Test equipment MRI monitors · 3160 family

Invivo 3160: troubleshooting and error codes

The ServiceForge knowledge base holds 147 documented symptoms for the Invivo 3160, with 230 ranked causes, 347 diagnostic checks with test points and expected values, and 23 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Agents parameter failure or not working (with EtCO2)

CO2 measurement not functioning; no air flow from gas input port or occlusion detected

Ranked causes

1. Gas input tubing disconnected from water trap (common)
2. Water trap full or occluded (common)
3. Internal gas tubing disconnected or loose (occasional)
4. Agent Bench not operating properly (occasional)
5. WPU Electronics Assembly failure (occasional)
6. DCU assembly failure (occasional)

First check

Check water trap for proper inlet air flow

Test point: GAS Input port on water trap
Expected: A mild air vacuum is detected at the GAS Input port

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

ECG 5 Volt digital pulse not present or incorrect amplitude high voltage

Digital scope does not display positive 5V pulse train on ECG signal channel during bench testing

Ranked causes

1. Patient simulator not outputting ECG signal at 60 BPM (common)
2. TF0240 test fixture not connected to PA558A WPU gating port (common)
3. Scope probe not connected to correct signal pin (occasional)
4. Scope settings incorrect (occasional)
5. WPU gating source not set to ECG (occasional)

First check

Verify patient simulator ECG output at 60 BPM

Test point: medSim 300B display
Expected: 60 BPM flashing; ECG signal being output

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

NIBP parameter failure or not working patient safety

NIBP measurement not functioning; air not inflating or pressure readings not obtained

Ranked causes

1. NIBP cuff accessory disconnected or loose (common)
2. WPU Electronics Assembly failure (occasional)
3. NIBP Primary transducer calibration error (occasional)
4. NIBP Secondary transducer calibration error (occasional)
5. DCU assembly failure (occasional)

First check

Press NIBP START/STOP key to initiate manual NIBP reading

Test point: DCU NIBP START/STOP key control panel and Inflate port
Expected: A moderate stream of air exits the Inflate port. A flashing red NOT INFLATING error message is displayed in the DCU's NIBP icon

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

SPO2 20 millivolt analog signal not present or incorrect amplitude

Digital scope does not display 20 mV analog signal on SPO2 channel during bench testing

Ranked causes

1. Bapco pulse oximetry simulator not powered on or configured (common)
2. SPO2 sensor not connected or WSPO2 module not powered on (common)
3. Scope vertical scale not set to 20 mV/Div (occasional)
4. AS131 adapter not installed between scope and probe (occasional)
5. Scope probe connected to wrong signal pin (occasional)

First check

Power on Bapco and configure for pulse oximetry

Test point: Bapco controls and display
Expected: Bapco powered; PULSE OXIMETRY selected; SPO2 > 90%; heart rate 60-120 BPM

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

AS201 Power Adapter won't power up on facility line power high voltage

Power adapter does not illuminate DC OUTPUT indicator light when connected to facility AC power

Ranked causes

1. Facility power absent or out of tolerance (common)
2. AS201 DC OUTPUT indicator not green (internal fault) (common)
3. AS201 AC fuse(s) defective (occasional)
4. AS201 Power Adapter internal failure (occasional)

First check

Verify facility AC power availability and within tolerance

Test point: AC wall outlet
Expected: 90–264 VAC @ 47–63 Hz continuous
Tools: DMM

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

ECG parameter failure or not working patient safety

ECG transmitter module not communicating or transmitting data; status indicator displayed in red box with X

Ranked causes

1. WECG transmitter module battery voltage low (common)
2. DCU assembly failure (occasional)
3. WPU Electronics Assembly failure (occasional)
4. WECG transmitter module hardware failure (rare)

First check

Check WECG transmitter module battery voltage

Test point: WECG transmitter module battery terminals
Expected: > +3.3 Vdc
Tools: DMM

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

IBP 200 millivolt analog signal not present or incorrect amplitude high voltage

Digital scope does not display 200 mV analog signal on IBP channel during bench testing

