Kenmore dryer, 110.78932790, shuts off after start button is released.

Look here:

This is also a very good read for you:

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Hi Home Guy,

Take a bow. You certainly hit the nail on the head with the link to that explanation. In addition to replacing the zener diodes, I would also suggest checking out the filter capacitors with an ESR meter. Those capacitors may have contributed to the failure. Hopefully my friend will be able to put the machine in factory test mode and determine the condition of the control board.

Thanks for your reply.

Hi, Even if only one looks bad. Replace both Zener diode and cap. They are strained, That is what repair tech does.

Do you happen to know the value and reference number of the cap?

Thanks for your reply.

I removed the old diodes today and found one was shorted, while the other two were open. The caps checked good so no need to replace them. I installed the new diodes and it works fine now.

Thanks again for the tip.

Hey, it was a lucky find, but maybe it's a common problem for those dryers. Glad I could help.

The guy that performed the original fix and posted about it on that blog deserves the credit. :)

I Googled that model number and problem every which way and didn't find the tip (possibly because the model numbers were different by one digit). Without it, I would have been troubleshooting for at least a couple of hours and then would have had to make a second trip to buy parts. This way, I came prepared with the parts and repaired it in under an hour.

Thanks for your reply.