[mtbike]

I believe I need to replace the magnetron. Can someone direct me to some directions on how to get at it. I need some directions before I purchase a new one.

The microwave shuts down in 3 sec , but if I put it a 0 power it will run forever. I read here that it may be RF leakage from the magnetron

Thanks for your help
MikeB.

[Gene]

Hi Mike,

You have to remove the microwave from the oven cabinet first. The instructions are attached to the reply.

- The magnetron Part number: 4375072

Here are the breakdown diagrams and Replacement parts for Whirlpool GMC305PDQ2 ELECTRIC OVEN/MW COMBO | AppliancePartsPros.com

Gene.

[mtbike]

OK, so the symptoms are: microware runs and heats for 3 sec and then shuts off as if the door was opened. If the microwave is on 0 power, it will run forever. It is only when the magnetron kicks in that the unit will turn off

I replaced all 3 door switches and the magnetron. I checked the magnetron thermal switch and it is good. I am tired of throwing parts at this thng, but what else could it be. Next I was going for the capacitor. Any help would be appreciated.

Thanks

MikeB.

[Simon / APP Team]

Hi.

Did you check if the magnetron fan is working?

Also, check the cavity and magnetron thermal fuses when the microwave stops working.
If everything check out OK - then most likely it's the relay in the control board.

Thank you.

Simon.

[mtbike]

Simon - Thanks for the reply. Yes, the blower motor is working. I did verify the magnetron thermal cut-off is working (actually cuts off at about 170F - 180F Vs the 145F per spec). I did not verify the cavity thermal cut-off.

What would cause the relay to cut out? Most relays will fail to pick or fail to release. In this case, it will pick for 3 sec and then release.

Also, it seems that after I have worked on the unit, when I first power it up, all is good. I have run the unit for 10 mins w/o any issues (I put a few cups of water water in the microwave and it heats up just fine) It is the next day that it starts acting up again.

Thanks
MikeB.