Joe, (McKeesport, PA)
Joe, though you didn’t specify the brand of refrigerator in your motorhome, I believe you have a Norcold. Excessive AC ripple can indeed cause the problem. In order to verify that this is the case, make sure the house batteries are fully charged and in good condition and then disconnect the AC shore power to the coach. This will remove the AC source and therefore the ripple. The refrigerator should function normally on the propane mode and powered by the batteries. If you continue to have this problem with the camper running strictly on 12-volts only, the problem lies elsewhere. In this case you should suspect faulty or loose connections, faulty or intermittent gas valve, flame sensor, low propane gas pressure or a faulty control board.