Test equipment MRI accessories · Expression family

Invivo 865214: troubleshooting and error codes

The ServiceForge knowledge base holds 40 documented symptoms for the Invivo 865214, with 56 ranked causes, 119 diagnostic checks with test points and expected values, and 1 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 not holding charge or reduced runtime

Battery powers equipment for significantly shorter duration than normal operation

Ranked causes

1. Battery life expired (common)
2. Battery dirty terminals (occasional)
3. Reduced runtime during active monitoring (common)

First check

Inspect battery terminals for dirt or corrosion

Test point: Battery connector terminals
Expected: Clean, dry terminals without visible dirt or oxidation

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

Cart pulled toward MR system by magnetic field MRI environment

Expression MRI Patient Monitoring System Cart experiences magnetically induced pull force toward MR bore face during operation in MR system room

Ranked causes

1. Cart positioned inside 5,000 Gauss (0.5T) field line of MR system (common)
2. Wheel locks not engaged when cart in MR system room (common)
3. Field strength variations or future system enhancements affecting local field distribution (occasional)

First check

Verify cart position relative to MR bore center line

Test point: 5,000 Gauss field line boundary
Expected: At or outside 5,000 Gauss (0.5T) field line

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

Agents flow measurement out of specification

Gas flow rate does not match expected values during flow verification test for adult, neonatal, and water trap configurations

Ranked causes

1. Gas sample line blocked, water trap saturated, or pump failure (common)
2. Flowmeter calibration error or incorrect setup (occasional)

First check

Enable AGENTS and set PATIENT mode to ADULT

Test point: DCU SETUPS / PARAMETER SELECTION menu
Expected: AGENTS turned ON, PATIENT set to ADULT

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

DCU ferrous material attraction in MRI field MRI environment

DCU containing ferrous materials may be attracted to MR magnetic field, causing patient or user injury during installation or removal near the bore

Ranked causes

1. DCU positioned within 1,000 Gauss (0.1 T) field line during installation or removal (common)
2. Removing DCU too close to MR system magnetic field (common)

First check

Verify DCU installation location distance from MR bore center

Test point: MR system center line
Expected: At least 1,000 Gauss (0.1 T) field line distance

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

ETCO2 zero calibration or flow measurement error

ETCO2 module does not display zero calibration message during startup or flow rate out of specification after water trap installation

Ranked causes

1. ETCO2 module warm-up incomplete or sensor miscalibrated (common)
2. ETCO2 sample line flow restriction or water trap blockage (occasional)

First check

Enable ETCO2 in SETUPS/PARAMETER SELECTION menu

Test point: DCU parameter selection menu
Expected: ETCO2 turned ON

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

NIBP adult cuff inflation/deflation abnormal patient safety

Cuff fails to inflate to expected pressure range or does not deflate properly after measurement completion

Ranked causes

1. NIBP cuff disconnected, blocked, or pump failure (common)
2. Blood pressure algorithm failure to detect measurement endpoint (occasional)

First check

Connect adult cuff around arm

Test point: NIBP cuff placement
Expected: Cuff snug around arm, no air leaks

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

NIBP overpressure detection failure (adult mode) patient safety

System does not detect overpressure condition or does not display OVER PRES message when excessive pressure applied

Ranked causes

1. Overpressure relief valve stuck or malfunctioning (common)
2. NIBP firmware does not trigger OVER PRES alarm at correct threshold (occasional)

First check

Apply 295 ± 4 mmHg pressure to NIBP pump port (adult)

Test point: NIBP Pump (right) port
Expected: 295 ± 4 mmHg applied, ±4 mmHg

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

NIBP overpressure detection failure (neonatal mode) patient safety

System does not detect or signal overpressure condition when excessive pressure applied in neonatal patient mode

Ranked causes

1. Neonatal overpressure threshold not calibrated or relief valve failed (common)
2. Overpressure alarm delay exceeds 15 second specification (occasional)

First check

Set patient mode to NEO and apply 150 ± 4 mmHg pressure

Test point: NIBP Pump (right) port, PATIENT mode set to NEO
Expected: 150 ± 4 mmHg applied, ±4 mmHg

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

NIBP pneumatic leak test failure patient safety

Pressure difference between peak and final readings not within acceptable range during NIBP cuff inflation and deflation cycles

Ranked causes

1. NIBP cuff or hose has internal or external leak (common)
2. NIBP pump not holding pressure during test (occasional)

First check

Wrap cuff around fixed object tightly

Test point: NIBP cuff
Expected: Cuff secured without air gaps

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

Power supply not properly positioned for MRI safety MRI environment

Power supply P/N 989803169201 or 989803168201 positioned closer than 10 feet (3 meters) to MR system, risking magnet attraction or interference.

