Hyper hypothermia systems · Blanketrol family

Cincinnati Sub-Zero Blanketrol III 233: troubleshooting and error codes

The ServiceForge knowledge base holds 86 documented symptoms for the Cincinnati Sub-Zero Blanketrol III 233, with 150 ranked causes, 83 diagnostic checks with test points and expected values, and 21 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Water flow indicator does not move

Unit set to control mode but water is not circulating; flow indicator shows no movement

Ranked causes

1. Operator error; buttons not set correctly (common)
2. Defective pump (common)
3. Disengaged quick-disconnect fittings (common)
4. Kink in connecting hose or blanket (common)
5. Clogged water filter (occasional)
6. Clogged tubing of blankets (occasional)
7. Clogged couplings (occasional)

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

Blanket does not cool

Unit set to control mode but blanket does not cool to desired temperature

Ranked causes

1. Operator error; switches not set correctly (common)
2. Water not circulating (common)
3. Compressor running but not cooling (occasional)
4. Solenoid in-line fuse blown at J1 pin 11 (occasional)
5. Compressor not running (occasional)

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

Patient probe outside operating range patient safety

CHECK PROBE message displayed. Trouble alarm sounds. Unit shuts down in automatic mode. Patient display blank or out of range indicator active.

Ranked causes

1. Probe operating outside 30.0-43.5°C range (common)
2. Probe not connected to receptacle (common)
3. Probe dislodged from patient (common)
4. Probe defective or wrong type (occasional)
5. Patient temperature critically low or high (occasional)

First check

Verify probe connection

Test point: 1/4 inch receptacle
Expected: 400 Series probe firmly seated

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

Patient thermal injury (burns or frostbite) patient safety

Tissue damage to patient from excessive heating or cooling, particularly at skin contact areas

Ranked causes

1. Water temperature exceeds 40°C for extended period (common)
2. Therapy applied to ischemic or distal arterial cross-clamped limbs (rare)
3. Additional heat sources placed between patient and blanket (occasional)
4. Pressure and shearing forces from prolonged contact or improper positioning (common)
5. Transdermal medication patches warmed by therapy (occasional)

First check

Monitor water temperature continuously

Test point: Water Temperature display on unit
Expected: Not to exceed 40°C for extended periods; within physician-prescribed range

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

Probe inserted in automatic mode but PATIENT display goes blank and alarm sounds patient safety

Probe from patient connected; operating in automatic mode, PATIENT display goes blank, alarm sounds, Status Display reads CHECK PROBE or BAD PROBE

Ranked causes

1. Non-400 Series probe connected (common)
2. Probe dislodged from patient and sensing below 30°C (occasional)
3. Probe is defective (occasional)
4. Cable from receptacle to microprocessor board disconnected (occasional)
5. 1/4 inch receptacle is defective (rare)

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

Patient probe inserted but PATIENT display does not illuminate patient safety

Probe inserted from patient; in automatic mode, PATIENT display does not light and alarm does not sound

Ranked causes

1. Set Point is out of range 30–40°C (86–104°F) (common)
2. Probe is defective (occasional)
3. Cable from receptacle to microprocessor board disconnected (occasional)
4. 1/4 inch receptacle on side of unit is defective (occasional)

First check

Verify Set Point temperature is within range

Test point: temperature display
Expected: 30°C to 40°C (86°F to 104°F)

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

Blanket does not heat

Unit set to control mode but blanket does not heat to desired temperature

Ranked causes

1. Operator error; switches not set correctly (common)
2. Water not circulating (common)
3. Defective heater (common)

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

Blanket flow rate too low patient safety

LOW FLOW message displayed. Trouble alarm sounds. Flow drops below 6 ±3 GPH after previously acceptable flow detected.

