Carrier 42QHP09E8S Service Manual page 58

1.Remote Maintenance
Possible causes of trouble
Unit will not start
The power switch is on but fans will not start
The temperature on the display board cannot be set
Unit is on but the wind is not cold(hot)
Unit runs, but shortly stops
The unit starts up and stops frequently
Unit runs continuously but insufficient cooling(heating)
Cool can not change to heat
Unit is noisy
Test method / remedy
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Electrical Circuit
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Refrigerant Circuit
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