Refrigerator gas operation help please

Our 179 has a Dometic RM8501 refrigerator with a new problem while operating on gas mode.

It works fine on electric and battery power.  It has worked fine on gas until now.

It will ignite and continue burning.

However, it "pops" and "burps", the flame turns off and immediately comes back on.  This happens several times per minute and each stoppage lasts for a second or two.  The flame always comes back on-sometimes with the igniter and sometimes it doesn't stay off long enough for the igniter to work, but still the flame comes back(I guess that the burner is hot enough to re-ignite the gas)

It seemed to be bad propane, so  I changed tanks. Same issue. I turned the tank off, purged the propane lines ans still have the same issue.

I broke it down and cleaned the burner, the igniter, the flame sensor and the orifice as well as blowing out the line from the gas valve to the burner. We still have the same issues. I redid all of the cleaning process, including soaking the orifice in alcohol for 45 minutes-same issue.

I have pulled/pushed/twisted all wiring coming into or out of the electrical boxes on the rear of the refrigerator and no change.

It doesn't seem to be a physical/mechanical problem.

Now, I'm thinking it must be either (1) the gas valve is stopping the gas flow for an instant and then returning to normal OR (2) there is an electronic issue in one of the circuit boards that is causing the issue.

I have called Dometic technical services and they are NO help. They say take it to a qualified service tech(which I may ultimately have to do)

I would appreciate any thoughts or suggestions.

thanks

Travel often and safe

Vann

That doesn't sound like normal operation even for a dometic.  The pops and burps happens several times a minute right?  The pops and burps are a few seconds long right? And these continue for the entire time the fridge is on the gas mode right?  How long have you run the fridge playing that tune?  Have you run the fridge lone enough to tell if it does an adequate job at cooling the fridge while harmonizing?  Does the flame seem to be bright blue and is it of a good size?  The only thing that comes to my mind is that there is a bimetal sensor that should be in the flame that has to check the presents of a flame or it will shut down the gas flow.  There maybe an intermittent problem with that sensor.  Hope this helps you.

Reading your fridge's symptoms and your remedies the only thing that came to mind could be a faulty flame sensor.  I don't know how to verify its workability or where you can find a replacement. I found this link on youtube which seems to be relevant to your fridge's symptoms https://www.youtube.com/watch?v=biybQ7qI4Fo6/2-6/9  Hope this helps.

thanks everyone for your ideas and suggestions.

We are leaving Monday for a short 4 day  trip, so I have put off any further work on the fridge for now.  We will be staying in a US Park Service campground with power, so I will use 120v  for the fridge.

a potentially new development has come up.

We talked to a mobile repair service and a dealer who we have used before.  It sounds like it could be a control board issue.  If so, we will spend several hundred diagnosing and repairing plus the parts cost. could be $5-600 or more-and it's still a 2015 model approaching 9 years old.Plus, we have had a lot of trouble with this unit over the full time that we have owned it(2017)

So we started thinking about removing the microwave and putting in a new , larger(6 cu ft) refrigerator.  Both Dometic and Norcold make a unit that we can make fit into the combined fridge/microwave cabinet. We never use the m/w as we normally boondock anyway. We can pull out the old fridge and adapt the cabinet and let a dealer purchase and install a new model.

So.........

anybody got experience doing this? or with Norcold?

Again, thanks

Vann