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Question:

Why won't our new furnace not turn off unless we manually turn the system off?

Why won't our new furnace not turn off unless we manually turn the system off?

Answer:

A furnace uses Gas to heat and the fan doesn't come on (in Auto) until the heat exchanger heats up and will go off after the heat shuts off and the fan runs to cool the heat exchanger. If the fan is running all the time, then your fan may be set to on or has a sticking relay. That doesn't necessarily sound like what you are describing, Sounds like you might have a heat pump. If that is the case then you could have some refrigerant problems. ------------------Since it's a heat pump, it's probably too cold outside for it to work efficiently. It should have electric heat strips to compensate for this. It might still have refrigerant problems. Is the outside part frozen up or look white? maybe the defroster isn't working correctly. Best to call a local tech in this situation
Either your thermostat is defective or is in a part of the house that doesn't get warm. The thermostat must be able to register the temperature before the boiler will shut down. If the area around the thermostat is perpetually cooler than the rest of the house, that's why the boiler won't shut off. If, however, it is in an area sufficiently warm, then there's probably a defective switch somewhere.
If the temperature doesn't go above 69 then it won't shut down turn the thermostat down until you reach a temperature that turns the furnace off if the thermostat is defective this won't happen.If it does then check the shut of point on the thermostat with a separate thermometer
without looking at it sounds like your outside unit is not coming on have you checked its heating up on heatstrips
you may have a defective thermostat

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