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AUTOMATIC DEFROST TROUBLE SHOOTING GUIDE
If refrigerant valves must be opened, a qualified technician should be notified to perform the work.
PROBLEM
POSSIBLE CAUSE
SOLUTION
Ice is melting
Power switch is in OFF position.
Ice bags are blocking air flow.
Condenser coil is dirty.
Incorrect refrigerant charge.
Condenser fan motor and
compressor are not running.
Condenser fan motor is not
operating.
Compressor is not operating.
Evaporator fan motor not running.
Check for ice build-up on the
evaporator coil.
Thermostat setting.
Evaporator fan motors are operating
but the fan blade not turning
.
Turn switch to ON position
Move ice bags accordingly.
Clean condenser.
Check sight glass when used for bubbles indicating
wrong charge. Add refrigerant. Locate refrigerant
leak.
Check power supply.
Check if defrost timer (mechanical controls) is stuck
in defrost mode.
Check if compressor is hot, this may indicate that
condenser fan motor has failed causing thermal
overload on compressor to trip.
Check electrical power to motor.
Check electrical power to motor.
Check electrical power, relay, overload protector,
start capacitor and compressor motor.
Check power supply to motor Check for faulty fan
motor.
Check power to defrost heater.
Check defrost heater for heat.
Check defrost termination thermostat.
Check defrost timer.
Normal setting is between 4 and 6 on the dial. Jump
terminals on thermostat to check, if unit starts,
replace thermostat.
Check to see if fan blade is slipping on the motor
shaft.
Summary of Contents for POLAR TEMP 1000AD
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