The dryer would heat up when first started but would cool down after a few minutes although the drum would turn as normal and it would shutdown at the end of the time cycle that was set. Being a retired eletronics tech. I had a look to see if the problem was obvious. I found that the diode (D1) was open on the electronic control board (Whirlpool # 8558178) so I replaced it. When the card was reinserted the same problem persisted although diode did not blow again. Not being equipped to check the PFM IC I cannot go any further with my truble shooting. When I run the dryer with the control board removed the dryer continues to heat but I imagine that control of the heat setting is no longer in play.
Your advice would be appreciated.
ANSWER Hello Clive,
You may want to check your venting to make sure that it is not clogged. A clogged vent will cause unit to cycle the heat off due to overtemp. This could cause the thermal fuse to eventually blow. Also check the cycling thermostat to make sure that it is not opening and staying open.
Answered by AppliancePartsPros.com | Tuesday, January 29, 2013