Ranked causes

1. IBP cable not connected from simulator BP1 output to P1 input of Interface Unit (common)
2. Simulator BP settings not configured correctly (common)
3. Scope vertical scale not appropriate for 200 mV signal (occasional)
4. Scope probe connected to wrong signal pin (occasional)

First check

Verify P1 turned on and displayed on WPU display

Test point: WPU display
Expected: P1 indicator on and visible

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

Respiration 1 Volt analog signal not present or incorrect amplitude

Digital scope does not display 1V analog signal on respiration channel during bench testing

Ranked causes

1. 3160 SPO2 and RESP parameters not enabled (common)
2. Respiration sensor bellows not connected to WSPO2 module (common)
3. Respiration signal not being generated at correct rate (common)
4. Scope probe connected to wrong signal pin (occasional)

First check

Verify 3160 SPO2 and RESP parameters are enabled

Test point: 3160 system parameter settings
Expected: SPO2 parameter = ON; RESP parameter = ON

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

SPO2 parameter failure or not working patient safety

SPO2 transmitter module not communicating or transmitting data; status indicator displayed in red box with X

Ranked causes

1. WSPO2 transmitter module battery voltage low (common)
2. DCU assembly failure (occasional)
3. WPU Electronics Assembly failure (occasional)
4. WSPO2 transmitter module hardware failure (rare)

First check

Check WSPO2 transmitter module battery voltage

Test point: WSPO2 transmitter module battery terminals
Expected: > +3.3 Vdc
Tools: DMM

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

ECG 1 millivolt analog signal not present or incorrect amplitude high voltage

Digital scope does not display 1 mV analog signal on ECG channel during bench testing

Ranked causes

1. Scope vertical scale not set to lowest possible scale (common)
2. AS131 adapter not installed between scope and probe (common)
3. Scope probe connected to wrong signal pin (occasional)

First check

Verify scope vertical scale set to 2 mV/Div

Test point: Scope vertical scale control
Expected: Vertical scale 2 mV/Div (lowest possible)

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

ECG negative 5 Volt digital pulse not present or incorrect amplitude high voltage

Digital scope does not display negative -5V pulse train on ECG signal channel during bench testing

Ranked causes

1. Scope probe connected to wrong signal pin (common)
2. Scope baseline position not adjusted for negative signal display (occasional)
3. Gating source not set to ECG on DCU display (occasional)

First check

Verify scope probe connected to pin F on TF0240 with pin B as ground

Test point: TF0240 pin F (signal) and pin B (common)
Expected: Probe connected to pin F; ground connected to pin B

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

EtCO2 parameter failure or not working patient safety

Exhaled CO2 measurement not displayed or functional

Ranked causes

1. Water trap occluded or full (common)
2. Internal gas tubing disconnected or improperly seated (common)
3. WPU Electronics Assembly defective (occasional)

First check

Disconnect patient tubing from GAS Input port

Test point: Water trap GAS Input port
Expected: Tubing disconnected

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

ETCO2 reading out of expected range with calibration gas patient safety

Monitor ETCO2 reading does not fall within calculated tolerance range when 10% CO2 check gas is applied

Ranked causes

1. Barometric pressure not accounted for in expected value (common)
2. Check gas cylinder depleted or regulator malfunction (occasional)
3. Sensor calibration drift or sensor failure (occasional)

First check

Apply 9091A check gas to sample line input with air vented delivery system

Test point: Sample line input
Expected: Monitor detects ETCO2 and displays reading

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

IBP parameter failure or not working patient safety

Invasive blood pressure measurement not displayed or functional

Ranked causes

1. WPU IBP output voltage out of specification (common)
2. IBP fiber optic cable defective or disconnected (occasional)
3. PCU assembly or AS226 IBP assembly defective (occasional)

First check

Measure WPU IBP output voltage

Test point: PCU/DCU connector Pin 3 to Pin 4
Expected: +12 +0.5 Vdc, +/-0.5
Tools: DMM

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

Monitor internal cleaning and inspection required high voltage

Internal dust, debris, loose hardware, unseated cards, loose cables, or damaged EMI gaskets detected; affects cooling or electrical safety.

