Originally Posted by KnTShow
The main breaker trips occasionally, but the breaker that runs the AC and the lights overhead trip all the time. As far as the fridge, the items on the lower shelf are now freezing and the thermostat is on the fins. I may need a new thermostat, but I want to make sure it's not something else given all of the things happening.
I'm not clear on the symptoms, so narrowing down to a fix is just a WAG (wild a$$ guess)...
You say, "the breaker that runs the AC and the lights overhead". The AC does operate on a circuit breaker (120VAC) but the overhead lights operate on the battery voltage (12VDC) and that is not affected by any of the circuit breakers. Granted, the converter/charger does provide 12VDC to operate the 12 volt systems when on shore power, but if the "REC/CON" circuit breaker opens, the battery will still provide DC power to keep the overhead lights operational. If they are going off when the Air Conditioner breaker opens, then you've got some kind of "weirdly strange" issue.....
The Dometic refrigerator cabinet temperature is controlled by an adjustable thermistor that is housed in a plastic sheath and attached to the far right cooling fin in the refrigerator (not freezer) section. Sliding it up will make the temperature cooler and sliding it down will make the temperature warmer. The thermistor wire plugs into the refrigerator control board (in the back, under the black plastic cover). If it is not plugged in, the refrigerator goes into "limp mode" and will run constantly. This is a feature to provide cooling in the event of control board failure, but does result in frozen food, which most people find better than hot, spoiled food. Check the thermistor plug to make sure it's securely plugged into the control board and experiment with the thermistor location. You may find that sliding it up or down the fin will adjust your refrigerator compartment temperature enough to stop freezing your food. Remember though, some parts of your refrigerator are in direct contact with those cooling fins and those areas will always be colder than the more distant areas, so pack your food according to how likey it is to be damaged by freezing temps.
As for the water heater, there is a 120VAC thermostat that controls the electric element and a 12VDC thermostat that control the propane function. Depending on which "heating system" you were using, if there's a problem, it would be "one or the other" of those two thermostats.
Looking at your overall issues, I'd wonder if you might have a battery issue that is causing most of (or maybe all of) your problems. The refrigerator, the water heater and the thermostat for the air conditioner all operate on battery power, so a fully charged battery is vital to proper operation of all the control electronics for all three of the complaints. I'd first do some critical checks on the battery and the converter/charger system to make sure it's operational and the battery is fully charged.