Ranked causes

1. Blanket line kinked or obstructed (common)
2. Pump failure or wear (occasional)
3. Flow switch malfunction (occasional)

First check

Inspect blanket tubing for obstruction

Test point: Blanket inlet and outlet lines
Expected: Tubing straight and unobstructed, no kinks or clamps

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

Improper water type causing corrosion or mineral buildup caution

Plumbing system components corroded or clogged due to use of incorrect water type

Ranked causes

1. System filled with distilled or de-ionized water instead of sterile/filtered (occasional)
2. System filled with tap water containing minerals and deposits (occasional)
3. System filled with alcohol (rare)

First check

Verify water source and type before filling

Test point: Water container label and preparation documentation
Expected: Sterile water or water filtered through 0.22 micron filter documented

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

PATIENT display shows erratic reading patient safety

Unit operating in any mode; PATIENT display shows erratic or jumping temperature values

Ranked causes

1. Patient probe improperly attached to patient (common)
2. Patient probe is defective (occasional)
3. Microprocessor board is defective (occasional)

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

Status Display flashes SNAP DISC REMOVE FROM SERVICE and PATIENT shows EE02 patient safety

Unit operating in AUTOMATIC or MANUAL MODE; Status Display flashes SNAP DISC REMOVE FROM SERVICE and PATIENT display shows error code EE02

Ranked causes

1. Snap Disc high limit safety device triggered (occasional)
2. Snap disc needs replacement (occasional)
3. Pump not working (occasional)

First check

Water temperature when SNAP DISC triggered

Test point: water temperature sensor
Expected: 46.0°C +/- 2.0°C (114.8°F +/- 3.6°F)

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

Bacterial contamination and skin irritation or infection patient safety

Patient develops skin rash, irritation, or infection from contaminated equipment or solutions

Ranked causes

1. Inadequate sanitation or hygiene procedures (occasional)
2. Prep solutions allowed to remain on patient during prolonged procedure (occasional)

First check

Verify sanitation protocols are in place and followed

Test point: Unit and blanket cleanliness before use
Expected: Clean, disinfected per facility standards and GENTHERM guidelines

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

CHECK PROBE alarm activates during operation patient safety

System displays CHECK PROBE alarm and shuts down

Ranked causes

1. Patient temperature below 30.0°C (86°F) (common)
2. Probe disconnected or malfunctioning (occasional)

First check

Verify patient temperature reading

Test point: PATIENT display
Expected: Temperature above 30.0°C (86°F)

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

CHECK PROBE status message triggered unexpectedly patient safety

Status display shows CHECK PROBE message, preventing normal operation in automatic or monitor modes

Ranked causes

1. Probe not inserted or attached before control mode button pressed (common)
2. Probe dislodged or impacted during operation (occasional)

First check

Verify probe is physically inserted or attached to patient

Test point: Patient body (rectal, skin under arm/chest, or esophageal)
Expected: Probe fully seated and secure; no visible movement or disconnection

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

CHECK SETPT message flashes during operation

Status Display flashes CHECK SETPT for five minutes followed by alarm sound, indicating low water condition or power interruption

Ranked causes

1. Low water level in reservoir (common)
2. Power interruption (occasional)

First check

Inspect water level in reservoir

Test point: Reservoir sight glass or fill port
Expected: Water level within normal operating range

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

Incorrect temperature readings or inadequate treatment patient safety

Probe readings are inaccurate resulting in wrong therapy parameters or insufficient temperature control

Ranked causes

1. Non-approved or incorrect probe type installed (occasional)
2. Electrostatic discharge damage to probe (occasional)

First check

Verify probe type and part number

Test point: Probe connector label
Expected: YSI 400 Series or equivalent per Table 6-8

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

Low water level alarm during operation patient safety

Status display flashes LOW WATER, alarm sounds, unit shuts down during water circulation test

Ranked causes

1. Insufficient water in reservoir (common)
2. Water clogging from improper water type (occasional)

First check

Verify water level in reservoir

Test point: Water fill opening strainer
Expected: Water reaches visible strainer at bottom of opening

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

Microprocessor board or membrane control panel malfunction high voltage

Control panel not responding; display not functioning; buttons unresponsive; incorrect operation control

Ranked causes

1. Microprocessor board failure or component damage (unknown)
2. Membrane control panel failure or display damage (occasional)

