Blood warmers · Prismax 2025 family

Vantive TherMax: troubleshooting and error codes

The ServiceForge knowledge base holds 25 documented symptoms for the Vantive TherMax, with 61 ranked causes, 23 diagnostic checks with test points and expected values, and 39 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Built-In On-going Test (BIOT) fails during operation patient safety

Service LED illuminated during normal operation; heater power disconnected; device enters Malfunction mode

Ranked causes

1. Temperature sensor reading out of range (common)
2. Plate temperature variation exceeds 10°C (common)
3. PWM power variance exceeds 20% over 2-second window (occasional)
4. System voltages or currents out of specified range (occasional)
5. Blood leak detector absent or malfunctioning (occasional)
6. Outlet temperature change exceeds 20% deviation over 10 seconds (occasional)

First check

Measure all temperature sensor readings

Test point: Plate, inlet, outlet, compensation sensors
Expected: >10°C and <50°C

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

Power-On Self Test (POST) fails patient safety

Service LED illuminated, device enters Malfunction mode at startup after power applied or hardware reset

Ranked causes

1. Software version incompatible with installed circuit boards (unknown)
2. Operational voltages out of acceptable limits (unknown)
3. Temperature sensor reading out of range (>10°C and <50°C) (unknown)
4. Plate temperature sensor difference exceeds 10°C (unknown)
5. Bus or analog-to-digital converter malfunction (unknown)
6. Leakage current self-test failure (unknown)

First check

Verify installed software version matches installed circuit boards

Test point: System firmware and hardware configuration
Expected: Software version compatible with circuit boards

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

Leak Detector calibration fails

Self-Service Test Leak Detector calibration does not complete; leak sensing not responding.

Ranked causes

1. Dirty Leak Detection Sensors (common)
2. Defective Blood Leak Detection Sensor (occasional)
3. Defective Rear Leak Detection Sensor (occasional)
4. Defective Heater Control Board (occasional)
5. Cable continuity issue (occasional)

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

Front Leak Detection test fails

Self-Service Test indicates Front Leak Detector is not functioning properly.

Ranked causes

1. Dirty Blood Leak Detection Sensors (common)
2. Defective Blood Leak Detection Sensor (occasional)
3. Defective Heater Control Board (occasional)
4. Cable continuity issue (occasional)

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

Bag Detect calibration fails

Self-Service Test Bag Detect sensor calibration does not complete; bag detection not working properly.

Ranked causes

1. Dirty bag detector sensors (common)
2. Defective Bag Detection and Leak Detection Receive Board (occasional)
3. Cable continuity issue (occasional)

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

Bag Type Verification test fails

Self-Service Test indicates Bag Detection Sensor is not properly identifying bag type.

Ranked causes

1. Dirty Bag Type Verification Sensors (common)
2. Defective Bag Detection and Leak Detection Receive Board (occasional)
3. Cable continuity issue (occasional)

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

Calibration: TherMax pairing with PrisMax patient safety

TherMax must be paired with PrisMax control unit after calibration and SSTs are completed. Pairing procedure is executed in Service Environment on Configuration page.

Ranked causes

1. TherMax not paired with PrisMax (common)
2. TherMax previously installed but not paired (occasional)
3. TherMax already in Paired List (common)

First check

Verify Installation Procedure completed if TherMax is new

Test point: Heater Control Board memory
Expected: Calibration and SST data saved in internal memory

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

Power Delivery Test fails high voltage

Self-Service Test indicates Heater Control Board is not delivering adequate power during heating cycle.

Ranked causes

1. Defective Heater Control Board (common)
2. Defective Heater Plates (occasional)
3. Cable continuity issue (occasional)

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

Power Switch Control test fails

Self-Service Test indicates power switch control circuits not responding properly.

Ranked causes

1. Defective Display Board (common)
2. Defective Display Control Panel (occasional)
3. Cable continuity issue (occasional)

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

Rear Leak Detection test fails

Self-Service Test indicates Rear Leak Detector is not functioning properly.

Ranked causes

1. Dirty Rear Leak Detection Sensors (common)
2. Defective Rear Leak Detection Sensor (occasional)
3. Cable continuity issue (occasional)

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

Safety System test fails patient safety

Self-Service Test indicates overheat protection safety system is not functioning; Heater Control Board not cutting off power to heater plates when overheat detected.

