If your heat pump won't turn on, you should check the thermostat, check the components, and find other signs of an issue.
Common Heat Pump Problems
Should Heat Pump Defrost Cycle Worry You? - Cielo Breez
Why Is My Heat Pump Not Keeping Up In Winter? - Townsend Energy
What to Do If Your Heat Pump Won't Turn On
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Why My Furnace Won't Turn On? How to Fix? [With Pictures]
Heat Pump Compressor Not Turning On: What To Do - Point Bay Fuel
Goodman Thermostat Not Working, Turn off the furnace power and
Heat Pump Compressor Not Turning On: What To Do - Point Bay Fuel
Why Won't My Heat Pump Switch Modes?
Heat Pump Not Turning On? Here's What To Check.
Why won't your HVAC fan turn off?