Scott for Model Number Maytag Model Number:MRT311FFFZ00 I have a Maytag refrigerator that is not defrosting. I have checked the defrost heater at 36 Ohms and the defrost heater inline fuse checks ok. I have replaced the control board and it still is not defrosting. I need to run the diagnostics mode but the directions on the Service and Wiring Sheet do not seem to match my refrigerator. I don't know is what the resistance of the two thermistors should be - below is what I have measured. (there is no info on the service and wiring sheet): freezer thermistor T-O-D 1733 J (18 kOhm cold) (2.7 kOhm warm) refrigerator thermistor T-O-D 1725 J (8 kOhm cold) (3.2 kOhm warm) #W10384183 The T-O-D 1725 J is printed on the thermistor and I saw a reference as part W10384183. I have not seen a part number for the T-O-D 1733 J thermistor. My local parts store says they think I should replace the bimetal but my refrigerator does not have a bimetal. I suspect maybe it's the thermistor in the fridge section that only has a variance of 4.8 kOhm ? Thanks for any information anyone can provide.
Answer Scott, the resistances on your thermistors are reading good. The 18 kOhm on the freezer is indicating a temperature around 5 degrees Fahrenheit and the refrigerator thermistor is indicating 35 degrees. To enter diagnostics, just to the outside of the first and the last LED should be hidden keys, these are the SW1 and SW2 that you would see in the service sheet that you are referencing. Once you activate the diagnostics, you can select the heating test and this will allow you to do a voltage test to make sure that the heater and in line bi-metal fuse are getting the 120VAC necessary to defrost. Read More... Answered by AppliancePartsPros.com | Wednesday, February 13, 2019