First check

Verify all connector cables aligned and fully seated on microprocessor board

Test point: 11-pin connector (J7 position) and all signal cables
Expected: All connectors fully seated with no gaps

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

Power switch on but membrane control panel blank high voltage

Power switch set to ON and illuminates, but membrane control panel is blank or inoperable

Ranked causes

1. Transformer is defective (occasional)
2. Microprocessor board is defective (occasional)

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

Probe inserted in MANUAL CONTROL MODE but PATIENT display does not illuminate patient safety

Probe from patient connected; operating in MANUAL CONTROL MODE, PATIENT display does not light and alarm does not sound

Ranked causes

1. Patient temperature is not within appropriate range (common)
2. Probe is broken or defective (occasional)

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

Probe inserted in MONITOR ONLY MODE but PATIENT display does not illuminate patient safety

Probe from patient connected; operating in MONITOR ONLY MODE, PATIENT display does not light and alarm does not sound

Ranked causes

1. Non-400 Series probe connected to receptacle (common)
2. Patient temperature is not within appropriate range (common)

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

Probe reading out of valid range in AUTO CONTROL mode patient safety

Status display flashes CHECK PROBE or CHECK SETPT, alarm sounds when attempting AUTO CONTROL mode

Ranked causes

1. Patient probe not attached or reading below 30°C or above 43.5°C (common)
2. Set point outside automatic control temperature range (common)

First check

Verify probe attachment and temperature reading

Test point: 400 Series probe receptacle and patient contact
Expected: Probe reading between 30°C–43.5°C (86°F–110.3°F)

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

Snap disc opens or is disconnected patient safety

Trouble alarm sounds. EE02 displays in patient temperature display. Heater, compressor and pump turn off. Unit displays SNAP DISC REMOVE FROM SERVICE.

Ranked causes

1. Snap disc open or disconnected (common)
2. Reservoir temperature exceeds 46°C (occasional)

First check

Verify snap disc physical connection

Test point: Snap disc connector
Expected: Snap disc firmly connected

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

Status Display flashes HIGH LIMIT REMOVE FROM SERVICE patient safety

Unit operating in AUTOMATIC or MANUAL MODE; Status Display continuously flashes HIGH LIMIT REMOVE FROM SERVICE

Ranked causes

1. High Limit Safety device triggered due to defective control (occasional)
2. Water not circulating due to clogged bypass (occasional)

First check

Water temperature when HIGH LIMIT triggered

Test point: water temperature sensor
Expected: 44.0°C +/- 2.0°C (111.2°F +/- 3.6°F)

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

Status Display flashes LOW LIMIT REMOVE FROM SERVICE patient safety

Unit operating in control mode; Status Display flashes LOW LIMIT REMOVE FROM SERVICE

Ranked causes

1. Backup low limit safety device triggered due to defective board or sensor (occasional)
2. Water temperature sensor is defective (occasional)

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

System does not start after power switch activation

Power switch pressed to I position but system does not proceed through startup sequence

Ranked causes

1. Probe not properly connected to receptacle (common)
2. Microprocessor board failure (rare)

First check

Verify probe connection

Test point: 1/4 inch receptacle on right side of unit
Expected: Probe fully seated and secure

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

Thermal disc over temperature device malfunction

Over temperature protection not functioning; thermal disc needs replacement or maintenance

Ranked causes

1. Thermal disc failure or degradation (unknown)
2. Corroded or loose connector terminals (occasional)

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

Tissue damage or burns from excessive water temperature patient safety

Patient skin develops burns, frostbite, or other tissue injury from heating or cooling blanket in contact with patient skin

Ranked causes

1. Water temperature exceeds safe maximum for extended periods (common)
2. Inadequate monitoring of patient skin integrity (occasional)

First check

Measure water temperature

Test point: WATER display on unit
Expected: Below 40°C, <40°C for extended periods

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

Tissue damage or burns from prolonged high temperature exposure patient safety

Patient develops burns, tissue damage, or other thermal injury from blanket contact at excessive temperature