Ranked causes

1. Defective Heater Control Board (common)
2. Defective Heater Plates (occasional)
3. Cable continuity issue (occasional)

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

Temperature Accuracy Test fails

Self-Service Test (SST) Temperature Accuracy Test result indicates temperature sensor out of range relative to others.

Ranked causes

1. Faulty Bag Inlet or Outlet Temperature Sensor (common)
2. Defective Heater Plates (occasional)
3. Defective Ambient Temperature Sensor (occasional)

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

Therapy Alarm Test (TAT) detects abnormal outlet temperature patient safety

Alarm triggered during operational stage; heating mode disabled if outlet temperature conditions extreme

Ranked causes

1. Commanded plate temperature exceeds 45.4°C (occasional)
2. Outlet temperature exceeds set-point by >1°C for >10 minutes (occasional)
3. Outlet temperature below set-point by >1°C for >5 minutes (occasional)

First check

Monitor outlet temperature against set-point

Test point: Outlet temperature sensor
Expected: Within ±1°C of set-point for >5 minutes

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

Therapy Alarm Test (TAT) detects disposable not loaded or not locked patient safety

Alarm declared when disposable detection or lock sensor indicates device not properly loaded or secured

Ranked causes

1. Disposable not inserted in device (common)
2. Disposable not fully locked or seated (common)

First check

Verify disposable is loaded in device

Test point: Disposable detection sensor
Expected: Disposable present and detected

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

Blood warmer failure due to ESD damage patient safety

Device malfunction caused by improper handling of electronic circuits during disassembly without electrostatic protection

Ranked causes

1. Electrostatic discharge (ESD) damage to electronic circuits (common)

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

Cycle Heating LED test fails

Self-Service Test indicates green Heating LED is not operating or responding.

Ranked causes

1. Defective Display Board (common)

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

Cycle Power LED test fails

Self-Service Test indicates idle (amber) and on (green) power LEDs not cycling or functioning.

Ranked causes

1. Defective Display Board (common)

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

Cycle Service LED test fails

Self-Service Test indicates red Service LED is not cycling or responding to test commands.

Ranked causes

1. Defective Display Board (common)

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

Live Outputs/Mechanical Switch test fails

Self-Service Test indicates bag lock mechanism output or mechanical switch not operating.

Ranked causes

1. Defective Bag Lock Assembly (common)

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

Therapy Alarm Test (TAT) detects cover not latched patient safety

Alarm triggered when cover lock sensor indicates cover is not properly latched

Ranked causes

1. Cover not fully closed or latched (common)

First check

Verify cover is fully latched

Test point: Cover lock sensor
Expected: Cover latched and sensor activated

Therapy Alarm Test (TAT) detects high plate temperature patient safety

Alarm declared when any plate temperature sensor reads >46°C

Ranked causes

1. Plate temperature exceeds safe limit (occasional)

First check

Measure all plate temperature sensors

Test point: Plate temperature sensors
Expected: ≤46°C

Therapy Alarm Test (TAT) detects leak patient safety

Alarm set when fluid leak detected by leak detection system

Ranked causes

1. Fluid leak in system (occasional)

First check

Inspect all connections and tubing for visible leaks

Test point: Leak detection sensor output
Expected: No leaks detected; dry status

Therapy Alarm Test (TAT) detects low blood flow patient safety

Alarm declared when measured blood flow <50 ml/min and >0.5 ml/min; heating disabled if flow <50 ml/min

Ranked causes

1. Blood flow rate below 50 ml/min (occasional)

First check

Measure blood flow rate

Test point: Flow sensor output
Expected: ≥50 ml/min for normal heating operation

Therapy Alarm Test (TAT) detects out-of-level condition caution

Alarm declared when blood warmer tilted >6° from level; second alarm at >21° tilt

Ranked causes

1. Device tilted beyond acceptable angle (occasional)

First check

Check device leveling using orientation sensor

Test point: Orientation sensor reading
Expected: Within ±6° of level

TherMax pairing status unclear patient safety

Determine current pairing state of TherMax with PrisMax to identify required actions.

