Need appliance parts? Call 877-803-7957 now or use the parts search box:

Parts Search

Learn how to troubleshoot like a Master Samurai Tech...

Click here to check out our structured, online appliance repair training courses for rookies and experienced techs.

FAQs | Repair Videos | Academy | Newsletter | Podcast | Contact

Stay connected with us...

Samurai on Facebook - become a fan today! Sign up for our free newsletter and keep up with all things Appliantology. Subscribe to our YouTube channel for lots of appliance repair tips and help! Follow the Samurai on Twitter and get timely morsels of Appliantological Wisdom! Subscribe to our MST Radio podcast to learn secrets of the trade.

KA Microwave/Oven Combo - Start Oven and "DOOR" flashes

2 posts in this topic

This has come up at least twice and on two completely different models/control boards (after re-installing a newly rebuilt control), but for exact same reason.


First the Symptom Description:


1. When using microwave only the magnetron comes on.

2. When you turn on the oven light the microwave light comes on.

3. When you engage the oven "DOOR" is periodically displayed, microwave light comes on and turntable turns.


The Cause:


OK, so on the first type: model RMC305 / control board 4448877 wire harnesses that connect to board connectors P7 and P4 are swapped (4 pin molex).

On the second type: model KEMC377K / control board 4453377 wire harnesses that connect to board connectors P8 and P3 are swapped (4 molded spade connectors).


Here's what it looks like from a schematic point of view:



Here's the back of the two different control board styles:


Share this post

Link to post
Share on other sites

Need appliance parts? Call 877-803-7957 now!

or the dammm microswich bracket

Share this post

Link to post
Share on other sites