Installation, Operation, and Maintenance Manual
CA Series Heat Pumps -8733851021 (2025/04) US
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Unit Troubleshooting
Problem
Mode
Check Possible Cause Action
Cooling Heating
No compressor or fan opera-
tion
X X
Power LED ON
Bad thermostat
connection /
faulty thermostat
Check thermostat and wiring. Check unit terminal
block for 24 VAC between “Y” and “C” and “G” and “C.”
Power LED OFF
Low or no supply
power
Ensure that the supply voltage to the unit is with in the
range shown on the unit data plate.
Faulty control
transformer
Check for 24 VAC between “R” and “C” on the unit ter-
minal block. For 75 and 100 VA transformers, check
that the transformer circuit breaker has not tripped.
Check low voltage circuit for overload conditions or
short circuits before replacing the transformer.
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