Here is a list of causes that can cause noisy heat pumps:
Not working compressor valves or motor
Broken or misaligned fan blades
Low refrigerant level
Faulty reversing valve
Noisy solenoid coil or contractor
Loud compressor or unit
Ice build-up in the outdoor unit
Something coming in the way of spinning fans
Loose parts
Refrigerant pipes secures too tightly to joists
Outdoor unit needs to shut down through the main circuit breaker:
This is genuine problem which can lead to freezing of the indoor unit. The ice will then travel to external unit. There are some common reasons that can cause this. One could be a stuck contractor.It is always wise to replace the contractor in such situation. Another cause would be a shorted thermostat cable. The short can be caused by a string trimmer hitting against the wire outside. It could also be due to a wire staple piercing on a wire. Rodent-chewed wire or a bad wire could also cause this. Lastly, the thermostat itself could be bad. It could be sending signals to the outdoor, when it does not need to.
Therefore this problem can be caused mainly due to:
Stuck contractor
Thermostat cable shorted
Bad thermostat
Thermostat light stays lit:
The usual cause of this is that the outdoor unit is locked out. The indoor unit will keep running. But as it cannot meet the cooling demand, the thermostat will remain lit.
The best way to deal with such a situation is to reset the unit. Put it off and wait for 30 seconds before turning it on. If both units start working and thermostat light goes out then the machine is back to normal. Remember it can take 10 minutes for the outdoor unit to start after resetting.
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