The Heater Thermistor is mounted to the heater assembly located at the back of the unit. Remove all screws from the back cover to expose the heater assembly.
Below are examples of the thermistor and where it is mounted to the heater assembly…
The Thermistor can be checked from the main board also and should have resistance of approximately 280K ± 10% (see chart) . Be sure to check your model’s schematic to verify test points. Example from DLHX4072…