Ranked causes

1. Unknown pairing history of TherMax (unknown)

First check

Determine if TherMax is new or previously installed

Test point: Device history or documentation
Expected: Installation status clearly identified

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

Error codes

Code	Meaning	Trigger	Severity
`0x0`	No malfunction detected	Normal operation	info
`0x03xxxx`	I2C error reading board revision	I2C communication failure reading board revision	error
`0x1`	Software not compatible with board revision	Software version mismatch with hardware	error
`0x1000x`	SPI bus post failure	SPI bus power-on self-test failure	critical
`0x1102x`	Triac update BIOT failure	Triac control built-in self-test failure	error
`0x11030`	Mains voltage zone difference BIOT failure	Mains voltage differential self-test failure	error
`0x1104x`	Mains voltage range BIOT failure	Mains voltage out-of-range self-test failure	error
`0x1105x`	Mains RMS voltage BIOT failure	Mains RMS voltage measurement self-test failure	error
`0x1106x`	Mains instant voltage BIOT failure	Mains instantaneous voltage measurement self-test failure	error
`0x1107x`	Mains power BIOT failure	Mains power monitoring self-test failure	error
`0x15`	Front blood leak sensor BIOT failure	Front leak sensor built-in self-test failure	error
`0x1500x`	Current leakage reduction self-test failure	Leakage current monitoring self-test failure	critical
`0x16`	Rear blood leak sensor BIOT failure	Rear leak sensor built-in self-test failure	error
`0x17`	Bag detect sensor 1 BIOT failure	Bag detector 1 built-in self-test failure	error
`0x18`	Bag detect sensor 2 BIOT failure	Bag detector 2 built-in self-test failure	error
`0x1Dxxxx`	I2C error for accelerometer sensor	I2C communication failure with accelerometer	error
`0x1E`	All on-board HCB I2C devices failed	All I2C devices on heater control board unresponsive	critical
`0x1F`	Inlet, outlet, and compensation I2C device failures	All three temperature sensor I2C devices failed	critical
`0x2`	3.3V power supply out of range	3.3V rail voltage outside specifications	error
`0x2000x`	Plate temperature sensor POST failure	Plate temperature sensor power-on self-test failure	error
`0x3`	5.0V power supply out of range	5.0V rail voltage outside specifications	error
`0x32`	Temperature sensors not in range or not consistent	Temperature sensor reading out of range or inconsistent	error
`0x33`	Power applied to heating elements when plate temps too high	Over-temperature condition during heating	critical
`0x34`	Power applied when outlet temp above 43C	Outlet temperature exceeds 43 degrees Celsius	critical
`0x35`	Power applied when outlet temp above setpoint by 1C	Outlet temperature exceeds setpoint plus 1 degree	critical
`0x38`	Controller failed to reach setpoint temperature	Temperature not reaching set value during normal operation	error
`0x3C`	Inlet zone power mismatch between commanded and measured	Inlet heating element power does not match expected value	error
`0x3D`	Outlet zone power mismatch between commanded and measured	Outlet heating element power does not match expected value	error
`0x3E`	Both inlet and outlet zone power mismatch	Both heating zones power mismatch detected	critical
`0x41xxxx`	I2C error for I/O bus extender	I2C communication failure with I/O expander	error
`0x48xxxx`	I2C error for inlet temperature sensor	I2C communication failure with inlet temp sensor	error
`0x49xxxx`	I2C error for outlet temperature sensor	I2C communication failure with outlet temp sensor	error
`0x4Axxxx`	I2C error for compensation temperature sensor	I2C communication failure with compensation sensor	error
`0x5`	Preventive maintenance past due	Maintenance interval exceeded	warning
`0x50xxxx`	I2C error for digital potentiometer	I2C communication failure with digital potentiometer	error
`0x6`	LRC shutdown protection circuit failure	Leakage reduction circuit failure	critical
`0x8`	FPGA CRC error	FPGA firmware CRC check failure	critical
`0x9`	FPGA diagnosed malfunction	FPGA self-test failure	critical
`0x9000`	Command to switch on membrane power switch failure	Membrane power switch activation failed	critical

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.