Whirlpool ATE0743RPP, Technical Manual

Page: 51 / 92

5-1
COMPONENT TESTING
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.
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.
INDOOR THERMOSTAT
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.
• 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.
2
3
1