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Dometic/Duotherm propane furnace won't fire up

I have a Due Therm Mod 65920-064 and on turn-on, the fan begins to blow but there is no flame. Is there supposed to be something hot to view in the little window? Like an electric hot plug or wire? I don't see anything in there and don't see a reasonably easy way to get into it. Can one get to it without pulling the entire heater out of its cabinet?

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The ignition switsh it wet or spark plug defective u need a replacemet in this case!

Posted on Feb 27, 2009

  • Jalal Sordo
    Jalal Sordo Feb 28, 2009

    just trying to help not inap.

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Fan run compressor run but no cold air


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I have a Dometic DuoTherm ac/furnace unit in an rv. The thermostat got knocked off the wall and now the ac nor the furnace will work. Fan works in manual position only. What could be wrong?


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The furnace will light up and the fan will blow but the flames cut out before my house reaches temp. i have the thermostat set at 70 and the house will not get above 55. i have tried turning the propane...


First, for those of you who might not know, "What is a flame sensor?" A flame sensor is a safety device. When your furnace's main burners ignite (light Up) the flame sensor picks up the heat from the furnace's main burning and says, "YES," and sends a signal back to the main furnace control board saying that it is OK to let the main burner stay on. Or if the main burners do not ignite, the flame sensor does not pick up the heat and says, "NO" to the main control board, Shut That Gas Valve and Main Burners Down! Thank God we have safety controls like the flame sensor. Most of the time, after turning your furnace's power off, you may clean the flame sensors with light sand cloth, emery cloth or steel wool. Reinstall the flame sensor and you are back in business! Over the years flame sensors can build up a light coating of burned-in dust and dirt. This insulates the flame sensor so that it doesn't sense the heat of the flame well enough, so by cleaning it you have almost restored it to its new condition. Seldom, but sometimes they do go out completely.

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The fan on my duotherm a/c doesn't work. I can hear the compressor come on but the a/c doesn't blow any air. There was a fairly loud pop when it quit working. Am I looking at replacing a condenser or relay...


SOUNDS LIKE A OVER HEATED CONTROL SWITCH   THE SWITCH THAT CHANGES HIGH, LOW FAN, HIGH COOL, LOW COOL. REMOVE INSIDE CEILING SHROUD AND LOOK AT SWITH FOR BURNT TERMINALS OR LOOSE WIRES TURN OFF POWER FIRST AT BREAKER.

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2 Answers

Dometic/Duotherm propane furnace won't fire up


If this unit has a spark ignition you may just need to clean the flame sensor. It is a metal rod protruding in the path of the flame.

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Ruud air to air heatpump intertherm propane furnace honeywell th5220d non programable thermostate.fan on furnace will not turn off in aux.mode even though the furnace heat kicks on and off. thank you for...


Make sure fan relay is wired correctly (G) wire. Ensure the fan on therm is not on, it should be on Auto or off.

If your furnace is short cycling because it has to keep heating your home, the delay in the control board may be staying on to compensate for the exchangers getting hot. If it heats normally, then put your attention to your thermostat.

Set the heating system on aux heat only. Fan should not be on, if it does stay on after a heating cycle, see if the furnace is heating normally, and reaching temp as desired before the heat comes off. Then check the therm wiring, pull the face of the therm, disconnect green wire (fan) and try the heating again.

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