Ranked causes

1. Water temperature set above 40°C for extended period (common)
2. Inadequate skin checks during therapy (common)

First check

Verify water temperature setting

Test point: WATER display
Expected: Water temperature does not exceed 40°C (104°F) without medical justification

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

Unit does not power on high voltage

Power switch set to ON position but does not light; membrane control panel is blank

Ranked causes

1. Unit is unplugged (common)
2. No line voltage (common)

First check

Verify power cord plugged into hospital-grade receptacle

Test point: power receptacle
Expected: power cord firmly connected to grounded outlet

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

Unit not operating after power loss caution

Power fail alarm activates and Power fail symbol LED flashes on control panel after unexpected power removal

Ranked causes

1. Power removed without using power switch (occasional)
2. Unit powered off for more than 5 seconds (occasional)

First check

Verify power supply is connected and stable

Test point: Power receptacle and plug connection
Expected: Unit powered with no audible alarm

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

Water circulation does not begin after GRADIENT 10C button pressed patient safety

System configured but water does not flow to blanket after GRADIENT 10C button activation

Ranked causes

1. Pump not activated (common)
2. Blanket or water lines blocked or disconnected (common)

First check

Observe water flow indicator movement

Test point: Water flow indicator on right-side panel
Expected: Indicator begins to move after GRADIENT 10C button pressed

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

WATER display shows erratic reading

Unit operating in MANUAL CONTROL MODE or automatic mode; WATER display shows erratic temperature values

Ranked causes

1. Water temperature sensor is defective (common)
2. Microprocessor board is defective (occasional)

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

Water flow indicator assembly malfunction caution

Water flow indicator not functioning; needs cleaning or replacement; may indicate blockage or sensor failure

Ranked causes

1. Debris or mineral buildup in indicator (common)
2. Water flow indicator seal failure or internal damage (occasional)

First check

Inspect water flow visually through indicator window

Test point: Water flow indicator assembly
Expected: Clear water flow visible in indicator

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

Water leakage from unit, hose, or blanket high voltage

Water leaks into or around unit, connecting hose, or blanket creating slip hazard and electrical shock risk

Ranked causes

1. Blanket or hose puncture or damage (occasional)
2. Improper water level or overflow (occasional)

First check

Turn off unit and disconnect power

Test point: Main power switch and wall outlet
Expected: Unit powered off and unplugged

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

Water leaking from unit, hose, or blanket patient safety

Visible water leaking into or around unit, connecting hose, or blanket during operation or setup

Ranked causes

1. Loose or improperly connected couplings (common)
2. Damaged blanket or hose (occasional)

First check

Inspect coupling connections

Test point: Quick-disconnect fittings at unit and blanket
Expected: Couplings fully engaged with collars snapped in place

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

Water reservoir level too low patient safety

LOW WATER message scrolls with REPLENISH RESERVOIR instruction. Trouble alarm sounds. Low water LED flashes. Heater, compressor and pump turn off. Seven-segment displays blank.

Ranked causes

1. Reservoir water level below preset (common)
2. Float switch defective (occasional)

First check

Observe reservoir water level visually

Test point: Reservoir sight glass or fill port
Expected: Water level above float switch minimum

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

Water temperature exceeds high safety threshold patient safety

Unit shuts down, Status Display flashes 'HIGH LIMIT REMOVE FROM SERVICE', trouble alarm sounds when water reaches or exceeds 44.0°C

Ranked causes

1. Primary high temperature limit reached (common)
2. Microprocessor control failure, backup safety engaged (rare)

First check

Verify water temperature at which high limit activated

Test point: Status Display and temperature sensor reading
Expected: 44.0°C ± 2.0°C (111.2°F ± 3.6°F), ± 2.0°C

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

Water temperature falls below low safety threshold patient safety

Unit shuts down, Status Display indicates 'LOW LIMIT REMOVE FROM SERVICE', trouble alarm sounds when water reaches or falls below 2.0°C

Ranked causes

1. Primary low temperature limit reached (common)
2. Microprocessor control failure, backup safety engaged (rare)

First check

Verify water temperature at which low limit activated

Test point: Status Display and temperature sensor reading
Expected: 2.0°C ± 2.0°C (35.6°F ± 3.6°F), ± 2.0°C

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

Water temperature sensor fault patient safety

Sensor open or shorted. Trouble alarm sounds continuously. Seven-segment displays blank. SENSOR FAULT REMOVE FROM SERVICE message displayed.

