Question about Honeywell Programmable Thermostat Heater

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Turns on and then off and back on by itself

First the furnace turns on and about 10 seconds later turns off and then about 10 seconds later it turns on again. Why is it doing this?

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Posted on Jan 13, 2009

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Posted on Jan 02, 2017

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SOURCE: Turns on and Turns off

Does the furnace burners light? You could have a bad thermostat or a flame sensor. To check if it is thermostat turn power off to furnace take thermostat off wall take wires marked r & w and connect them together then turn power back on. If furnace comes on and stays on then you need a new themostat if not it is the flame sensor inside furnace. Also check furnace filter

Posted on Jan 16, 2009

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