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No heat and I'm cold.

I have a Rheem MD: RGDG-10EAMER, S/N DF50302 F4894 9075.

When I move the thermostat for heat the induction blower operates. The igniter false to glow in 25-30 secods, but the circulation fan operates too.

This problem appears intermittent over the last week. I've noticed the two (2) green lights without an amber when all works according to plan. When the aforementioned problem appears the two green light glow and so does the amber light. The amber lights illuminates after the greens do (2-3 sec). The amber light blinks four times, then on the fifth time the blinking become more rapid.

Cold in Georgia!

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  • sbo38 Dec 05, 2008

    I see no code reference....only schematic and diagram.

  • sbo38 Dec 06, 2008

    I have replaced the ignitor. The problem induction fan works, the igniter works, and then the gas. Now the problem is the circulation fan will not shut off after reaching desired temp. Also, twice the gas shut off 7 degrees before reaching desired setting on thermostat.

    I shut off power and turned it back on. The circulation fan comes back on. This was after I let the circulation fan run for 10 min before I shut it off as mentioned.

    I can shut off the power for 10-15 min and the circulation fan will not operate again until I set the thermostat.

    I have tried the paperclip. I've used a meter on both thermo-switches. Both have continuity until I open their circuit with a flame-torch and open them as designed. Both close when cooled (1 min approx).

    Thanks for the suggestions!


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Check the flame sensor, should be clean, if not steel wool. They snap easy so be easy on it.

Posted on Feb 13, 2016

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Do you have the code reference on your furnace door? If so what does it say? The furnace has locked itself out, and we need to determine what in the world it needs..

Posted on Dec 05, 2008

  • Armando Bernal Dec 05, 2008

    ok, If your getting to no ignitor after inducer fan, and pressure switch (little hose from inducer to little round plastic mounted near inducer) then your ingitor has failed, replace it, a dealer, wholesaler, or contractor will sell you the part, they only need the model number. Expect to pay 15 to 45 dollars depending on their markup. If the fan operates in conjunction with inducer before igniting, the furnace has an open circuit. Look for limit switches near the exchangers (generaly they are manual reset switches), if you have continuity they are ok, same with the auxilary limit (locate switches on schematics), it should have continuity. If you don't want to pull out a meter, then turn off power to unit, pull off two wires from each switch on at a time and put a paperclip or conductor between them. Turn on furnace and if you had a failed switch it will bypass the limit, do not leave this bypassed for long, failure to replace could result in fire danger.

  • Armando Bernal Dec 06, 2008

    If you checked all the mentioned, then only two things could be wrong with the furnace, flame sensor, a short, or bad control board. It is normal for the blower to stay on up to 180 seconds, however it is not normal for it to continue running. Check your fan relay and ensure it is not shorted and causing the blower to work abnormaly. To check therm, pull off therm, disconnect wires, and do the same at the furnace, check for shorts. Then put the red and white together or a temporary therm and watch the cycle, ensure your therm is working properly.


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