Ranked causes

1. Dust and debris accumulation inside monitor enclosure (common)
2. Loose or improperly seated hardware or components (occasional)
3. Damaged EMI gaskets affecting shielding (occasional)

First check

Turn monitor OFF and disconnect AS201 DC Input power before opening

Test point: Power switch and AS201 connector
Expected: Monitor powered off and disconnected from DC power source

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

O2 measurements not working patient safety

Oxygen sensor output not displayed or functional on monitor

Ranked causes

1. Waste gas exhaust not detected from O2 sensor block (common)
2. Internal connections to O2 sensor block faulty (common)
3. WPU Electronics Assembly defective (occasional)

First check

Inspect for waste gas exhaust from O2 sensor block

Test point: WPU rear panel O2 sensor block
Expected: Air flow is detected (minimal)

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

RESP parameter failure or not working patient safety

Respiration measurement not displayed or functional

Ranked causes

1. WSPO2 transmitter module battery low or depleted (common)
2. DCU assembly defective (occasional)
3. WSPO2 transmitter module communication lost or defective (occasional)

First check

Remove WSPO2 transmitter battery

Test point: WSPO2 transmitter module battery compartment
Expected: Battery removed safely

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

Respiration rate not displayed on WPU patient safety

Respiration option enabled, bellows tubing connected to WSPO2 module and bellows positioned on chest/stomach, but WPU does not display consistent respiration rate

Ranked causes

1. Respiration bellows not properly connected or positioned (common)
2. Respiration option not enabled in menu (occasional)
3. WSPO2 module or respiration sensor malfunction (occasional)

First check

Enable Respiration option in menu

Test point: SETUPS / PARAMETER SELECTION menu
Expected: RESPIRATION turned on

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

SPO2 2 Volt analog signal not present or incorrect amplitude

Digital scope does not display 2V analog signal on SPO2 2V channel during bench testing

Ranked causes

1. AS131 adapter not removed from scope (common)
2. Scope vertical scale not set to 1 V/Div (occasional)
3. Scope probe connected to wrong signal pin (occasional)

First check

Remove AS131 adapter and connect probe directly to scope channel 1

Test point: Oscilloscope channel 1 input
Expected: AS131 adapter removed; probe directly connected to channel 1

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

Adult NIBP cuff inflation or deflation not working patient safety

Adult cuff fails to inflate to expected pressure or does not deflate after measurement

Ranked causes

1. Cuff not properly seated on arm or tubing obstruction (common)
2. Dead-man cuff detection failure (cuff not on limb) (occasional)

First check

Measure adult cuff inflation pressure during normal measurement cycle

Test point: NIBP cuff pressure, NIBP display menu
Expected: Inflates to approximately 170 mmHg
Tools: NIBP system display

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

DCU not keeping accurate time caution

DCU system clock drifts or displays incorrect time and date

Ranked causes

1. DCU system clock out of calibration or battery backed time circuit failure (common)
2. DCU Display Assembly time circuit failure if verification fails (occasional)

First check

Perform time set verification on DCU

Test point: DCU system clock and calendar
Expected: Time is recalibrated to the correct time and date

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

DCU sound system not working caution

DCU does not produce audible click tones or alarm sounds during operation

Ranked causes

1. CLICK TONE disabled in SOUND ADJUST SETUPS menu (common)
2. DCU Display Assembly or audio circuitry failure (occasional)

First check

Verify CLICK TONE enabled in SOUND ADJUST SETUPS Menu

Test point: DCU SOUND ADJUST SETUPS Menu CLICK TONE setting
Expected: CLICK TONE is ON

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

DCU system crash alarm occurs patient safety

DCU generates a crash alarm and fails to boot properly to normal operation screen

Ranked causes

1. DCU firmware or software fault; cold start may recover (common)
2. DCU Display Assembly hardware failure if cold start fails (occasional)

First check

Perform DCU cold start

Test point: DCU power and control sequence
Expected: Monitor boots up correctly and Normal Screen is displayed

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

DCU won't power up on AS201 +18 Vdc output power caution

DCU (Display/Control Unit) fails to power on when connected to AS201 +18 Vdc output

