Question about Kenmore 62622 Microwave Oven

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Internal light does not come on

Kenmore model 721 62644200. Everything works perfectly except the internal light. Bulb looks good and tests good using an ohm meter. Might the bulb still be bad? Or is the problem more complex?
Dennis Morelli

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Relay RY1 on the control circuit board has probably failed.

It's the relay closest to connector CN1, the 7-pin connector.

Have you had trouble with the cooktop lights of hood vent exhaust fan recently?

We regularly repair such control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Feel free to contact me directly (and please remind me of your full model number 721.62644200) for more information & help or see our Web site.


We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. "Ed" Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com


Internal light does not come on - 4980864.jpg

Posted on Feb 15, 2009

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I found that by tapping the control panel, the internal light would flash. I opened the control panel and started tapping on circuit board components until I found one that seemed to consistently make the light flash. I resoldered the pins on the loose component and this completely solved the problem.

Posted on Feb 15, 2009

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Microwave no longer heats up food


A model number would help us help you pretty specifically, but without it, here's a generic answer.

Generally, the most common causes of a failure to heat are:

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If the inside light, turntable, and internal cooling fan are not working, then it's probably a door switch. See my door switch help file here.

If the inside light, turntable, and internal cooling fan are working, then the problem is likely in the high voltage section.

In that case, here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
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http://www.gallawa.com/microtech/mag_test.html

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You can find links to helpful exploded view diagrams and order parts here.

I'd recommend that your bookmark this link to your favorites.


We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Possibly the internal fuse. Unplug unit, remove all case screws on the back of the micro. Slide the case toward the back and remove. Look for a glass tube type fuse, simular to automotive fuses of the past. It should be located near the controls. If bad, the internal wire will be broken or burned, I have been able to find replacements at Radio Shack. Take the old one with you. If the fuse is good, I'm sorry, it's beyond my microwave knowledge level.

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These remarks are not make and model specific.

Did you test the new light bulb?

I would not normally expect a burned out light to trip a breaker.

You may have a blown fuse. I suspect the fuse you see is to protect the oven. If you popped a breaker, you may have blown a fuse. I'd be looking for a short somewhere, maybe in the wire that powers the light, maybe in the hardwire that supplies the oven.

Make sure you turn the power off before you go poking around. And, above all, avoid the silver can inside, it IS lethal.

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hello. i can help you.

When the microwave sounds okay, but there's no heat, one of the internal door switches, the high voltage circuitry, or the circuit board may have a problem. To resolve this problem, you need the assistance of a qualified appliance repair technician.

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We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid in about a week.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

The lights fan can be inoperable or stuck on or no bright, too. Sometimes this will similarly affect the exhaust fan operation, too.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

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The light isn't a safety issue but I would think that the fan would be.

The fan is designed to remove excess heat from unit and keep it cool. Without the fan, you're now operating the unit under conditions that it wasn't designed for.

With the unit unplugged, try removing the cover and see if a fuse has blown. If so, replace it with the EXACT value of the original.

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