Refrigerator Won't Cool Below 40 Degrees
A couple of weeks ago my neighbor purchased an older RV with a Dometic RM1350 refrigerator that holds the refrigerator temperature at 40 degrees as verified by a number of different thermometers. I'm ...
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Instead of replacing the lower control board as I had planned, I decided to gamble $10 by installing a rheostat in parallel with the thermistor. I guessed at an appropriate value for the rheostat's resistance, but it caused the refrigerator to run a little too cold, so my neighbor was able to compensate with the control panel's temp. set button. (I could, of course, have adjusted the rheostat, but this gives him a little more control over the temperature.) The refrigerator's temperature has been holding between 33 and 35 degrees for a couple of weeks now after installing the rheostat.
Reducing the overall resistance of the thermistor's circuit seems to be fooling the control board into thinking the temperature inside the refrigerator is warmer than it is, so it continues to power the heaters until the circuit's output reaches the newly established value.
Of course, I don't know why the control board is looking for a value that is different than the specification---was it shipped this way from the factory and the previous owner lived with the problem, or is something deteriorating in the board itself? Only time will tell.
Reducing the overall resistance of the thermistor's circuit seems to be fooling the control board into thinking the temperature inside the refrigerator is warmer than it is, so it continues to power the heaters until the circuit's output reaches the newly established value.
Of course, I don't know why the control board is looking for a value that is different than the specification---was it shipped this way from the factory and the previous owner lived with the problem, or is something deteriorating in the board itself? Only time will tell.
