Dometic DM2652RBX - Won't run on electric or gas

Check Light means NOTHING to the 120 side and is NOT a diag for anything else other than LP lighting. ALL it means is, the refer tried to ignite on LP and did NOT. FIND the cause of not lighting on LP----No LP to the refer/Ignitor not operating/the burner is dirty, preventing lighting. If on AUTO, and you have 120 to the 120 receptacle at the back of the refer, it should run on 120 and if NOT, the odds are the 120 fuse on the rear control board is blown, which usually means the 120 element may be bad, but not always. IF that fuse is blown and unit on AUTO, it will go direct to LP. Take the unit out of Auto(Auto light OFF) and restart. TRY at least 10 times to help purge any air in the system. Doug

Your refer is 4/5 years old and if the burner has never been cleaned it is probably dirty causing the LP problem.