Ranked causes

1. Water temperature sensor open or shorted (occasional)
2. Temperature out of readable range (occasional)

First check

Measure water temperature sensor resistance

Test point: Sensor terminals
Expected: Resistance within 0-52°C range

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

Automatic mode shutdown at low patient temperature patient safety

Device shuts down and activates CHECK PROBE alarm when patient temperature falls below 30°C

Ranked causes

1. Patient temperature fell below 30.0°C (86°F) (occasional)

First check

Verify patient temperature above threshold

Test point: Patient Display or probe reading
Expected: Patient temperature above 30.0°C (86°F)

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

Beeper assembly malfunction

Beeper not sounding; alarm not audible; beeper assembly damaged or disconnected

Ranked causes

1. Beeper assembly failure or loss of power connection (unknown)

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

Blanket overfilled causing overflow caution

Water overflows when blanket drains back into system after unit is turned off

Ranked causes

1. Reservoir filled above recommended level (occasional)

First check

Verify proper reservoir fill level

Test point: Water fill opening strainer
Expected: Water visibly touching strainer; reservoir not overfilled above this point

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

Control panel switches do not stay set

Unit on; pressed switches do not remain set, or operating mode changes cause switches to snap on, or TEMP SET switch activation causes other switches to snap on

Ranked causes

1. Membrane switch has failed (common)

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

Displays flicker and Status Display shows CHECK SETPT or SENSOR FAULT

Unit in control mode; when cycling to Cool mode, all displays flicker on/off, unit shows CHECK SETPT, SENSOR FAULT REMOVE FROM SERVICE, or HIGH LIMIT REMOVE FROM SERVICE

Ranked causes

1. Low line voltage or power source (common)

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

Electromagnetic interference affecting unit operation caution

Unit or adjacent equipment operating abnormally; potential interference from nearby devices such as ventilators, monitors, anesthesia equipment

Ranked causes

1. Unit placed adjacent to or stacked with other electronic equipment (occasional)

First check

Verify distance from other electronic equipment

Test point: Space around BLANKETROL III unit and all nearby devices
Expected: Unit positioned per Section 7 separation distance requirements; complies with IEC 60601-1-2

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

Electrostatic discharge damage to 400 Series Probe or unit high voltage

Probe or microprocessor board damaged due to electrostatic discharge when probe is connected without proper grounding

Ranked causes

1. Operator body electrostatically charged during probe connection (occasional)

First check

Verify operator is grounded before probe connection

Test point: Operator body contact with unit frame
Expected: Operator has discharged static electricity

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

Electrostatic discharge damage to probe or circuit board high voltage

Probe does not function or circuit board malfunction after probe connection without proper grounding

Ranked causes

1. Technician or operator not grounded before probe connection (common)

First check

Verify operator grounding procedure

Test point: Operator body contact with unit frame or ground
Expected: Operator grounded before probe contact

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

Flow switch stuck closed caution

CHECK FLOW SWITCH message displayed. Audible alarm sounds continuously for 30 seconds at power-up. Message clears after alarm stops. Unit remains operable but LOW FLOW alarm will not trigger.

