Refrigeration Trouble Shooting Chart - Refrigerator - True GDM Series Technical & Service Manual

REFRIGERATION TROUBLESHOOTING CHART
Refrigerator
PROBLEM Cabinet is running warm.
1. Are lights and evaporator fan working?
NO Check to make sure cabinet is plugged in, check to make sure circuit breaker is not tripped, check to see
if temperature control is set on #5.
YES Remove the grill covering the condensing unit.
2. Is the condenser coil (looks like a car radiator) clean? If not clean this with a brush and either a vacuum
or condensed air. Wait and let the cabinet run with a clean coil and see if that solves problem.
(CONDENSER COILS SHOULD BE CLEANED MONTHLY)
3. Can you here the compressor and condenser fan motor running?
NO Check the voltage at the compressor receptacle. It should be 115 volts ± 10%. Using a remote reading
thermometer, check the evaporator coil temperature. If the temperature control is set on #5 and the coil tem-
perature is above 40 degrees the control should be closed calling for the compressor to run. If the coil tem-
perature is above 40 degrees and the temperature control does not close.
A. remove the temperature control from the evaporator housing and either calibrate or replace control.
• Verify on yourwiring diagram but most models have a pink wire that is connected to the power c o r d
black wire in the electrical box. This feeds one side of the temperature control and the other p i n k
w i re is connected to the other side of the control to bring power to the compre s s o r receptacle when
the switch closes on a call for refrigeration.
YES Is the evaporator coil frozen? Check to see if temperature control is operating correctly. If the evapo-
rator coil is not iced up and the compressor and condenser fan is running please install piercing valves on
both the suction and discharge process tubes.
1. If pressures are equalized (high suction pressure, low head pressure) and compressor is running low amp
draw, compressor has bad valves replace compressor.
2. If you have low suction pressure and low discharge pressure first check to make sure there are no kinks
in the compressor pullout or the suction line after doing this you have a few options.
A. Add a few ounces of refrigerant and see what happens.
B. Recover charge and weigh in correct amount of refrigerant.
REFRIGERATION TROUBLESHOOTING CHART
(REFRIGERATOR)
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