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I'm not entirely sure how old the system is. I bought this house a few years ago but the house is 23 years old.

I think you're right about the relay. After reseting the system using the circuit...

I'm no expert on heat pumps but as I understand it... once it gets too cold the heat pump cannot generate enough heat to heat the house. The EMERGENCY HEAT, I believe, is simply an electrical heating...

Hello,

My heat pump won't stop heating my house when the temperature gets above the setting.

Example:
Outside temperature: 14 degrees F
Inside temperature setting: 68 degrees F
Actual...