Ranked causes

1. DCU DC fuse defective or open (common)
2. DCU power board or assembly failure (occasional)

First check

Test DCU DC fuse

Test point: DCU DC fuse
Expected: Fuse continuity good
Tools: DMM

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

Dual DCU communication verification

Verify WPU communication with multiple DCUs and parameter synchronization between DCU units

Ranked causes

1. Loss of dual communication between WPU and multiple DCUs (unknown)
2. Parameter display not synchronizing between DCUs (unknown)

First check

Press NIBP START/STOP on first DCU

Test point: WPU NIBP pump
Expected: WPU NIBP pump starts

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

ECG 1 Volt analog signal not present or incorrect amplitude high voltage

Digital scope does not display 1V analog signal on ECG channel during bench testing

Ranked causes

1. Scope probe connected to wrong signal pin (common)
2. Scope horizontal scale not set to 250 ms per division (occasional)

First check

Verify scope probe connected to pin D with pin B as ground

Test point: TF0240 pin D (signal) and pin B (common)
Expected: Probe connected to pin D; ground connected to pin B

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

ECG cable not connected to WECG module caution

ECG cable not properly connected to WECG module or leads not connected to patient simulator

Ranked causes

1. Loose or incorrect ECG cable connection (common)
2. Incorrect ECG lead connections to patient simulator (common)

First check

Verify ECG cable connected to WECG module

Test point: WECG module connector
Expected: ECG cable fully seated in connector

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

ECG heart rate not displaying correctly patient safety

ECG numerics do not display correct heart rate count or shows outside expected 60 ±1 BPM range

Ranked causes

1. Patient simulator output not set to 60 BPM (common)
2. ECG rate counter malfunction (occasional)

First check

Verify patient simulator heart rate is 60 BPM

Test point: Patient simulator output
Expected: 60 BPM

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

ECG trace not displaying QRS waveform patient safety

ECG display does not show moving QRS pulses or shows jittering waveform

Ranked causes

1. ECG lead connection issue or cable malfunction (common)
2. ECG hardware filter or processor malfunction (occasional)

First check

Set TRACE A LEAD to II in ECG menu

Test point: ECG menu configuration
Expected: TRACE A LEAD set to II

6 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

ETCO2 flow measurement out of specification patient safety

Flowmeter reading does not match expected flow rates at sample line or water trap ports during verification

Ranked causes

1. Sample line obstruction or water trap blockage (common)
2. Waste gas port blocked (occasional)

First check

Verify ETCO2 WARMING UP message cleared and O2 cell installed

Test point: Monitor display
Expected: ETCO2 WARMING UP message no longer displayed, exhaust port open

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

ETCO2 reading out of range patient safety

Check gas applied to CO2 sample line but displayed ETCO2 reading not between 67 and 85 mmHg at sea level after 2 minutes of flow

Ranked causes

1. Check gas not properly connected or flowing (common)
2. CO2 monitor or ETCO2 sensor malfunction (occasional)

First check

Verify check gas is connected to BLUE CO2 sample line input

Test point: BLUE CO2 sample line input
Expected: 9091A check gas (10% CO2, BAL, N2) connected via air vented delivery system

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

ETCO2 waveform absent or inconsistent with respiration patient safety

No ETCO2 waveform displayed or waveform does not correlate with operator breathing when nasal cannula is used

Ranked causes

1. Sample line disconnected or damaged (common)
2. Sample line blockage or water trap obstruction (occasional)

First check

Connect nasal cannula to sample line and breathe normally

Test point: Monitor ETCO2 waveform display
Expected: ETCO2 waveform displayed, consistent with respiration rate 10-16 BPM

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

ETCO2 waveform not displayed during nasal breathing patient safety

Nasal cannula connected to CO2 sample line and operator breathing normally but ETCO2 waveform not displayed or inconsistent with respiration rate

Ranked causes

1. Nasal cannula not properly connected or positioned (common)
2. ETCO2 monitor not functioning properly (occasional)

First check

Connect nasal cannula and position on operator's nose

Test point: BLUE CO2 sample line connection; cannula position
Expected: Cannula connected and positioned for normal nasal breathing