Ranked causes

1. Power supply installed too close to MRI magnet (common)
2. Grounding integrity compromised by extension cords (occasional)

First check

Measure distance from power supply to MR system

Test point: MR system magnet bore
Expected: 10 feet (3 meters) or more, minimum

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

SpO2 communication failure with WSPO2 module

Probe status not displayed, missing pulse waveform, or incorrect SpO2 numeric reading when WSPO2 module connected with fiber optic sensor

Ranked causes

1. SpO2 probe not inserted correctly or no finger in probe (common)
2. SpO2 fiber optic sensor not connected or faulty (occasional)

First check

Enable SpO2 parameter

Test point: DCU SETUPS / PARAMETER SELECTION menu
Expected: SpO2 enabled

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

System communication failure between DCU and wireless modules

Icons for DCU, WPU, WECG, and WSPO2 remotes not present on DCU display under various power conditions (DC only, AC with batteries, AC without batteries)

Ranked causes

1. Wireless module not powered or battery depleted (common)
2. Module communication disabled or not configured (occasional)

First check

Verify wireless module icons displayed on DCU

Test point: DCU display
Expected: Icons for DCU, WPU, WECG, WSPO2 present

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

System or module power-up failure with AC adapter high voltage

DCU and Cart power indicator LEDs do not illuminate green after AC power applied, indicating no DC power supply output or connection issue

Ranked causes

1. AC power cord not connected to mains or power adapter faulty (common)
2. DCU or Cart DC input connector not fully seated or contact corrosion (occasional)

First check

Verify AC power cord connected to AC mains outlet

Test point: Power adapter AC input
Expected: AC power cord (HE02) firmly connected to mains outlet

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

WECG communication failure with patient simulator

No ECG waveform, heart rate tone issues, or incorrect numeric display when WECG module connected to patient simulator

Ranked causes

1. WECG leads not properly connected to simulator (common)
2. Patient simulator not outputting correct QRS signal (occasional)

First check

Verify WECG lead connections to simulator

Test point: Lead wires: GREEN, WHITE, BLACK, RED
Expected: Connected per Table 2: GREEN-RL, WHITE-RA, BLACK-LA, RED-LL

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

Battery exhibits abnormal condition patient safety

Battery shows abnormal heat, odor, color, deformation, puncture, or liquid leakage

Ranked causes

1. Battery defect or damage (rare)

First check

Visually inspect battery for abnormal heat, odor, color, deformation, puncture, or leakage

Test point: Battery exterior and connector area
Expected: Normal appearance: no odor, normal color, no deformation, no visible damage or leakage

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

Battery forced into compartment causing damage caution

Physical damage to battery or Expression MRI Patient Monitoring System due to forced battery insertion

Ranked causes

1. Excessive force applied during battery installation (occasional)

First check

Verify battery slides smoothly into compartment without resistance

Test point: Battery insertion motion
Expected: Battery slides smoothly and latches automatically without excessive force

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

Battery installation in MR magnetic field MRI environment

Attempt to install or remove ferrous battery within 1,000 Gauss (0.1 T) field line of MR bore centerline

Ranked causes

1. Battery attracts to magnetic field causing injury hazard (common)

First check

Confirm PMC/Cart/DCU location relative to MR magnetic field

Test point: Distance from MR bore centerline
Expected: Unit located outside of 1,000 Gauss (0.1 T) field line

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

Battery not latching into compartment

Battery does not automatically latch when inserted into Cart, PMC, or DCU battery compartment despite being fully inserted

Ranked causes

1. Battery oriented incorrectly (common)

First check

Verify battery orientation matches device geometry

Test point: Battery compartment
Expected: Battery contours align with compartment geometry

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

Cannot safely remove cart stuck to MR system by magnetic field MRI environment

Cart magnetically adhered to MR bore face and operator unable to safely dislodge equipment

