We have a heat pump, and it is relatively cold right now (28F). The
heat pump has been running continuously for several hours. (Sometimes
the emergency heat came on.) Then a few minutes ago the machine
started making a different sound. I went out to check it, and a
mechanical sound is coming from the compressor, but the compressor fan
had stopped running. I turned off the unit at the thermostat, but the
sound is still coming from the compressor.

Is this normal? Is it the defrost cycle?
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