TechPlus ComfortAire, Service Supplement Manual

Page: 58 / 86

Compressor Trouble Shooting
1. Excessive Heat Load such as running the compressor with the doors and
windows open will increase incidence of compressor failure. Poor door
and window seals or loose parts, can also contribute to premature failure.
2. Dirt on the condenser and evaporator coils will restrict air flow causing
capacity loss.
3. Incorrect belt tension will not turn the compressor at proper speed and too
tight a belt will cause premature failure on clutch and bearings.
4. Shortage of refrigerant, check and repair leaks.
5. Faulty expansion valve – high super heat will cause low suction pressure,
and low super heat will cause high suction pressure.
6. Excessive oil in the system will result in a lower than normal suction
pressure reducing capacity.
7. Moisture in the system.
8. Expansion valve looses its charge the system runs in a vacuum.
9. Air in the system will cause high head pressure.
10. Dirt in the expansion valve screen will cause low suction pressure.
11. Ice on the evaporator coil will restrict air flow.
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APPENDIX
c O m F O r t A i r e A / c s Y s t e m s
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