icetro IM-770-AF, Installation & Service Manual

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Service Fault Diagnosis
Type Cause Indicator Action to Take
Bin Full Storage bin is full of ice. ‘Full’ indicator light is on. None – Enjoy your ice!
Water Supply
Error
Water is not being supplied on time. ‘No Water’ indicator light is on.
Check water supply.
Check water reservoir is full.
Check operation of water level sensor.
Check operation of water dump valve.
Check water dump valve for leaks.
Evaporator Temp
Too High Error
Evaporator is not cold enough. ‘Temp’ indicator light flashes.
Check refrigerant charge (too low).
Check that compressor is running.
Check TXV operation.
Check S/L thermistor
Evaporator Temp
Too Low Error
Evaporator inlet temperature is too cold.
‘Temp’ & ‘Motor’ indicators flash
simultaneously every 2 seconds.
Unplug & plug back in after 1 hour.
Check TXV operation.
Check L/L thermistor.
Check liquid-line solenoid valve.
Check motor/gear box operation.
Low Condenser
Temp Error
Ambient temp is lower than 33.8°F.
‘Temp’ indicator flashes every
4 seconds.
Raise ambient temperature above
50°F.
High Condenser
Temp Error
Ambient temp is too high or condenser fails to cool
below 167°F.
‘Temp’ indicator light is on.
Lower ambient temperature.
Check air filter/condenser.
Check fan motor/blade.
Check fan cycle switch.
Check L/L thermistor
Locked Motor
Error
Motor is locked by foreign objects ‘Motor’ indicator light is on.
Unplug & plug back in after 1 hour.
Check motor/gearbox operation.
Check auger/agitator.
Check for ice jam.
Check for scale buildup.
S/L Thermistor
Error
Suction-line thermistor malfunctions.
‘Temp’ indicator light is on & ‘Motor’
indicator flashes.
Replace S/L thermistor.
L/L Thermistor
Error
Liquid-line thermistor malfunctions.
‘Temp’ indicator flashes & “Motor’
indicator light is on.
Replace L/L thermistor.
High Pressure
Error
Condenser fails to cool.
‘Temp’ and ‘Motor’ indicators lights
are both on simultaneously.
Check refrigerant charge (too high).
Check air filter/condenser.
Check fan motor/blade.
Check high pressure switch.
Check fan cycling switch.
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