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TM 5-4120-374-13
Section II. DIRECT SUPPORT TROUBLESHOOTING
a. 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.
b. 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.
5-6. DIRECT SUPPORT TROUBLESHOOTING TABLE
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
COMPRESSOR
1. COMPRESSOR WILL NOT START
Step 1. Check compressor for proper operation and damage.
Replace defective compressor (para. 5-8).
2. COMPRESSOR CYCLES INTERMITTENTLY
Step 1. Inspect sight glass for proper amount of refrigerant.
Add refrigerant as required (para. 5-7).
Step 2. Check for high discharge pressure.
Discharge refrigerant from system (para. 5-7).
Step 3. Check for air in refrigerant system.
Purge refrigerant system (para. 5-7).
AIR CONDITIONER
1. HIGH DISCHARGE PRESSURE
Step 1. Check for excessive refrigerant in system.
Discharge refrigerant from system (para. 5-7).
Step 2. Check for air in refrigerant system.
Purge refrigerant system (para. 5-7).
2. LOW DISCHARGE PRESSURE
Step 1. Check to see if compressor is pumping.
Replace defective compressor (para. 5-8).
Step 2. Inspect sight glass for proper amount of refrigerant.
Add refrigerant as required (para. 5-7).

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