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First Stage will not heat to shut off temp
My heater will not heat up to the shut off temp. No matter what the setting on the thermostat, the temp will get up to 1° below the temp and just blow cold air. If the temp goes down in the room, the second stage will come on and bring the temp up to where the second stage cuts off and the cycle continues.
I am really not sure what else information to provide. Can anyone help?