After the microwave has finished cooking and shuts off, I push the spring loaded button to open the door and the microwave starts running again with the door open. (lights, turntable rotating and power sounds on) It still runs with door closed. Heats food. Will shut off if plug pulled.
I'd say the door interlock switch has failed, and supplies a connection when it should not. Microwave ovens can be dangerous to anyone poking around inside, even when unplugged, so get a quote from a service tech. You might find that parts+labour is almost as much as a new one.
Microwave radiation being released through an open door is also a hazard, as it is known to cause eye cataracts, so don't get near if the oven does this.
SOURCE: Shuts Off after 22 seconds
Time to buy a new microwave as it sounds as if the control panel is defective. A new control panel for this micro will run about 95 to 120 bucks + labor depending on where you buy it. I happen to like slightly burnt popcorn as well!! Nothing wrong with thats, as they say great minds think alike.
SOURCE: Panasonic NN-2501 Microwave Oven range hood
It is possible that the magnatron is bad but hard to say on a no heat problem without checking all components. A lot of model give 5-7 yr warranty on that part.
SOURCE: Door shut off malfunction
I have the same problem starting yesterday April 19. Have you gotten any answers.
SOURCE: The turntable keeps rotating when the dooe is open - Panasonic T994SFR
This is usually caused by either a bad door switch, a loose door switch mount, or occasionally a problem on the control panel.
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. Other times, 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.
One test that sometimes helps is to gently lift up 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.
We have critical safety & disassembly info (including a how-to video) at our site, linked here.
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 and we'd appreciate your
thoughtful rating of our answer.
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