Component Testing; Indoor Thermostat - Whirlpool ATE0743SPP Technical Manual

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 through-
out test procedures.
• All tests/checks should be made with a VOM
or DVM having a sensitivity of 20,000 ohms-
per-volt DC, or greater.
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.

INDOOR THERMOSTAT

COMPONENT TESTING

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3
• Check all connections before replacing com-
ponents, looking 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.
Refer to page 4-2 for the procedure for servic-
ing the indoor thermostat.
NOTE: The temperature should be above 60°F
(15.5°C) to determine the following readings.
1. Unplug air conditioner or disconnect power.
2. Disconnect the wires from the thermostat
terminals.
3. Set the ohmmeter to the R x 1 scale.
4. Clip the black (–) ohmmeter test lead to
terminal 2 (common) and leave it there.
5. Rotate the temperature control fully coun-
terclockwise (Warmer).
6. Touch the positive (+) ohmmeter test lead
to terminal 1. The meter should indicate a
closed (0 Ω) circuit.
7. Touch the positive (+) ohmmeter test lead
to terminal 3 (L3). The meter should indi-
cate an open (infinite) circuit.
8. Rotate the temperature control fully clock-
wise (Cooler).
9. Touch the positive (+) ohmmeter test lead
to terminal 1. The meter should indicate an
open (infinite) circuit.
10. Touch the positive (+) ohmmeter test lead
to terminal 3 (L3). The meter should indi-
cate a closed (0 Ω) circuit.
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