Checking Voltage; Checking Thermostat And Wiring - Maytag Amana PMH Series Service And Troubleshooting

SERVICING

Checking Voltage

1. Using a voltmeter, measure the voltage across terminals
L1 and L2 of the outlet.
2. No reading - indicates open wiring, open fuse(s), no
power or etc. from the unit to fused disconnect service.
Repair as needed.
Checking Thermostat, Wiring and Anticipator
1. Visually inspect all the wires.
2. Check wires for loose connections (tighten as needed or
replace Terminal if needed).
3. Check wires for pinched or cut wires.
With power ON and thermostat calling for cooling.
1. Use a voltmeter to check for 24 volts at thermostat wires
C and R on the terminal strip of the control board.
2. No voltage indicates trouble in the thermostat, wiring or
external transformer source.
3. Check the continuity of the thermostat and wiring. Re-
pair or replace as necessary.
Indoor Ambient Themristor
1. Remove the front cover.
2. The thermistor is on the front of the unit and plugs in the
lower right corner of the board. Unplug the thermistor
from the board.
3. Check continuity between the thermistor wires, see
chart for resistance and temperature ranges . If out of
range replace the thermistor.
Indoor Coil Thermistor
See following page for resistance/temperature
1. Remove front cover.
2. Remove the two mounting screws, one on each side
of the control board cover. Tilting the control panel out,
remove the cover.
3. Disconnect the red thermistor from the control board's
ICT Red CONNECTOR.
4. Check continuity between the thermistor wires, see
chart for resistance and temperature ranges. If out of
range replace the thermistor.
5. To replace the indoor coil thermistor remove the ac-
cess plate shown in picture below to gain access to the
thermistor. Thermistor goes through the side panel into
control board compartment.
Outdoor Coil Thermistor
1. Remove chassis from wall sleeve.
2. Remove the two mounting screws, one on each side of
the control board cover. Tilting the control panel out.
3. Unplug the Blue Thermistor from the connector.
4. Unclip thermistor from outdoor coil.
5. Carefully slide thermistor wiring through the center
partition. When replacing, be sure all holes in the center
partition are properly sealed with Permagum.
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