Question about Honeywell Programmable Thermostat Heater

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My furnace works intermittently.

I have a honeywell thermostat and a rheem 90+ forced air furnace that is 6 yrs old. Occasionally the furnace does not turn on when the thermostat tells it to. If you manually lower the temp and then press "run program" it works fine for a few more days. Please HELP!!!

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  • 61 Answers

You may have a dirty flame sensor. There are a number of other possible causes as well. Rheem/Ruud/Weatherking furnaces also have problems with the connection on the blower deck.
The flame sensor sometimes must be bypassed around the MOLEX CONNECTOR in the deck due to humidity.
Hope this helps.
Matt
maxhtcl1@verizon.net

Posted on Jan 15, 2009

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