Ron Nielson wrote:
wnjj wrote:
One potential thing that could answer your question. If you are comparing results with and without AC connected I assume your 12v system is not being charged. Without the converter running the lower 12v system voltage may affect the control circuitry for better or worse, including the thermistor circuit. Pure speculation on my part.
During my testing, 120V was being supplied to the entire trailer, the fridge as well as 12V via the batteries, just as if it were running as it normally does. Only thing different is that the leads for the heater were supplied 120V separately and without being regulated by the control board.
Thanks for the comments.
When it ran OK on propane, was the main 120V still supplied but with the fridge manually switched to propane? My point was that the ~13V charging system could be negatively affecting the thermistor detection circuit.
Ironically, I just bought a thermistor for my Norcold 621L because it was melting when running on propane but working great on AC. I'm just getting started and I may have a propane issue. I also haven't retested since I removed and cleaned the burner/orifice. I figured it's inexpensive enough and nice to have on hand. I haven't replaced it just yet.
