I am having same issue.
This thread has been very informative. Thanks in advance
Here is scenerio
Control board has been replaced
Element, thermostat, high limit and cut off all show continuity.
Thermister is showing 11k resistance at room temp.
120v from motor to element and 120v from motor to control board means the centrifugal switch is working. (I took it apart and tested it, looks good)
I can run 120v directly from a wall sock to the element to turn it on. Additionally, if I run the vent blockage test, the heater works no problem.
With that being said I can only draw the conclusion that the thermister is defective or the sub PCM is defective. AKA its sending a "no heat" signal as those it is always on Air Fluff mode regardless of the actual setting being chosen.
I have 1 day delivery on the thermister coming tomorrow (im outta clean boxers here gentlemen). Any other ideas?
*edit: I've realized I didn't test the motor switch correctly. I am getting the 120v to the heater and I did witness the switch working with a multimeter when I took it apart and manually triggered it. However, the switch that controls the power going to the control board I did not properly test. (I tested the black wire into the heater relay which is continuous power)
With this revelation, the motor switch is still up for debate, however, running a vent blockage test turns on the heater. Should this alone rule out a faulty centrifugal switch? Or does the vent blockage test bypass various safeties and relays on the control board? Basically, I need to understand how the vent blockage test works so I can better troubleshoot the issue at hand