Blood warmers

ThermoGenesis ThermoLine: troubleshooting and error codes

The ServiceForge knowledge base holds 17 documented symptoms for the ThermoGenesis ThermoLine, with 32 ranked causes, 45 diagnostic checks with test points and expected values, and 3 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Unit completely inoperative

Thawer does not power on or respond; no lights or operation

Ranked causes

1. Circuit breaker on wall is tripped (common)
2. Thawer is not plugged into wall outlet (common)
3. GFCI is tripped (if equipped) (occasional)
4. Circuit breaker on back of thawer is tripped (occasional)

First check

Verify wall outlet circuit breaker status

Test point: wall outlet circuit breaker
Expected: breaker not tripped

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

Unit not heating high voltage

Thawer plugged in and powered but bath temperature does not rise

Ranked causes

1. Faulty fuse (common)
2. Defective thermal fuse (occasional)
3. No voltage at heater connector (occasional)
4. Defective heater (rare)

First check

Inspect heater fuse

Test point: fuse holder on back power panel
Expected: fuse not blown

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

Low fluid level patient safety

Low fluid warning displayed; thawer disabled until reset; damage risk to pumps and heater

Ranked causes

1. Water level below recommended operating level (common)
2. Ground wire disconnected or damaged (occasional)
3. Corroded level probe or level sensor screw (occasional)

First check

Inspect water reservoir level

Test point: product chamber water level
Expected: water at recommended operating level

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

Low fluid warning caution

Display shows 'LOW FLD', equipment may be disabled after thaw cycle or at rest

Ranked causes

1. Low fluid level (common)
2. Ground problem (rare)
3. Corroded level probe (rare)

First check

Inspect water level in reservoir

Test point: Reservoir sight glass or fill level indicator
Expected: Water level at or above minimum safe operating level

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

Unit overheating caution

Display flashes 'OVER TEMP', equipment becomes disabled

Ranked causes

1. Incorrectly calibrated operating temperature (common)
2. Control panel failure (occasional)
3. Heater failure (occasional)

First check

Verify operating temperature setting

Test point: Operating temperature/error message display
Expected: Current operating temperature setting displayed during set operation

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

Unit overheating (overtemp) patient safety

Unit enters overtemp condition and becomes disabled; temperature control failure

Ranked causes

1. Incorrectly calibrated operating temperature (common)
2. Back power panel failure (occasional)
3. Heater failure (shorted) (occasional)

First check

Verify calibrated operating temperature

Test point: front control panel
Expected: temperature calibration correct per Chapter 5 verification procedure

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

Unit not draining (MT204)

Drain pump does not empty chamber; water remains after cycle

Ranked causes

1. Defective drain pump (common)
2. Obstruction in drain line or pump pickup (occasional)

First check

Measure voltage at drain pump connector during drain cycle

Test point: two outside pins of drain pump connector on back power panel
Expected: voltage present (per specifications)
Tools: voltmeter

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

Calibration: Operating temperature control panel caution

Adjust control panel reading to match actual water temperature after servicing or for regular calibration

Ranked causes

1. Control panel requires calibration adjustment (common)

First check

Measure actual water temperature in thawer

Test point: Thawer chamber
Expected: Verify actual temperature reading

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

Calibration: Operating temperature verification

Periodic verification of temperature display calibration against NIST-calibrated thermometer, recommended quarterly or per internal procedures

Ranked causes

1. Routine calibration verification required (common)

First check

Locate temperature verification probe

Test point: Front left corner of deck: button cap (MT202/MT204) or button cap on manual drain knob (MT210)
Expected: Button cap located and accessible

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

Calibration: Overtemp error code verification

Periodic verification that OVER TEMP error code triggers correctly at 37.2°C, recommended every six months

Ranked causes

1. Routine overtemp error verification required (common)

First check

Verify thawer at operating temperature before test

Test point: Operating temperature/error message display
Expected: Temperature between 34.5 and 35.5°C

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

No agitation

Gear motor does not run; product in chamber is not agitated

Ranked causes

1. Gear motor problem, back power panel failure, or software issue (unknown)

First check

Inspect gear motor fuse

Test point: gear motor fuse on back power panel
Expected: fuse not blown

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

Operating temperature display does not match calibrated thermometer

Temperature shown on operating temperature/error message display differs from reading on NIST-calibrated thermometer during verification cycle

Ranked causes

1. Temperature calibration drift or initial miscalibration (common)

First check

Place calibrated thermometer in temperature probe tube

Test point: Button cap tube (MT202/MT204) or manual drain knob (MT210)
Expected: Thermometer inserted without forcing past thermotube boot
Tools: 12-inch thermometer calibrated to NIST standard

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

Overtemp error displayed with audible alarm patient safety

Equipment displays OVER TEMP error message and emits audible alarm during operation or temperature verification

Ranked causes

1. Bath temperature exceeds 35.5°C setpoint (common)

First check

Verify current bath temperature using calibrated thermometer

Test point: Button cap tube (MT202/MT204) or manual drain knob (MT210)
Expected: Between 34.5 and 35.5°C
Tools: 12-inch thermometer calibrated against NIST thermometer

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

Thaw cycle does not complete

Timer does not countdown or display does not show 'DRN' at end of cycle

Ranked causes

1. Incorrect thaw cycle time set (common)

First check

Verify thaw cycle time setting

Test point: Time/function display
Expected: Display shows set thaw cycle time matching bag size (1200 for 250ml plasma, 3500 for 450ml RBCs)

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

Unit not circulating (MT210)

Circulation pump does not run; no fluid circulation in bath

Ranked causes

1. Defective circulation pump (common)

First check

Measure voltage at circulation pump connector

Test point: two outside pins of circulation pump connector on back power panel
Expected: voltage present (per specifications)
Tools: voltmeter

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

Unit not filling

Fill pump does not work; water does not enter chamber

Ranked causes

1. Defective fill pump (common)

First check

Verify fuse for fill pump is not blown

Test point: appropriate fuse on back power panel
Expected: fuse not blown

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

Verification After Servicing Thawers caution

Perform post-service verification steps to ensure thawer operates properly after maintenance

Ranked causes

1. Service verification required after maintenance (common)

First check

Fill thawer with proper amount of water

Test point: Thawer chamber
Expected: Filled to proper level

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

Error codes

Code	Meaning	Trigger	Severity
`LOW FLD`	Low fluid warning	Water level in reservoir below recommended operating level	warning
`OVER TEMP`	Unit overheating condition	Water reservoir temperature exceeds 37.1°C setpoint	error
`OVER TEMP`	Bath temperature exceeds safe upper limit of 35.5°C	Operating temperature rises above 35.5°C or is manually set above this threshold during calibration mode	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.