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 TM 9-4120-430-14
UNIT TROUBLESHOOTING
AIR CONDITIONER, COMPACT, HORIZONTAL
THIS WORK PACKAGE COVERS:
Air Conditioner Fails to Operate, Insufficient Cooling, Fan Motor Fails to Operate, Compressor Will Not Start,
Insufficient Heating
INITIAL SETUP:
Personnel Required
One
Reference
General
This section provides information useful in diagnosing and correcting unsatisfactory operation or failure of the air
conditioner. Each malfunction is followed by a list of probable causes and actions to take to remedy the malfunction.
You should perform the tests/inspections and corrective actions in the order listed. Refer to the malfunction/symptom
index (WP 0008 00) as a quick reference index for troubleshooting procedures.
This manual cannot list all malfunctions that may occur nor all tests or inspections and corrective actions. If a
malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
Control Circuit
The cause of a systems failure to operate can be greatly narrowed if the control that caused the failure can be isolated. It
is the function of safety devices to open the circuit under certain conditions; therefore, additional checking may be
required to determine whether the safety device is open because it is bad or because it is doing what it is supposed to do.
The following steps contain instructions for checking the control circuit.
1. Disconnect power from the air conditioner and position Mode Selector rotary switch to OFF.
2. Test continuity across each control in the affected circuit, using an ohmmeter. Refer to the appropriate schematic
diagram (WP 0038 00) as a guide to the connections in the circuit.
3. Replace defective parts.
Safety Devices
When testing the control circuit and other equipment, you must take into consideration the fact that open safety devices
may not be bad. It may be normal for the device to be open under the existing conditions, or it may indicate trouble
elsewhere in the air conditioner.
WARNING
R-22 REFRIGERANT
Refrigerant under pressure is used in the operation of this equipment.
0013 00-1
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