What type of system do you have? If you have a heat pump with a reversing valve you will need to set the thermostat settings for a heat pump. Or it can also be the wiring. Check your setting on the thermostat.
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What type of system do you have?
If you have a heat pump with a reversing valve you will need to set the thermostat settings for a heat pump. Or it can also be the wiring. Check your setting on the thermostat.