Thor Forums

[javelin]

To me, if the fridge/freezer works fine (maintains a relatively constant appropriately cold temp) on 120VAC then fridge portion is OK......including the thermostat sensor. If it does not work on propane only, even though the flame seems good (all blue), it sounds like not enough heat (BTUs) getting to the correct location on the ammonia tube in the flue/baffle/chimney space above the burner. Possible reasons for inadequate heat from the burner would be lower than normal propane pressure; partial blockage of oriface or burner tube (like soot, rust bits, dirt, bugs); flue/chimney blockage perhaps so inadequate draft. Does your fridge give any alarm codes on the control display when running on propane? Has the chimney ever been worked on or the AC element replaced ? Ever been cleaned out ?

What is the condition of your coach battery charge (12.6vdc wet cell unloaded is approx full charge)......when on shore power the converter is charging the coach batteries so DC voltage at the fridge cct board should be good; when on propane only (shore disconnected), if the coach batteries are discharged perhaps the fridge control board may not operate like it should.......you should get a Lo DC code for that though.

Not sure about the fridge control board being faulty for propane only......clearly it works for 120VAC operation you say......so to me you are changing the heat source, but the control temp sensing system should be basically the same (famous last words) not having a detailed schematic. Of course different switch contacts used etc.