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Microwave door bottom hook no longer makes contact with contact inside oven (pushed in to far) to let machine know that door is sealed so oven will not turn on

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Yikes, thats definitely a problem, so you can tell it isn't engaging all the way? Or it does go in all the way, but just doesn't work? It sounds like the "contact" or "sensor" may actually be bad, unless you are certain it is not closing all the way, in that case it could be just the hinge is the issue, or the door is warped. Can you tell which it may be?

Give me some more information here and I can help.


Posted on Sep 30, 2010


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One of the door latch arms or the latching mechanism inside the oven have broken. you may have to buy a complete door lock / latching assembly . Might not be worth it. Check with your nearest parts supplier.

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My SMH4150 microwave appears to be working, but is not heating . It is 5 years old and there is a smell of burning plastic. Everything else seems fine.

Check the door safety interlock switches.

Do you regularly shut the machine off by opening the door? Each event causes a small arc on the tiny contacts and will burn them. When they can no longer make contact, your microwave doesn't know if the door is open or closed. The machine must know the door is closed to turn in the magnatron (that thing that makes the heat).

Remove the cover and check the microw switches with a volt/omh meter.

Thanks for your interest in

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I have had some success by taking WD-40 and lifting up on the hooks sticking out of the door and spray under the Bottom part of the hook into the door area. That lever guides through a metal slot that is part of the inner door. Sometimes that will help. I know you have to open the door but yanking it like that will eventually break off the metal huide part of the door and the inner door will have to be replaced.

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The push button on the door no longer opens the microwave. How can I get the door open? How can I fix this?

the only way to open a broken door lock if from the inside the unit,
but its far from an easy job, and if you done know what your doing insind the microwave my advice is,,, dont go in it,,,there will be 1000's of volts kicking about inside of this unit, one tuch in the wrong place and you may end up very dead! volts kill,, 1000; kill quicker
if its a good unit have it repaired, if its old buy a new one?

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Most microwave ovens have catches that are shaped like hooks, these hooks catch on a fixed bolt or a raise in the frame of the oven.

The next time you get the oven open check these hooks to see if the springs are working in a strong positive manner, or if you have to push a button on the model check to see that the button releases the hooks.

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2 Answers

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The plastic cover on the inside of the door is purely push fit.
To force it off I used 2 strong stainless steel dinner knives.
By easing one knife between the internal glass and the plastic cover I managed to spring one corner by using the other knife on the external bottom edge of the plastic cover.
Try concentrating on one end and once this springs out it is easy to free the rest without having to take it off completely.
The hook is simple to do but be careful with the spring.
All in all it took 3 minutes!

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It sounds like the mount which holds tension on your door latch heads (door hooks) is broken. You can confirm that by pushing up on the door hook. If it goes up with no real resistance, the spring is unhooked. Fixing that would require disassembly of the door (by separating the panels) and repairing or replacing either the door hook assembly or the door panel inside.

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