Points to check before you call
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Did you replace your furnace filter recently ? A dirty filter limits the air flow and overheats motors.
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Did you replace the batteries in your thermostat? Corroded batteries will either shut your equipment off or can make it overshoot the temperature.
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Are your outside vent ports free of debris or blockages? Snow, ice, leaves and bees are common possibilities.
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Propane and oil customers: check your tank level.