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Rheem Furnace sometimes takes a couple of ignition cycles before

Symptoms:
1) Thermostat sends signal to furnace when temp drops.
2) Exhaust fan comes on for a minute or so.
3) Ignitor comes on and glows.
4) Gas turns on and ignites.
5) After about 10 seconds gas turns off.
6) After a few seconds ignitor glows again.
7) Gas turns on and ignites.
8) Sometimes gas will stay on, heats the house and turns off as designed. Sometimes it repeats steps 5,6 & 7. Other times I have to turn power off to reset the logic.
Is this a faulty thermostat in the plenum? Is this common with Rheem Furnaces?

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  • 306 Answers

Try cleaning the flame sensor. It is located right besides the last burner. Looks like a thick piece of wire. Take steel wool and gently remove the carbon that has built up. Should only take 4 or 5 strokes. Let me know how it goes after that. ken

Posted on Dec 23, 2008

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