Ranked causes

1. Improper extraction technique causing vertical MR pull force concentration at base (common)

First check

Identify correct dislodging point on cart structure

Test point: Cart base lowest point vs. DCU/guide handle locations
Expected: Technician ready to pull only from base at lowest point of system

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

CO2 gas detection measurement error

System does not detect or measure CO2 gas correctly when 10% (76 mmHg) CO2 applied; respiration count exceeds specification during gas flow

Ranked causes

1. CO2 sensor contaminated, expired, or miscalibrated (common)

First check

Apply 10% (76 mmHg) CO2 gas to agents inlet

Test point: Agents CO2 input port
Expected: 10% CO2 gas (76 mmHg equivalent) flowing into system

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

CO2 occlusion not displayed patient safety

Message 'CO2 OCCLUSION' does not appear on screen within expected time frame

Ranked causes

1. CO2 detection system malfunction (unknown)

First check

Verify CO2 occlusion message display

Test point: DCU display
Expected: CO2 OCCLUSION message appears

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

DCU damage from AC mains connection while docked to Cart caution

Damage to DCU or power cable may result if DCU is docked to Cart while still connected to AC mains power

Ranked causes

1. Docking DCU to Cart while AC mains power cable connected (occasional)

First check

Verify AC power disconnection before docking

Test point: Power cable connection status
Expected: AC power cord unplugged from outlet or power converter

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

DCU Power Converter Kit magnetic hazard in MR system room MRI environment

DCU Power Converter Kit is magnetic and will be pulled into MR system if brought into MR system room, creating safety hazard

Ranked causes

1. DCU Power Converter Kit (P/N 453564123631) brought into or used in MR system room (occasional)

First check

Verify DCU Power Converter location prior to use

Test point: Installation location
Expected: MR control room or holding area only, not MR system room

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

DCU printer malfunction near MR magnetic field caution

DCU printer may fail to operate or be damaged if DCU moved too close to 1,000 Gauss (0.1 T) field line

Ranked causes

1. DCU with printer option positioned closer than 1,000 Gauss (0.1 T) field line in MR system room (occasional)

First check

Verify DCU with printer location distance from MR bore

Test point: MR system center line
Expected: At or outside 1,000 Gauss (0.1 T) field line

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

DCU without printer exceeds safe MR field proximity caution

DCU without printer option may be damaged or fail to operate if positioned closer than 5,000 Gauss (0.5 T) field line

Ranked causes

1. DCU without printer positioned closer than 5,000 Gauss (0.5 T) field line (occasional)

First check

Verify DCU without printer location distance from MR bore

Test point: MR system center line
Expected: At or outside 5,000 Gauss (0.5 T) field line

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

Initial battery charge insufficient for operation

Batteries not fully charged and conditioned before first use, resulting in reduced operating time

Ranked causes

1. Battery not charged 12 hours before first use (common)

First check

Verify initial battery charging was performed for 12+ hours

Test point: Battery charge history
Expected: All batteries charged minimum 12 hours at AC power with Expression off before first use

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

Invasive pressure (IBP) transducer readings out of tolerance

IBP pressure values do not match pressure simulator input within specified tolerance range at P1 or P2 ports

Ranked causes

1. IBP transducer or cable faulty or sensor miscalibrated (common)

First check

Enable P1 and P2 in SYSTEM CONFIG and PARAMETERS

Test point: DCU SETUPS / SERVICE / SYSTEM CONFIG and SETUPS / PARAMETERS SELECTION menus
Expected: P1 and P2 turned ON

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

Neonatal NIBP cuff measurement failure patient safety

Neonatal cuff does not inflate to expected pressure, measurement incomplete, or numeric readings missing when measuring neonatal blood pressure on finger held above shoulder height

Ranked causes

1. Neonatal cuff disconnected, too loose, or blocked (common)

First check

Set patient mode to NEO

Test point: DCU SETUPS / PATIENT MODE
Expected: PATIENT mode set to NEO

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

Neonatal NIBP dead man (occlusion) cuff test failure

System does not display zero reading after neonatal cuff NIBP cycle when wrapped around fixed object without blood signal

