Question about Honeywell Programmable Thermostat Heater

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Turns on and Turns off

The furnace turns on but about 10 seconds later it turns off and then waits another 10 seconds and turns on again. Is something hooked up wrong? Why is it doing this?

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  • Annie924 Mar 10, 2009

    I have the same problem- seems to be always in the early morning- it turns on and off repeatedly and won't stop unless i turn the unit off or it goes to a time where it is time to blow hot air again. I had a furnace company come look, they did a complete inspection and found nothing. Should we put in a manual thermostat or just a new digital on?

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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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Posted on Jan 02, 2017

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