Since the heating element turns on when the heater relay on the control board is bypassed, the problem must be the control thermistor. It is the one on the wiring diagram inside a circle and located on the blower housing. The indicated resistance of 50000 ohms is the resistance of the thermistor at room temperature. It goes down as the dryer heats up and when the dryer temperature is too hot and the thermistor resistance is too low, the control board turns off the heater relay.
The problem here must be the control thermistor. Its resistance must be too low or even shorted thereby making the control board "think" the dryer is too hot and therefore does not turn on the heater relay at all. Check the resistance of the control thermistor which must be around 50000 ohms at room temperature. Measure the resistance with the thermistor connected and disconnected. If the resistance is good when disconnected but not when connected, then the wires must be shorted somewhere else since the control board has been replaced. Locate the short circuit or simply replace the wire harness.
Hi,
Check
your heating element..
A
bad heating element causes many problems in dishwashers...
Dishwasher
Problems The Heating
Element not Working
How
to Replace the Dishwasher Heating Element
Dishwasher
Maintenance
heatman101
Asker's Testimonial " explanation very clear. will give
it a go and see how simple it was. thanks Ronnie " -
ronnieshomes
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