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

F.O. TEMP parameter failure or not working patient safety

Fiber optic temperature measurement not displayed or functional

Ranked causes

1. DCU Display Assembly defective (occasional)
2. WPU Electronics Assembly with defective HE113 module (common)

First check

Check Error Code Display status on DCU AB213 Power Board

Test point: DCU AB213 Power Board LEDs
Expected: Left decimal On (lit) solid green, right decimal flashing green, numeric segments Off

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

Gating signal not observed at MR console MRI environment

MR Tech cannot confirm gating pulse at MR console after ECG cable connection and ECG test signal selection

Ranked causes

1. Gating cable not connected or defective (common)
2. ECG test signal not selected correctly (occasional)

First check

Verify gating cable connections at WPU and magnet interface

Test point: Gating cable WPU connector and magnet gating interface
Expected: Cable fully seated and secure at both ends

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

LEAD FAIL message displayed during ECG operation patient safety

LEAD FAIL error message appears on ECG display during testing or normal operation

Ranked causes

1. ECG lead connection loose or disconnected (common)
2. ECG cable malfunction (occasional)

First check

Verify all ECG lead connections to patient simulator terminals

Test point: Patient simulator terminals
Expected: All leads firmly connected per color code: GREEN=RL, WHITE=RA, BLACK=LA, RED=LL

Neonatal NIBP cuff inflation or deflation not working patient safety

Neonatal cuff fails to inflate to expected pressure or does not deflate after measurement

Ranked causes

1. Cuff not properly seated on finger or tubing obstruction (common)
2. Dead-man cuff detection failure (cuff not on limb) (occasional)

First check

Measure neonatal cuff inflation pressure during normal measurement cycle

Test point: NIBP cuff pressure, NIBP display menu
Expected: Inflates to approximately 130 mmHg
Tools: NIBP system display

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

O2 sensor reading out of specification patient safety

O2 reading does not display 21%±1 at ambient air after initialization calibration

Ranked causes

1. O2 sensor degradation or failure (occasional)
2. Calibration procedure not completed correctly (occasional)

First check

Access O2 initialization calibration menu

Test point: SETUPS > SERVICE (BIO-MED) > GAS CAL > O2 INIT CAL
Expected: Menu accessible, 2 MINUTE WARNING message appears

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

Patient accessories cleaning and inspection patient safety

Reusable patient accessories show visible dirt, debris, cracks, or contamination; require cleaning and disinfection per protocol.

Ranked causes

1. Normal accumulation of dirt and debris on reusable accessories (common)
2. Visible damage to accessory (cracks, holes, tears, cuts) (occasional)

First check

Remove reusable accessory from monitor

Test point: Accessory connection points on monitor
Expected: Accessory cleanly disconnected and removed

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

Perkin Elmer agent bench flow measurement out of specification patient safety

Exhaust flow rate does not meet 230 ml/min ±40 ml/min specification or waste gas port blockage test fails

Ranked causes

1. Sample line obstruction or flowmeter miscalibration (common)
2. Waste gas port blockage (occasional)

First check

Verify agents parameter is ON and water trap cleared

Test point: AGENTS parameter, CLEAR WATER TRAP, CLEAR SAMPLE LINE
Expected: ETCO2 WARMING UP message no longer displayed; exhaust port open

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

QRS detection failing in NEO patient mode at low amplitude patient safety

QRS count does not display or shows no flashing heart and tone when 0.5 mV signal input in NEO patient mode

Ranked causes

1. NEO mode sensitivity threshold not properly configured (occasional)
2. Signal level below NEO mode detection threshold (common)

First check

Enter SETUPS menu and set PATIENT to NEO

Test point: SETUPS menu PATIENT setting
Expected: PATIENT set to NEO

5 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

QRS HR rate tone not producing sound patient safety

No QRS heart rate tone output or double tones detected

Ranked causes

1. Audio circuit malfunction or speaker failure (occasional)
2. ECG signal processing error producing double tones (rare)

