The RV Doctor: No Auto-Mode on RV Refrigerator

No Auto-Mode on RV Refrigerator

I recently purchased a 2006 Coachman Class A motorhome with a Dometic refrigerator that has an “Auto Mode” switch to start up electrically using 120-volts. It also has a “Gas Mode” switch to start up using propane. After several successful trips using both options, a problem has developed where I can only use the “Gas Mode” switch to start the fridge. It will not start using the “Auto Mode.” The light inside will come on so it is getting power but it will not get cold even after 24 hours. Can you advise what is causing this problem? Patrick H., (Hockessin, DE)

Patrick, you say you can run the refrigerator on “Gas Mode,” but when you switch it to “Auto Mode” does the indicator lamp illuminate? You may have a blown fuse on the lower circuit board. It’s relatively easy to check if you have a volt, ohm multimeter. It’s possible you may have a problem with any number of the components or wiring within the AC circuitry, but the most common cause is a blown AC fuse on the lower circuit board. But when it’s running on “Auto Mode,” that indicator lamp should also be lit.  

Here’s what you can do; Unplug the refrigerator from its receptacle at the rear of the refrigerator, through the lower exterior vent. Gain access to the lower circuit board and carefully remove the cover. Once removed, plug the refrigerator back in, turn it on “Auto Mode” and measure for AC voltage at terminals J5 and J6 on the board itself. If the unit is already cold, you may have to turn the thermostat to a lower temperature setting or wait until it warms a bit. You should also read voltage on terminals J7 and J8 as they lead directly to the AC heating element. If you don’t have voltage at these terminals, check for continuity of the 5-amp AC fuse and the 3-amp DC fuse on the board. Chances are the 3-amp DC fuse is good since the DC lamp works inside the refrigerator, but I’m guessing the 5-amp AC fuse is blown. Worst case scenario is the board itself is faulty.

If indeed you have voltage at terminals J7 and J8, then it’s possible you have a burned out heating element. If that is the case, I’d recommend a pro service tech perform the replacement.

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About smokeycamping

Well let's see have lived in NY for my whole life, have always loved the outdoors (as long as it is warm out) have always hated the cold, and like a dummy have stayed in NY. But now with my second try my wife, we have been camping now for well over 25 yrs. We currently own a 2010 Cedar creek silverback 35TS and can not wait to get out on the highways and see this great country we all call home. Hope to see every National park before my medical issue becomes too bad to travel. I love my African gray parrot (she is my baby) and have two dogs at the time brother and sister mutts, but love them all the same. Have always been a big Nascar fan, love computers (have a number of certificates to build and work on them) am trying to learn photography, enjoy light hiking, being with good friends and folks. country music, pop music and just being outdoors. So I hope someday to meet some of the great people who like what I like and post out there in some great campground somewhere in the country, till then I will keep posting and I hope you keep liking.

Posted on October 15, 2014, in The world as i see it as a camper and who loves his country and tagged , , , , , , , , , , , , , , , , . Bookmark the permalink. Leave a comment.

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