST, TIME/DAY RESET`	Battery depleted; configuration memory lost	Battery voltage too low at power-up	warning
`PROGRAM FAULT: SETTINGS LOST, TIME/DAY RESET`	Drained battery causing loss of stored settings	Monitor powered on with depleted backup battery	warning
`PUMP FAILURE, SERVICE REQUIRED`	Sidestream pneumatic tubing kinked or pump failure on SSP board	During CO2 measurement (SCO2)	error
`RESP FAULT`	Respiration signal acquisition or processing error	Loss of respiration impedance signal; inability to detect respiration rate or process RESP channel	error
`SENSOR FAILURE, CALIBRATION ERROR`	Sensor failure has occurred	During CO2 measurement (MCO2)	error
`SENSOR FAILURE, CALIBRATION ERROR - (MCO2)`	Sensor calibration failure	Sensor calibration error detected	error
`SENSOR FAILURE - EEPROM - (MCO2)`	Sensor EEPROM failure detected (typically checksum error)	Sensor EEPROM checksum error or failure	error
`SENSOR FAILURE - EEPROM - (MCO2)`	CO2 sensor EEPROM memory error	EEPROM checksum error detected	error
`SENSOR FAILURE, HEATER - (MCO2)`	CO2 sensor temperature control hardware failure	Sensor temperature control circuit malfunction	error
`SENSOR FAILURE, HEATER - (MCO2)`	Sensor temperature control hardware failure	Sensor heater control circuit malfunction	error
`SENSOR FAILURE, MOTOR DRIVE - (MCO2)`	Mainstream sensor motor drive hardware failed	Motor drive circuit malfunction	error
`SENSOR FAILURE, MOTOR DRIVE - (MCO2)`	CO2 sensor motor drive hardware failure	Mainstream sensor motor drive malfunction	error

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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.