The dryer would not start, panel displays were normal. The heater element was burned out and warped, the thermal fuse was blown. The outlet thermistor measured OK along with the thermal cutout and high limit thermostat assy. I replaced the heater, thermal fuse, and the outlet thermistor. I fully cleaned the vent line, which was very dirty and restricted.
The machine started up and appeared to work, and I ran through the diagnostics to be sure. I got an active F25 code, so I followed the procedure in the tech sheet and checked the connections to the inlet thermistor. Everything looked good, so I replaced the thermistor/high limit assy. (The old thermistor measured OK upon checking it). The F25 still comes up in the diagnostics. I measured the resistance from the thermistor connector back to the circuit board and got about 15K ohms.
The machine seems to operate properly, even with the code. What’s next?
Not sure where/how you are measuring.
But you said you had replaced it and the resistance was the same as the old one so I assumed it was OK.
Looking at the resistance to temperature chart Page 7 in the tech sheet, it should be about 62 Kohms at 68 degrees F.
I would think they are measuring with it disconnected.
I measured the thermistor resistance and it was within the table limits. Next, since the error code means theres a short in the measuring circuit, I measured the resistance between the harness wires while it was disconnected from the thermistor, looking for a short. It read about 16k ohms, which must be the internal resistance on the control board. It didn’t measure zero, so the fault code must be in error. Is this worth going after??