Ranked causes

1. Flow switch stuck or mechanically seized (occasional)

First check

Listen for continuous alarm at power-up

Test point: Speaker or audible output
Expected: Alarm sounds 30 seconds then stops; message clears

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

Gradient 10C Smart mode configured without Smart mode enabled patient safety

Gradient 10C or Gradient Variable mode activated without Smart mode, risking unintended therapy

Ranked causes

1. Smart mode not enabled while using Gradient mode (rare)

First check

Verify Smart mode status when using Gradient mode

Test point: Operating mode display or mode selection buttons
Expected: Smart mode indicator shows enabled when Gradient mode is active

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

I/O power switch malfunction high voltage

Power switch not responding to on/off commands; may be stuck, loose, or internally damaged

Ranked causes

1. Power switch internal failure or wear (unknown)

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

Leakage current excessive high voltage

Electrical leakage current exceeds safe limits; potential shock hazard; unit needs electrical isolation testing

Ranked causes

1. Leakage current exceeds threshold (>300µA at 115V or >500µA at 230V) (rare)

First check

Measure leakage current in normal polarity, power ON

Test point: Leakage current tester input lead to unit ground point
Expected: Less than 300 microamps (115V) or less than 500 microamps (230V), <300µA at 115V; <500µA at 230V
Tools: Electrical safety analyzer

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

Patient probe short circuit patient safety

BAD PROBE message displayed. Trouble alarm sounds. Unit shuts down. Patient display blanks in automatic modes.

Ranked causes

1. Patient probe shorted (occasional)

First check

Measure patient probe resistance

Test point: Probe terminals at connector
Expected: Open circuit or high resistance (not short)

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

Patient temperature falls below 30.0°C in automatic mode patient safety

Device shuts down and activates CHECK PROBE alarm when patient temperature drops below 30.0°C (86°F); therapy is interrupted

Ranked causes

1. Patient core temperature hypothermic (below 30.0°C) (unknown)

First check

Verify patient temperature display reading

Test point: Patient display
Expected: Above 30.0°C (86°F), >30.0°C

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

Patient temperature falls below safe minimum during automatic operation patient safety

Device shuts down and activates CHECK PROBE alarm when patient temperature drops below 30.0°C (86°F)

Ranked causes

1. Patient temperature drops below 30.0°C (86°F) in automatic mode (occasional)

First check

Verify patient temperature reading

Test point: Patient probe temperature display
Expected: Above 30.0°C (86°F)

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

Power cord malfunction or replacement high voltage

Power cord damaged, frayed, or not connected properly; unit not receiving power or intermittent power loss

Ranked causes

1. Power cord damaged, insulation compromised, or connections loose (occasional)

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

Power cord or plug damaged high voltage

Cuts or exposed wires on power cord, bent or missing prongs on plug

Ranked causes

1. Shipping damage or storage damage (rare)

First check

Inspect power cord and plug

Test point: Power cord and plug assembly
Expected: No cuts, exposed wires, bent prongs, or missing prongs

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

Power failure alarm activates on startup

Power fail symbol LED flashes and alarm sounds when unit powered on

Ranked causes

1. Power removed without actuating I/O switch (common)

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

Power failure during operation patient safety

Unit reverts to CHECK SET POINT mode and stops providing therapy to patient when power is interrupted

Ranked causes

1. Power supply interrupted or lost (occasional)

First check

Verify unit power status and mode display

Test point: Main power indicator and display screen
Expected: Unit powered and displaying active therapy mode (not CHECK SET POINT)

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

Power switch snaps to OFF position high voltage

Each time unit is set to ON position, it immediately snaps to OFF position

Ranked causes

1. Circuit breaker is defective or tripped (common)

First check

Measure amperage at power switch

Test point: power switch
Expected: reading less than 15 amperes or greater than 15 amperes

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

More symptoms

Preventative maintenance interval reached
Probe temperature reading below 30°C (86°F)
Processor mismatch detected
Refrigerant system check
Sensor fault detected
Status Display does not show CHECK SETPT message after power on
Status Display flashes CHECK SETPT
Status Display flashes SENSOR FAULT REMOVE FROM SERVICE
Status display lights but buttons inoperable
Status Display shows CHECK SETPT at startup
Temperature display not accurate or jumps
Test indicator button malfunction or display verification
TEST INDICATOR shows atypical display pattern
TEST INDICATORS button: part of display does not light
Thermostatic snap disc activates
Unable to connect 400 Series probe without ESD damage risk
Unintended therapy in gradient modes without Smart Mode
Unit does not enter automatic control mode
Unit does not power on after unpacking
Unit overheating or inadequate therapy delivery
Unit shipped on its side
Visible shipping damage on arrival
Water level low or below preset
Water level sensor assembly malfunction
Water temperature exceeds high limit
Water temperature falls below low limit

