3M Bair Hugger 675, Service Manual

Page: 15 / 332

English / 34-8720-2487-1
11
Troubleshooting
The warming unit software routinely checks unusual operating conditions. If such a condition occurs, the system may trigger a fault condition and alarm. The warming unit can be
reset by disconnecting the warming unit from the main power source and allowing 30-60 seconds for the system to reset. If the fault code condition reoccurs, disconnect again
and wait 5 minutes for the system to reset. If the fault condition reoccurs upon connection to the main power source, the warming unit may have a hard-fault or permanent error.
If the fault does not reoccur upon connection to the main power source, the warming unit may have a cautionary fault.
Fault Code Fault Condition Possible Cause Troubleshooting
01 Control sensor output
is high 1. Sensor board failure.
2. Control board failure.
3. Internal wire harness failure. 1. Check for moisture on sensor.
2. Perform the 43C test in the
System Test option of the Diagnostic Menu .
Verify the end of hose temperature is 43°C ± 3°C using the Model
22110 temperature test unit and calibrated thermocouple meter.
02 Control sensor measures ≥
47°C for 30 seconds
1. Control board failure.
2. AC board failure (TRIAC).
3. Sensor board failure.
4. Internal wire harness failure. 1. Perform Operating Temperature calibration.
2. Measure the hose end temperature using the Model 22110 temperature
test unit and calibrated thermocouple meter while running in Ambient
mode. The measured temperature should be ±3°C of the ambient
room temperature.
03 Monitor sensor output
is high 1. Sensor board failure.
2. Control board failure.
3. Internal wire harness failure.
1. Check for moisture on sensor.
2. Perform the 43C test in the System Check option of the
Diagnostic
Menu . Verify the end of hose temperature is 43°C ± 3°C using the Model
22110 temperature test unit and calibrated thermocouple meter.
04 Software detects an
over-temperature
circuit cutout
1. Control board failure.
2. Sensor board failure.
3. Internal wire harness failure. 1. Perform Operating Temperature calibration.
2. Measure the hose end temperature using the Model 22110 temperature
test unit and calibrated thermocouple meter while running in Ambient
mode. The measured temperature should be ±3°C of the ambient
room temperature.
50 Software detects any button
pressed for 5 seconds. 1. User action.
2. User interface circuit board failure. 1. Reset microprocessor by disconnecting the warming unit from the main
power source and allowing 30-60 seconds for the system to reset.
51 The blower is running at ≤
2000 RPM for 1 minute, or
there is no output to the
control board for 3 seconds
1. Blower failure.
2. Control board failure.
3. Internal wire harness failure. 1. Test blower using the System Info screen in Diagnostic mode.
52 Watchdog timer failed 1. Control board failure. 1. Reset microprocessor by disconnecting the warming unit from the main
power source and allowing 30-60 seconds for the system to reset.
70 The control sensor measures
the temperature to be +3°C
greater than the set point for
3 minutes.
1. Control board failure.
2. Air flow occlusion. 1. Check hose for obstructions.
2. Check the air intake on the bottom of the unit for obstructions.
3. Check for blocked filter.
4. Test all 3 heater wattages using the
System Test screen in the
Diagnostic Menu .
71 The control sensor measures
the temperature to be -3°C
less than the set point for
3 minutes.
1. Air flow occlusion.
2. Heater failure.
3. Control board failure.
4. Internal wire harness failure. 1. Check for hose obstructions.
2. Check the air intake on the bottom of the unit for obstructions.
3. Check for blocked filter.
4. Test all 3 heater wattages using the
System Test screen in Diagnostic mode.
72 The outlet temperature
does not increase at
expected rate 1. Air flow occlusion.
2. Heater failure.
3. Control board failure.
4. Internal wire harness failure. 1. Check for hose obstructions.
2. Check the air intake on the bottom of the unit for obstructions.
3. Check for blocked filter.
4. Test all 3 heater wattages using the
System Test screen in Diagnostic mode.
73 Control and monitor sensors
differ by more than 3°C for
30 seconds. 1. Sensor board failure.
2. Internal wire harness failure.
3. Control board failure. 1. Check for moisture on sensor.
2. Perform the 43C test in the System Check option of the Diagnostic
Menu. Verify the end of hose temperature is 43°C ± 3°C using the Model
22110 temperature test unit and calibrated thermocouple meter.
Technical Support and Order Placement
When you call for Technical Support
We will need to know the serial number of your Bair Hugger warming unit when you
call us. The serial number label is located on the back of the warming unit.
USA:
• Call 3M Technical Support at 800-733-7775
Outside of the USA:
• Contact your local 3M representative
In-Warranty Repair and Exchange
USA
• Call 3M technical support at 800-733-7775 if your warming unit requires
factory service.
• Provide the serial number located on the back of the warming unit.
• Technical Support will give you a Return Authorization (RA) number. Use this RA
number on all correspondence. Your Technical Support representative will also
send a shipping carton to you at no charge, if needed.
Outside of the USA
• Contact your local distributor concerning in-warranty repair and exchange.
Provide the serial number located on the back of the Bair Hugger warming unit
when you call.