First check

Verify QRS HR rate tone is present and audible

Test point: Speaker output
Expected: Audible QRS rate tone

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

Speaker crackling or distortion at maximum alarm volume caution

Speaker produces crackling noise or excessive distortion when ALARM VOLUME set to level 10

Ranked causes

1. Speaker damaged or audio amplifier distorting (rare)
2. Audio amplifier circuit fault (occasional)

First check

Set ALARM VOLUME to level 10 and listen for distortion

Test point: SOUNDADJUST menu, ALARM VOLUME setting
Expected: Loud tone with no crackling or excessive distortion

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

Temperature reading not displayed patient safety

Temperature option enabled and temperature probe connected to WPU port but ambient temperature reading not displayed

Ranked causes

1. Temperature probe not connected or probe malfunction (common)
2. Temperature option not enabled in menu (occasional)

First check

Enable Temperature option in menu

Test point: SETUPS / PARAMETER SELECTION menu
Expected: TEMPERATURE turned on

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

Time and date not accurate or not retained

DCU time and date display is incorrect, loses time when powered off, or gains/loses time during operation

Ranked causes

1. Real-time clock battery depleted or failing (occasional)
2. RTC crystal or oscillator circuit fault (rare)

First check

Enter SETUPS menu and verify time and date displayed

Test point: DCU SETUPS menu, SET TIME option
Expected: Current time and date accurately displayed

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

WECG module not communicating patient safety

WECG module with 9065 battery does not communicate with 3160 system

Ranked causes

1. WECG battery not inserted or depleted (common)
2. WECG module communication link failure (occasional)

First check

Verify 9065 battery inserted in WECG module

Test point: WECG module battery compartment
Expected: 9065 battery properly seated

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

WECG module not communicating with 3160 system patient safety

WECG module with 9065 battery inserted does not establish communication link to 3160 system

Ranked causes

1. 9065 battery not properly inserted or depleted (common)
2. WECG wireless communication module failure (occasional)

First check

Verify 9065 battery properly seated in WECG module

Test point: WECG battery compartment
Expected: Battery fully inserted with positive terminal contacting spring

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

WECG module not receiving battery power or communicating with system

WECG module does not operate when 9065 battery inserted, no communication with 3160 system

Ranked causes

1. 9065 battery not inserted or depleted (common)
2. WECG module or communication circuit failure (occasional)

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

WPU program update interrupted or halted

WPU loses power or USB device removed during reprogramming; unit may no longer function properly or communicate with DCU.

Ranked causes

1. Power loss during WPU reprogramming (occasional)
2. USB device removed during WPU reprogramming (occasional)

First check

Verify WPU establishes DCU communication within 1 minute of power-on

Test point: DCU display
Expected: DCU shows communication with WPU established

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

WPU won't power up on AS201 +18 Vdc output power caution

WPU (Wireless Patient Unit) fails to power on when connected to AS201 +18 Vdc output

Ranked causes

1. WPU DC fuse defective or open (common)
2. WPU Electronics Assembly failure (occasional)

First check

Test WPU DC fuse

Test point: WPU DC fuse
Expected: Fuse continuity good
Tools: DMM

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

AB213 Power Board Error Code Display and Recovery high voltage

Fatal error code displayed on AB213 power board LED displays (U8 and U9) requiring diagnosis and corrective action

Ranked causes

1. Various power board malfunctions indicated by specific error codes in Table G-1 (unknown)

First check

Power off monitor and disconnect power adapter

Test point: PCU and DCU power switches
Expected: Both switches in OFF position, AS201 adapter unplugged, batteries removed

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

AGENTS or ETCO2 parameter not displayed after power up

AGENTS or ETCO2 parameter missing from DCU display following system startup

Ranked causes

1. AGENTS or ETCO2 not enabled in SETUPS menu (common)

First check

Verify WARMING UP message displayed at top center of DCU display

Test point: DCU display top center
Expected: WARMING UP message shown

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

Alarm volume not producing audible tone caution

No audible tone or distorted sound output from alarm at various volume levels

Ranked causes

1. Speaker failure or audio circuit malfunction (unknown)

First check

Press SETUP function key and navigate to SOUNDADJUST > ALARM VOLUME

Test point: DCU display menu
Expected: SOUND ADJUST menu opens

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

Alarm volume not producing sound or has distortion

Speaker produces no tone at low level, crackling, or excessive distortion at high level