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

Error codes

Code	Meaning	Trigger	Severity
`BAD PROBE`	Patient probe short circuit detected during automatic operation	Direct short detected in patient probe circuit	error
`CHECK FLOW SWITCH`	Flow switch stuck closed at power-up indicating mechanical failure	Flow switch closed during initial power-up test	warning
`CHECK PROBE`	Probe not properly connected or probe failure detected during automatic mode operation	Patient temperature falls below 30.0°C (86°F) or probe signal lost	error
`CHECK PROBE`	Patient probe fault: disconnected, out of range, defective, or wrong type	Multiple conditions: probe out of range 30-43.5°C, not connected, dislodged, defective, or non-400 Series	error
`CHECK SET POINT`	Device has reverted to standby after power interruption; no therapy is being delivered	Main power supply is lost or interrupted	critical
`CHECK SETPT`	Set Point temperature is not configured before operation in automatic control mode	Power switch pressed to ON; system boots and waiting for set point configuration	warning
`EE01`	Backup processor and primary processor mismatch	Processors disagree during operation	critical
`EE02`	Emergency thermal snap disc has activated due to extreme high temperature	Reservoir water temperature reaches 46.0°C ± 2.0°C (114.8 ± 3.6°F)	critical
`HIGH LIMIT`	Water temperature has reached 44.0°C ± 2°C (111.2°F ± 3.6°F)	Temperature sensor or control detects high limit	critical
`HIGH LIMIT REMOVE FROM SERVICE`	Water temperature exceeded high safety threshold (44.0°C or higher)	Water temperature reaches 44.0°C ± 2.0°C (111.2°F ± 3.6°F) via primary control or backup safety device	critical
`HIGH LIMIT (Software failure)`	Water temperature reached 44.0°C ± 2°C with independent safety active (software fault)	Software failure combined with high temperature condition	critical
`LOW FLOW`	Blanket flow rate dropped below 6 ± 3 GPH after previously acceptable flow	Flow sensor detects drop below minimum after initial acceptable flow	warning
`LOW LIMIT`	Water temperature has reached 2.0°C ± 2°C (35.6°F ± 3.6°F)	Temperature sensor or control detects low limit	critical
`LOW LIMIT REMOVE FROM SERVICE`	Water temperature fell below low safety threshold (2.0°C or lower)	Water temperature reaches 2.0°C ± 2.0°C (35.6°F ± 3.6°F) via primary control or backup safety device	critical
`LOW LIMIT (Software failure)`	Water temperature reached 2.0°C ± 2°C with independent safety active (software fault)	Software failure combined with low temperature condition	critical
`LOW WATER`	Reservoir water level below preset or float switch defective	Float switch senses low water level	error
`PM REQUIRED`	500-hour preventative maintenance interval has elapsed	Operating hours counter exceeds 500 hours since last PM reset	info
`SENSOR FAULT`	Water temperature sensor is open, shorted, or out of readable range	Sensor open/short detected or temperature out of 0-52°C range	critical
`SENSOR FAULT REMOVE FROM SERVICE`	Water temperature sensor has failed or is not communicating	Water temperature sensor fails or loses continuity to microprocessor	error
`SNAP DISC / EE02`	Thermostatic snap disc open, disconnected, or reservoir temperature exceeded 46°C ± 2°C	Snap disc opens or temperature exceeds 46°C	critical
`SNAP DISC REMOVE FROM SERVICE`	Emergency thermal snap disc activated at extreme high temperature (46.0°C)	Reservoir water temperature reaches 46.0°C ± 2.0°C (114.8 ± 3.6°F)	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.