Carrier 42QFD048D8S Service Manual page 83

2.Field Maintenance
Possible causes of trouble
Unit will not start
Compressor will not start but fans run
Compressor and condenser (outdoor) fan will not
start
Evaporator (indoor) fan will not start
Condenser (Outdoor) fan will not start
Unit runs, but shortly stops
Compressor short-cycles due to overload
High discharge pressure
Low discharge pressure
High suction pressure
Low suction pressure
Unit runs continuously but insufficient cooling
Too cool
Compressor is noisy
Horizontal louver can not revolve
Test method / remedy
Refrigerant Circuit
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 Troubleshooting 15
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Others
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