December 1997 41 RS1300003 Rev. 0
Component Testing
Component Description Test Procedures
Heater, cavity Applied to back of ice and water cavity to
help prevent condensation from forming
on face of cavity. Wired in series with hot
side of line through auger interlock
switch.
Heater is not replaceable. Some models have spare heater foamed in place at
factory. See technical data sheet for model being serviced.
Check resistance across heater.
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 17 mfd run capacitor.
Controlled by ice actuator switch in
series with freezer door icemaker
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 grounding.
Crushed/Cube Dispensing Models:
At room ambient temperature check resistance between white to blue wire
leads; white to orange wire leads; and blue to orange wire leads (see tech
sheet).
Cube Dispensing Models:
At room ambient temperature check resistance cross motor windings.
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 coil.
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 ground 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.
Relay, PTC When voltage is connected and relay is
cool, current passes through relay to
start winding. After a short time, current
heats the resistor in relay and resistance
will rise blocking current flow through
relay. Start winding remains in the circuit
through run capacitor.
Solid state relay plugs directly on
compressor start and run terminals.
Relay terminals 2 and 3 are connected
within relay. Run capacitor is connected
to relay terminal 3. L2 side of 120 VAC
power is connected to relay terminal 2.
With power off check resistance across terminals 2 and 3:
Normal = 3 to 12 ohms
Shorted = 0 ohms
Open = infinite ohms
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