Question about Microwave Ovens
We have continuing problem with microwave. Load, shut door, set timer, and start. After various times of proper functioning, microwave shuts down (or stutters on and off, although timer still counts down smoothly. Pressing start button will sometimes restart microwaving. Pressing stop button stops timer, and then restarting will often give a cycle with no problems. Holding start touch pad button during starting until the microwave works smoothly for several seconds also seems to help prevent the stuttering or shut off. Is this just a problem with the start touch pad button?
This is usually caused by either a bad door switch, a loose door switch mount, or occasionally a problem on the control panel.
On these, it's usually a broken tab on the upper switch holder.
One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.
That sounds like what's happening when you hold the Start pad - maybe you're moving the frame and chassis enough to help it work.
Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.
Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.
There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.
The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.
Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.
If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.
You can probably find exploded views and order parts by entering your model number here at the Sears parts site.
The best place to order Sharp parts is Tritronics.
If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
William E. Miller
Posted on Aug 19, 2008
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