April 1998 39 RS590000 Rev. 0
Component Testing
Fusible link Fusible link is part of evaporator heater
wiring harness and is in a series circuit
with defrost terminator, defrost heater,
and evaporator fan motor.
If the defrost terminator fails to open and
temperature increases to fusible link,
fuse will open breaking circuit so defrost
heater will be shut down.
If fusible link interrupts opens, evaporator heater wiring harness must be
replaced.
Be sure harness is wire tied against evaporator heater over white mark on
evaporator heater.
Heater, door Applied to back of ice and water cavity to
help prevent condensation from forming
on face of cavity.
Some models have spare heater foamed in place at factory. See tech sheet for
model being serviced.
Check resistance across heater (for resistance values see tech sheet for model
being serviced).
Heater, evaporator
(defrost)
Activated when defrost thermostat or
adaptive defrost control completes the
circuit through the heater.
Check resistance across heater.
To check defrost system
1. Thermocouple defrost thermostat and plugging refrigerator into wattmeter.
2. Force into defrost mode (see section on electronic testing). Wattmeter
should read specified watts (according to tech sheet).
3. When defrost thermostat reaches specified temperature (see tech sheet)
±5°F; thermostat should interrupt power to heater.
Ice Maker See “Ice Maker” section for service
information.
Motor, auger Located behind ice bucket. Drives helix
auger and cube crusher.
PSC (Permanent Split Capacitor) motor
requiring a run capacitor.
Controlled by ice actuator switch in
series with freezer door auger interlock
switch and cube/crushed ice switch.
Internal overload trips out after
approximately 90 second of continuous
run and resets in approximately 3
minutes.
Disconnect power and ohm winding and check for earthing.
Crushed/Cube Dispensing Models:
At room ambient temperature check resistance between wire leads (see
tech sheet for colors on unit being serviced).
Cube Dispensing Models:
At room ambient temperature check resistance cross motor windings. For
resistance values see tech sheet for model being serviced.
Motor, condenser Condenser fan moves cooling air across
condenser coil and compressor body.
Condenser fan motor is in parallel circuit
with compressor.
Check resistance across winding (for resistance value see tech sheet for model
being serviced).
Motor,
evaporator fan
Evaporator motor moves air across
evaporator coil and throughout
refrigerator.
Evaporator fan is in a series circuit with
temperature control, defrost terminator,
and defrost heater.
1. Disconnect power to unit.
2. Disconnect fan motor leads.
3. Check resistance from earth connection solder. Trace to motor frame must
not exceed .05 ohms.
4. Check for voltage at connector to motor with terminator and temperature
control closed.
Overload/Relay Overload is a temperature and current
sensing device.
Overload opens when high current or
high compressor temperature is sensed.
After overload opens, reset can require
up to two hours depending on ambient
temperature and residual heat load in
compressor.
Relay (See PTC Relay)
1. Disconnect power to the refrigerator.
2. Remove relay cover and pull relay off compressor. Pull overload protector
off compressor common terminal.
3. With ohmmeter, check the resistance between male terminal and female
pin receptacle terminal which pushes onto compressor common terminal. At
ambient room temperature overload protector should have less than 1 ohm
resistance. An open overload protector will have infinite resistance.
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