I connected LED bulb (LED - 10w, 60w equivalent) to connectors and I see it flickering (when microwave is in on or off mode.

Incandescent. Use an incandescent.

 

Incandescent. Use an incandescent.

I don't see any light when I connect 40w incandescent bulb

 

Like i said Earlier!! Put the Magnetron feed from P26-2 to P27-2 to proove the magnetron is working...

 

Like i said Earlier!! Put the Magnetron feed from P26-2 to P27-2 to proove the magnetron is working...

I don't exactly understand your statement. Can you please elaborate?

Are you suggesting connecting P27-2 to HV transformer input?

 

Yes

 

So, there are two wires going into HV transformer (R and BU).

Just to confirm:

Should I remove BU going into Magnetron Fan and instead feed onto HV transformer (in place of R connector input for HV)? And keep BU connected to second HV terminal as is. In this case, Magnetron fan and turntable will be disconnected - is it okay to feed HV transformer without magnetron fan connected?

Or should I continue to feed BU into magnetron fan, but also connect a wire from that BU to HV transformer terminal (in place of R connector input for HV).

I just want to make sure I am getting it right and don't cause other problems.

Thanks.

 

Yes, Connect the magnetron to the fan and motor feed, so all 3 are powered on at the same time on P27-2 connection.

 

When you say connect the magnetron - you meant connect P27-2 feed to HV transformer input, correct? So, basically I am removing red wire from HV input and instead connecting BLU (27-2) to where Red was connected on HV transformer.

 

Yes yes yes.. .

 

Yes yes yes.. .

Alright, so that worked. So, it seems HV circuit including transformer, capacitor and magnetron are good. Finally, it feels like I am getting close, so thank you for that advise. Greatly appreciated...

Does this pretty much confirm it's relay (P26-2 R) problem or should I verify anything else? In circuit diagram, there is something called magnetron T.O.D. connected to P26-2 R. Not sure what that is...

Here is the picture of the relay I have on circuit board.

https://i.postimg.cc/Kvj6hzXB/IMG_0659.jpg

Any advise on where can I find replacement? I don't think it's a whirlpool model specific part.

 

If it's working fine leave it alone, otherwise you're looking at getting another relay to replace the faulty one, me i would get a slave relay and parallel the coils , and link it across the original bad contacts.

TOD is a thermal overload device.

 

If it's working fine leave it alone, otherwise you're looking at getting another relay to replace the faulty one, me i would get a slave relay and parallel the coils , and link it across the original bad contacts.

TOD is a thermal overload device.

Is it okay to reuse P27-2 this way by doubling it? I just used temporary connectors - so may have to find good way to connect wires properly. What's the best way to connect two clips on single pin?

 

Can you do better on the picture of the relay? Is it one of Potter and Brumfield units behind the connector?

 

I am attaching another pic.

First I thought the one with red/black wire is the problem relay. But, it's possible that relay is the one next to it. As you can see, there are several units next to each other. So, I am bit afraid of messing something up in the circuit board if I replace relay.

If there is no issue with keeping P27-2 feed both HV transformer and magnetron fan - I would go with that option.

 

Is it okay to reuse P27-2 this way by doubling it? I just used temporary connectors - so may have to find good way to connect wires properly. What's the best way to connect two clips on single pin?

I would measure the current on the relay output with all loads on, the relay is rated at 15A @120V.

 

It seems current is close to 15 A. I measured 14.xx, but multimeter I have is 10A only (might have blown multimeter fuse). Is the current too close to the relay capacity?

If that's the case, which relay part # do I need from the picture I posted earlier?

Thanks.

 

You need to search for a 24V coil, 15/30 Amp contacts , ideally with the same pinout to fit. Otherwise get one to suit and glue it and rewire it.

 

You need to search for a 24V coil, 15/30 Amp contacts , ideally with the same pinout to fit. Otherwise get one to suit and glue it and rewire it.

Just wanted to confirm that the problem relay is the one I marked in green circle (picture attached). It's next to R/BK P26-2 connector. Thanks.

 

The wires obscure the P/N. Is this the same as the one next to it - Potter and Brumfield RT334024F ?

 

The wires obscure the P/N. Is this the same as the one next to it - Potter and Brumfield RT334024F ?

https://www.digikey.com/product-det...r-brumfield-relays/RT334024F/PB966-ND/1095290

The coil is rated at 24 VDC. Can you get your voltmeter on the coil pins and confirm the relay is getting the 24 volts it needs?