Dometic Americana Temperature Control Failure
While I was doing a system check on my trailer (and getting schooled in how my AC/DC systems works together) I remembered that my refrigerator is problematic. I have to play games with it such as kee...
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The connector may be latched in place but there could be a little corrosion in the two-wire connections themselves. I helped with a Dometic that was freezing everything. Tested Thermistor and it read out OK. Plugged it back in and left, thinking I had NOT found the bad Thermistor problem I'd suspected. Next day she's thanking me for fixing it. I think I reduced resistance into the range where the thermistor could tell the cooling unit to stop.
EDIT to complete this reply...
In a Dometic manual, I found the resistance of a thermistor should be 8,000 to 10,000 Ohms at 32 to 36 Degrees F. Proceed as follows:
1. Prepare an Ice Water Bath. Cup of mostly Crushed Ice, partly Water and Stir. This gives you the 32-36*F.
2. Unclip Thermistor from Fin and Submerge in the Ice Water Bath. Swizzle for a few seconds and let stand a couple minutes.
3. Disconnect Thermistor Plug from Control Board.
4. Measure Resistance across the two pins of the Thermistor Plug. DO NOT probe up into the cavities that slip over the Pins on the Board. Rather, touch the probes to the exposed contacts at the opposite end, the ones you can see before unplugging the Plug.
5. Meter should read 8-10,000 Ohms.
Nothing wrong with Snip-the-Tip as a replacement part BUT do this test as well. If you just assume it's Thermistor and change it without working the contacts at the board, you could still have excess resistance in the circuit. Even if the Thermistor was actually Bad.
EDIT to complete this reply...
In a Dometic manual, I found the resistance of a thermistor should be 8,000 to 10,000 Ohms at 32 to 36 Degrees F. Proceed as follows:
1. Prepare an Ice Water Bath. Cup of mostly Crushed Ice, partly Water and Stir. This gives you the 32-36*F.
2. Unclip Thermistor from Fin and Submerge in the Ice Water Bath. Swizzle for a few seconds and let stand a couple minutes.
3. Disconnect Thermistor Plug from Control Board.
4. Measure Resistance across the two pins of the Thermistor Plug. DO NOT probe up into the cavities that slip over the Pins on the Board. Rather, touch the probes to the exposed contacts at the opposite end, the ones you can see before unplugging the Plug.
5. Meter should read 8-10,000 Ohms.
Nothing wrong with Snip-the-Tip as a replacement part BUT do this test as well. If you just assume it's Thermistor and change it without working the contacts at the board, you could still have excess resistance in the circuit. Even if the Thermistor was actually Bad.
