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Before testing any of the components, perform the
following checks:
•
Control failure can be the result of corrosion
on connectors. Therefore, disconnecting and
reconnecting wires will be necessary throughout
test procedures.
•
All tests/checks should be made with a VOM or
DVM having a sensitivity of 20,000 Ω per volt DC,
or greater.
•
Check all connections before replacing
components. Look for broken or loose wires,
failed terminals, or wires not pressed into
connectors far enough.
•
Resistance checks must be made with power
cord unplugged from outlet, and with wiring
harness or connectors disconnected.
Bin and Evaporator Thermistors
Note: For the most accurate measurement,
immerse the thermistor in ice water for 5 minutes
and then use the 32°F/0°C reading in the chart
below.
°F
°C
0
-18
10
-12
32
0
50
10
70
21
90
32
Cutter Grid
Leads are 4 Ω to 5 Ω at 8.4 VAC
Dual Transformer
•
Primary black and white leads are 3.5
at 120 VAC.
•
Secondary yellow and yellow leads are 0.11
to 0.14 Ω at 8.4 VAC.
•
Secondary red and red leads are 0.14
Ω at 12 VAC.
Component Testing
Thermistor Resistance
81,715 - 99,874 Ω
59,422 - 72,627 Ω
30,266 - 36,992 Ω
18,219 - 22,267 Ω
10,280 - 12,564 Ω
6,387 - 7,807 Ω
Ω to 4.5 Ω
Ω
Ω to 0.18
Water Recirculation Pump and
Reservoir Drain Pump
Leads are 3.6 Ω at 12 VAC.
Condenser Fan Motor
Run the service mode. Check for the proper operation
of the condenser fan motor, 185 Ω at 120 VAC.
Water Level Sensor
Run the service mode. Check for the proper
operation of the water level sensor. The Service LED
should stay on solid when the water level sensor is
immersed in water. When the water level sensor is
out of the water, the Service LED should blink.
Hot Gas Valve Solenoid
Leads are 365 Ω to 390 Ω at 120 VAC.
Measured Fill Water Valve
Run the service mode. The connector with black and
white wires should read 120 VAC. The orange/white
wire to the black/red wire should read 14 VDC.
Compressor, Overload Protector, and Relay
To test the compressor windings:
•
Common (C) pin to the Start (S) pin should read
8 to 11 Ω.
•
Common (C) pin to the Run (M) pin should read 2
to 3 Ω.
To test the relay:
1.
Position the relay with the coil facing down.
2.
Insert the tip on one of the ohmmeter test leads
into the Run (M) pin socket, and touch the other
ohmmeter lead to the spade terminal. The meter
should indicate a closed circuit (0 Ω).
3.
Move the tip of the ohmmeter test lead from
the spade terminal into the Start (S) pin socket.
Leave the other ohmmeter lead at the Run (M)
location. The meter should indicate an open
circuit (infi nite).
4.
Turn the relay over so that the coil faces up.
5.
With the tip of the ohmmeter test leads at the
Start (S) and Run (M) pin sockets, the meter
should indicate a closed circuit (0 Ω).
– 32 –
(Continued next page)
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