Ranked causes

1. NIBP measurement algorithm does not recognize absent pulse in neonatal mode (occasional)

First check

Set patient mode to NEO

Test point: DCU SETUPS / PATIENT MODE
Expected: PATIENT mode set to NEO

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

NIBP calibration accuracy error at high pressure

Pressure transducer reading not within tolerance when 250 mmHg applied to NIBP pump port

Ranked causes

1. Secondary or primary pressure transducer drift or failure (common)

First check

Set patient mode and apply pressure to secondary pump port

Test point: NIBP Pump (right) port
Expected: 250 mmHg applied

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

NIBP calibration error when not in standby

CALIB message does not appear within timeout when NIBP START/STOP button pressed outside of standby mode

Ranked causes

1. System not in required standby state for safe calibration (common)

First check

Ensure unit NOT in STANDBY mode and apply 15 mmHg pressure

Test point: System mode, NIBP pump input
Expected: Unit active, 15 mmHg applied

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

NIBP dead man (occlusion) cuff test failure

System does not display zero reading when NIBP cuff placed around fixed object with no blood flow

Ranked causes

1. NIBP algorithm or sensor cannot detect absence of blood flow signal (occasional)

First check

Connect adult cuff around fixed 1 inch diameter object

Test point: NIBP cuff placement
Expected: Cuff tight around rigid object, no pulse signal

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

NIBP leak time out error

NIBP pump does not shut off within specified timeout or does not display NOT INFLATING error message when cuff disconnected

Ranked causes

1. NIBP pump timeout circuit or pressure sensor failure (common)

First check

Remove all cuff connections and open NIBP ports (adult mode)

Test point: NIBP pump ports
Expected: All connections removed, ports open to atmosphere

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

NIBP offset reading out of tolerance

NIBP pressure offset not within specified range when no pressure applied

Ranked causes

1. NIBP transducer requires recalibration (common)

First check

Apply no pressure to NIBP system

Test point: NIBP pump
Expected: No applied pressure

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

O2 sensor expiration or calibration error

O2 sensor expired or does not calibrate to correct ambient oxygen value (21%) after performing O2 initialization calibration

Ranked causes

1. O2 sensor cartridge expired or calibration drift (common)

First check

Insert Artema O2 sensor into sensor port

Test point: O2 sensor port at back of Cart
Expected: O2 sensor cartridge fully inserted

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

Power supply communication not verified before patient use patient safety

Expression MRI Patient Monitoring System communication with DCU not verified prior to patient use, risking system malfunction during monitoring.

Ranked causes

1. Communication verification not performed (common)

First check

Test communication between Expression system and DCU

Test point: Expression system wireless transceiver and DCU receiver
Expected: Bidirectional communication established; no errors or timeouts

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

Respiration rate not displaying patient safety

DCU does not show respiration rate or rate is inconsistent with normal range

Ranked causes

1. Respiration sensor or bellows connection issue (unknown)

First check

Verify respiration rate display

Test point: DCU respiration display
Expected: Rate consistent with normal respiration (10-16 BPM), 10-16 BPM

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

Temperature reading not accurate patient safety

Temperature probe reading does not match ambient temperature within tolerance

Ranked causes

1. Temperature probe malfunction or sensor drift (unknown)

First check

Verify temperature probe reading accuracy

Test point: Temperature display vs. ambient
Expected: Ambient temperature ±2°C, ±2°C

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

Unused DC output not covered on power supply MRI environment

DC Output Connector on power supply P/N 989803168201 left uncovered when only one output is used, causing noise artifacts on MR image.

Ranked causes

1. Unused DC output uncovered (common)

First check

Inspect DC output connectors on power supply

Test point: DC Output Connectors (2) on P/N 989803168201
Expected: Unused output covered with Shield Cap

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

Wireless ECG or SpO2 module battery creates image artifact

9065 battery or WECG/WSpO2 module positioned in MR field of view causing image artifact

Ranked causes

1. Battery or module in MR field of view (occasional)

First check

Verify WECG/WSpO2 module and 9065 battery location relative to MR field of view

Test point: Module and battery position
Expected: Located outside MR imaging field of view

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

Error codes

Code	Meaning	Trigger	Severity
`Communication Error`	Loss or degradation of wireless communication between Expression system and DCU	Expression and DCU operating in same MR room or high-powered radio transmitter operating nearby	warning

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.