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GlennLever's avatar
GlennLever
Explorer
Aug 22, 2014

Problems Dometic Elite dual fuel refrigerator RM7732

We have a Dometic Elite dual fuel (electric / LP) side by side refrigerator Freezer in our 1997 American Dream, Model RM7732.

It works great on electric but has been reluctant to start on LP. Once started it runs fine. (LP detector is on in the coach)

It usually takes several attempts to start it on LP. By this I mean you turn it on and after a short period of time the check light comes on.

When you start it you can hear a solenoid click, but never hear the LP fire up. When you check out side you can smell LP.

Once it does fire it runs fine for the whole weekend.

I have given up on RV service centers as they do not seem to repair things correctly.

The chimney is clean, I believe it is a problem with the igniter.

Is there someone that can walk me through a check out procedure to identify the failed component?

I am handy, have tools and multimeter.

Just found this, Service manual for RM7030 and RM7732
Class A

26 Replies

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  • dougrainer's avatar
    dougrainer
    Nomad
    Aug 22, 2014
    Take the black control module cover OFF. Look at the epoxy that the resistor and such are mounted in. IF the Epoxy is Yellow/Beige, REPLACE the control module. Dometic had bad modules 20 years ago and the symptom was intermittent check light and no fire on LP. If the epoxy is greenish, then your module is current, look for a dirty burner, bad spark electrode or bad re-ignitor. Doug (one of those Service Center Techs).
  • enblethen's avatar
    enblethen
    Nomad
    Aug 22, 2014
    Start by cleaning the burner area and orifice. Soak the orifice in alcohol(rubbing not drinking). Make sure that the ignitor/flame sensor is positioned correctly.
  • GlennLever's avatar
    GlennLever
    Explorer
    Aug 22, 2014
    Old-Biscuit wrote:
    Could be as simple as needing to purge propane line (placing a demand on LP regulator to establish flow).
    Turn on stove top burners on high......let burn for 30 seconds then see if fridge will lite off on propane first try.


    Could be dirty burner slot..disrupts propane flow out of burner

    Could be spark electrode not properly positioned and gaped. Should be directly over main flame and have a gap of 3/16" (tip of electrode to burner)

    Could be dirty spark electrode.......electrode is used to send a milivolt signal back to circuit board to prove flame. If dirty could have good spark but no return signal.

    HERE is a service manual


    The water heater (LP) is working fine (line purged)
  • GlennLever's avatar
    GlennLever
    Explorer
    Aug 22, 2014
    Ok, I will start on this project Monday as I have three upcoming trips and would like it working. I will keep you posted.
  • wa8yxm's avatar
    wa8yxm
    Explorer III
    Aug 22, 2014
    Suspects:
    Maintenance, routine maintenance includes cleaning of the burner and the gas jet, There is a spider that likes to nest in the jet

    Theromcouple: In this case it does light, but it does not know it has lit also burner adjustments may be off a bit so the flame is not hot enough.

    Control board.. This can prevent it from lighting.. had that go bad on both furnace (Failed to detect flame) and water heater (Refused to ignite)

    IF the control board is the culprit, consider Dinosaur Boards as a replacement.
  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    Aug 22, 2014
    Could be as simple as needing to purge propane line (placing a demand on LP regulator to establish flow).
    Turn on stove top burners on high......let burn for 30 seconds then see if fridge will lite off on propane first try.


    Could be dirty burner slot..disrupts propane flow out of burner

    Could be spark electrode not properly positioned and gaped. Should be directly over main flame and have a gap of 3/16" (tip of electrode to burner)

    Could be dirty spark electrode.......electrode is used to send a milivolt signal back to circuit board to prove flame. If dirty could have good spark but no return signal.

    HERE is a service manual

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