Author Topic: GE Microwave Cavity Light Stays On  (Read 4113 times)

Offline TechnicianBrian

  • Technician
  • Member Since: Dec 2007
  • Posts: 390
  • Country: us
    • TechnicianBrian.com
GE Microwave Cavity Light Stays On
« on: November 14, 2008, 05:24:50 AM »

Model #JE2160SF01icon, this counter top microwave operated and cooked as it should, but the light inside the oven cavity would stay on when the door was either open or closed. Not a big deal, but the customer didn't want to waste electricity having the light on all the time and risk needing an early bulb replacement.



Cavity lights in microwave ovens will generally illuminate the cavity when the door is opened, and also when the cooking cycle has begun to allow you to watch over your food. To do this, the lights will be powered directly by one of the door interlock switches, or indirectly by the control board monitoring one of the interlock switches. This will be done through the use of a number of interlock devices used to ensure the oven door is properly closed prior to activating the magnetron tube. These interlock switches are aligned and arranged to prevent someone from tampering with the door and attempting to start a cooking cycle while the door is open. The result of any purposeful interlock manipulation will be a dead microwave needing a service call.

Because of the symptom, I figured one of the interlock switches was either out of position, had a loose wire, or had simply failed. With the cover removed, I was able to do a resistance check on each switch and found one of the four was not changing state when actuated. This fourth switch directly powers the cavity lamp circuit when the door is in the open or closed position. It is also the only SPDT (single pole, double throw) switch of the four meaning it can power one circuit when open and another when closed.

With the failure identified, it was a simple repair requiring removal and replacement of the lamp control interlock switchicon, while paying close attention to the wires colors. Microwaves use locking terminal connectors which take a bit more accessibility to remove, but once completed, the light in this oven was only on when it needed to be.

Microwave Servicing Disclaimer

Offline JWWebster

  • Technician
  • Member Since: Jan 2008
  • Posts: 8780
  • Country: us
  • SublimeMasterJW
    • Buy me a beer through paypal
    • JW's Sublime Appliance Advice
Re: GE Microwave Cavity Light Stays On
« Reply #1 on: November 14, 2008, 07:57:52 AM »
One day a woman came into my shop looking for a microwave oven bulb. I sold her one and she was on her way. About an hour later she came back demanding a refund. I did a quick check with a meter and even put power to the bulb and showed her it was fine. She said she knew it would light up, trouble was it would not shut off! True story. :D
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
I love fan letters! LOL

Offline AJ

  • Technician
    Administrator
  • Member Since: Jun 2007
  • Posts: 9431
  • Country: us
    • ApplianceJunk.com - Appliance Repair
Re: GE Microwave Cavity Light Stays On
« Reply #2 on: November 14, 2008, 08:10:23 AM »
 ;D

 

Frigidaire Range Oven Light Stays On

Started by TechnicianBrian

Replies: 0
Views: 6154
Last post May 09, 2008, 07:26:14 AM
by TechnicianBrian
Kitchenaid Built-in Microwave no Cavity Lamp

Started by TechnicianBrian

Replies: 0
Views: 2776
Last post November 05, 2008, 05:28:15 AM
by TechnicianBrian
LIGHT BULB JVM1790SK01 over-the-range microwave

Started by jimbo6679

Replies: 4
Views: 1550
Last post May 20, 2012, 11:50:48 PM
by tgoods
How to replace the interior light on the microwave ? *see model # below.

Started by jakeblue

Replies: 2
Views: 1404
Last post October 25, 2010, 12:54:03 AM
by tgoods
Hot surface light stays on after using large front burner.

Started by rains

Replies: 1
Views: 1088
Last post May 23, 2012, 03:06:33 PM
by AJ
Broiler not working, oven light stays on

Started by michaeljc70

Replies: 2
Views: 2001
Last post July 27, 2012, 11:00:11 AM
by michaeljc70