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TM 9-4120-430-14
DIRECT SUPPORT MALFUNCTION/SYSTEM INDEX
AIR CONDITIONER, COMPACT, HORIZONTAL
TROUBLESHOOTING
MALFUNCTION/SYMPTOM
PROCEDURE
Compressor Will Not Start
1.
Control circuit may have an open circuit
2.
Faulty circuit breaker
3.
Bad continuity of compressor motor or wiring
4.
Faulty HIGH or LOW pressure switch
5.
Faulty power input plugs (P2 or P1 alternate)
Compressor Starts, But Stops At Once Or After
Short Run Period  Due To Tripped Circuit Breaker
1.
Defective circuit breaker
Compressor Starts, But Stops At Once Or After
Short Run Period  Due To Tripped Low Pressure Switch
1.
Unit activation requires time delay (wait and observe)
2.
Defective low pressure switch
3.
System refrigerant loss
Compressor Starts, But Stops At Once Or After
Short Run Period  Due To Tripped High Pressure Switch
1.
System refrigerant overcharged
2.
Bad condenser fan or motor
3.
Obstruction of air flow through condenser, grill or louvers
4.
Faulty high pressure switch
Compressor Starts, But Stops At Once Or After Short Run
Period  Due To Tripping of Compressor Overload Switch
1.
Faulty compressor
2.
Faulty expansion valve
Insufficient Cooling
1.
Bad filter-drier
2.
Expansion valve obstructed or damaged
0041 00-1

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