Ranked causes

1. Speaker failure or audio circuit defect (unknown)

First check

Verify audible tone at ALARM VOLUME level 1

Test point: Speaker output
Expected: Audible tone produced

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

Ambient temperature not displayed

WPU does not show ambient temperature reading after temperature probe is connected

Ranked causes

1. Temperature probe not connected or not recognized (common)

First check

Enable TEMPERATURE in menu

Test point: WPU menu
Expected: TEMPERATURE turned on

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

Anesthetic agents verification not performed

Verification step not applicable if gas option not installed; requires checking software revision to determine which agent bench is installed

Ranked causes

1. No anesthetic agents option installed (unknown)

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

Audible tone not produced at alarm volume level 1

ALARM VOLUME setting at level 1 does not produce an audible tone from speaker

Ranked causes

1. Speaker not functioning or muted (unknown)

First check

Set ALARM VOLUME and verify audible tone

Test point: SOUNDADJUST menu, ALARM VOLUME setting
Expected: Audible tone produced at level 1

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

Calibration: Anesthetic agents span adjustment patient safety

Agent (Desflurane, Sevoflurane, Isoflurane, Halothane, Enflurane) or CO2/N2O reading does not match expected value; requires manual menu adjustment for each gas calibrated.

Ranked causes

1. Agent bench requires span calibration after repair or installation (common)

First check

Vent residual gases from water trap

Test point: GAS (EtCO2) port
Expected: Minimum 90 seconds with port open

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

Calibration: CO2 Occlusion Test

Verify pump motor responds to CO2 port occlusion by increasing speed and displaying CO2 OCCLUSION message, then decreases speed and shows READJUSTING CO2 ZERO when occlusion is cleared.

Ranked causes

1. CO2 port occlusion detection malfunction (unknown)

First check

CO2 OCCLUSION message appears at top of display screen

Test point: Display screen
Expected: CO2 OCCLUSION

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

Calibration: DCU verification

Verify proper operation of AS240 DCU Assembly by visual inspection of front panel indicators and controls.

