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Day and night model 80u-19a burners on but blowers kick on and off
I have a Day and Night model 80U-19a Furnace. The blower is kicking on and off while the burners are still on every 20-30 seconds. It doesn't run constantly until the thermostat reach the necessary temperature. What do you think is bad? Fan relay switch? I have replaced the thermostat, check the voltage (26V). Please help.
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