Amana Heat Pumps PMH123

Remove the thermistor leads from the circuit board

Check the thermistor for continuity

Does the thermistor test correctly according to the chart?

Replace thermistor if it does not test as above

Disconnect all power sources before servicing or installing the unit

Verify that multiple power sources are not present

Remove screws securing the chassis to the wall sleeve

Carefully slide chassis out of wall sleeve

Record dry bulb temperature of return air at conditioner (Step A)

Record dry bulb temperature of air leaving conditioner (Step B)

Ensure dry bulb thermometer temperature on sling psychrometer is within ±1°F of return air thermometer reading (Step C)

Record wet bulb temperature on sling psychrometer

Temperature Difference Calculation

Calculate temperature difference by subtracting Step B temperature from Step A temperature

Use Cooling Range Chart to determine cooling range based on calculated temperature difference

Front Panel and Control Knobs Removal

Remove the unit front by tilting the bottom of the front outward and then lift the front straight up

Remove the control knobs on the control panel cover by pulling upward on the knobs

Remove the control panel cover by removing the two screws holding the control panel cover

Tilt the control panel forward to gain access to the wires

Remove the power cord clamp located near the bottom right of the chassis

Disconnect all power sources before servicing or installing the unit

Measure the voltage across terminals L1 and L2 of the outlet using a voltmeter

Is there a voltage reading across terminals L1 and L2?

Identify possible issues if no voltage reading is present

Describe the repair actions taken if issues were identified