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JIMMIEM  
#1 Posted : Saturday, February 3, 2018 9:14:54 AM(UTC)
JIMMIEM

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Microwave runs but does not heat. I have checked fuses, door switches, capacitor, diode, magnetron, and transformer and all test OK. I did find a scorch mark on the wire on the output side of the thermal fuse but both the wire and the fuse had continuity. My testing showed that there is no a/c power going into the transformer. Could the Main Control Board be the problem? If so, is there any way to test it? Thank You.
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ThatGuy  
#2 Posted : Sunday, February 4, 2018 6:07:32 AM(UTC)
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Check your control board. It might be a bad relay or a burnt trace.

There should be 120 volts to the primary side of the transformer when MW is running.

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JIMMIEM  
#3 Posted : Monday, February 5, 2018 8:27:49 AM(UTC)
JIMMIEM

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I followed the test procedure that was on the literature that was tucked behind the Control Board. The testing was pointing toward either the Control Board or Transformer. But then microwave heated the cup of water I had placed inside. Loose wire? Reset Relay?
ThatGuy  
#4 Posted : Monday, February 5, 2018 8:05:22 PM(UTC)
ThatGuy

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Stuck relay, burnt contacts in the relay, or bad solder joints on the board.
JIMMIEM  
#5 Posted : Tuesday, February 6, 2018 8:48:56 AM(UTC)
JIMMIEM

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Originally Posted by: ThatGuy Go to Quoted Post
Stuck relay, burnt contacts in the relay, or bad solder joints on the board.


Can I replace the relay or do I have to replace the entire control board? If the relay is replaceable what info do I need from the relay body? There is a lot of info printed on it. Thank You.
ThatGuy  
#6 Posted : Tuesday, February 6, 2018 1:49:38 PM(UTC)
ThatGuy

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Have you taken the board out and checked for burnt traces or bad soldier connections? Are you sure the relay is bad?

Yes, if its just the relay you can replace it. You need to be proficient at soldering.

This is just a random picture of a relay from the internet. If you look at it, Omron is the manufacturer. G5J-1-TP-M-ER18 is the part number. It's an 18 volt relay.

Do a search for your part number. Check Google, Epay, Digikey, Mouser, etc.
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JIMMIEM  
#7 Posted : Tuesday, February 6, 2018 2:19:29 PM(UTC)
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The microwave is working now. I was guessing it was the relay as the manufacturer's trouble shooting flow chart said to check it's voltage. Would testing reset it? If the relay requires soldering then I'm out of luck.....I don't own soldering equipment and have never soldered. If the microwave fails again I'll just buy a new one or replace the failed part. It's an over-the-stove model so a little more expensive than a counter top model.
ThatGuy  
#8 Posted : Tuesday, February 6, 2018 7:20:04 PM(UTC)
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If the board was out and I had the part , I could replace it in less than 10 minutes. Its really pretty simple. Maybe you could take it to a friend and they could solder it for you.

The relay probably has burnt contacts and the carbon was keeping it from completing the circuit. Bouncing around probably cleared off enough to get it going for awhile.
JIMMIEM  
#9 Posted : Tuesday, February 6, 2018 8:01:02 PM(UTC)
JIMMIEM

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Another thing that I saw was the plastic that housed the female disconnect to the Thermal cut out fuse was burnt. The fuse tested fine. I'm wondering if the fuse's male blade wound up between the outside of the female part and the plastic insulator. The fuse blade is a little loose so I've ordered a new fuse.
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