Ranked causes

1. AS240 DCU Assembly not functioning properly (unknown)

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

More symptoms

Calibration: EtCO2 span adjustment
Calibration: Fiber Optic Temperature Verification
Calibration: Gas Monitor Test
Calibration: Monitor Calibration Verification
Calibration: Power Adapter verification
Calibration: Pump Air Flow Test
Calibration: Pump Speed Test
Calibration: Span Calibration Test
Click tone volume not producing audible tone
CO2 occlusion not detected
Communication verification between DCU, WPU, and remote modules
DCU control panel not working
DCU powers up but has no display
DCU program update fails to complete
DCU won't power up on +14.4 Vdc battery power
ECG cable or leads not connected correctly to Patient Simulator
ECG lead I verification failing
ECG lead III verification failing
ETCO2 hardware failure indicated
ETCO2 HW FAIL message displayed
ETCO2 not detected
ETCO2 or AGENTS parameter not active during test
ETCO2 parameter not displayed after power up
ETCO2 reading out of tolerance
ETCO2 reading outside expected range
ETCO2 warming up message persists
ETCO2 waveform not displayed
ETCO2 zero calibration flow out of specification
Keypad function not responding
Keypad not functioning
Keypad not responding or non-functional
Low-flow ETCO2 module replacement
Monitor external cleaning required
NIBP calibration accuracy out of tolerance
NIBP calibration error detection not working
NIBP offset out of range
NIBP over-pressure threshold not triggered (Adult)
NIBP over-pressure threshold not triggered (Neonatal)
NIBP pneumatic system leaks
NIBP pump does not shut off on sense port timeout
No ETCO2 waveform detected during respiration
O2 calibration reading outside tolerance
O2 sensor expired
Patient mode not switching to ADULT mode correctly
Patient simulator QRS output not configured correctly
Power icon verification under different supply conditions
Pressure transducer simulator reading out of tolerance
Pulse volume not functioning
Pulse volume not producing audible tone
Pulse volume or click tone volume not correct
QRS count not zeroing at low amplitude in ADULT mode
QRS symbol (flashing heart) not displaying
Readjusting CO2 zero
Respiration rate not measured
RF noise in MRI image during test
RF noise test failure at bench
Sample line flow rate out of tolerance
Sample line occlusion not detected
Speaker distortion or crackling at high volume
STATUS code E-1: Blocked channel does not detect heat
STATUS code E-10: EEPROM version different than 3
STATUS code E-11: EEPROM version not supported
STATUS code E-12: EEPROM chip test failed
STATUS code E-13: Agent bench not present
STATUS code E-2: Sensor voltage out of range
STATUS code E-3: Invalid thermal gains
STATUS code E-4: EEPROM failure
STATUS code E-5: Cannot distinguish between DES and SEV
STATUS code E-6: EEPROM agent type not supported
STATUS code E-7: EEPROM checksum test failed
STATUS code E-8: EEPROM root solution failed
STATUS code E-9: EEPROM interference matrix inversion failed
Time and date not displayed or incorrect
Time and date not displaying correctly
Time and date not set or incorrect
Time and date reset after power cycle
Time drift or clock loss over time
Waste gas port flow restriction
Water trap left port flow out of tolerance
Water trap right port flow out of tolerance
WECG battery not communicating with system
WPU Electronics Assembly setup before adjustment
WPU NAV mode entry required before USB update
WPU program elements not correctly loaded after update
WPU won't communicate with DCU
WPU won't power up on +14.4 Vdc battery power
Zero port flow out of tolerance

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

Error codes

Code	Meaning	Trigger	Severity
`01`	+3.3 Vdc System Power Start-Up Error	System power voltage error detected during startup initialization	critical
`02`	+3.3 Vdc System Power Run Error	System power voltage error detected during operation	critical
`03`	+5 Vdc System Power Start-Up Error	5V rail voltage error detected during startup	critical
`04`	+5 Vdc System Power Run Error	5V rail voltage error detected during operation	critical
`05`	+12 Vdc System Power Start-Up Error	12V rail voltage error detected during startup	critical
`06`	+12 Vdc System Power Run Error	12V rail voltage error detected during operation	critical
`07`	Recorder Power Start-Up Error	Recorder power supply error during startup	critical
`08`	Recorder Power Run Error	Recorder power supply error during operation	critical
`09`	Power Board 5VL to Processor 3.3VL conversion error	Voltage conversion circuit error detected	critical
`11`	Motherboard Keep Alive Circuit Run Error	Keep alive circuit failed during operation	critical
`12`	Motherboard Keep Alive Circuit Start Error	Keep alive circuit failed during startup	critical
`13`	Motherboard Communications Error	Communication failure between motherboard components	error
`14`	Power Board Memory Error	Memory test failure detected on power board	critical
`15`	Power Board Clock Oscillator Error	Clock reference signal failure detected	critical
`16`	9064 Battery Low Voltage Error	Backup battery voltage below minimum threshold	warning
`17`	System Overcurrent Error	System current draw exceeded safe limits	critical
`18`	Power Adapter Over/Under-Voltage Error	AS201 Power Adapter input or output voltage out of range	critical
`19`	Power Board Switched Power Error	Switched power supply circuit error	critical
`31`	9064 Battery No Start Bit Error	Battery communication protocol error at startup	error
`32`	9064 Battery No Acknowledge Bit Error	Battery communication protocol error during operation	error
`34`	9064 Battery No Stop Bit Error	Battery communication protocol error during shutdown	error
`ETCO2: LOW FLOW`	ETCO2 sample line or water trap is disconnected or not attached	Sample line or water trap separation during operation	warning
`FAIL`	RF Noise Test did not pass acceptable limits	One or more frequency spectrums measured RF noise levels exceeding acceptable thresholds during automated bench testing	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.