Mn T 9455 FX door not closing acts like the latch is not engaging without slamming the door
Possible causes - door switch, or door switch assembly out of adjustment; plastic latch guides on door switches worn; door hinge worn, causing door to be out of alignment. If it's the last one, the unit needs to be checked for microwave radiation.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0
Try 2 fixes
1) grease the latch (both latch and receptor side). veggie spray/wd-40 if you aren't squeamish about fumes...
2) failing this, use a t-20 torx screw to open it up and use a wire tied at the top, through the bottom door latch receptor, the to the bottom of the oven to keep it in place (towards the oven center). This will prevent it from bending out of alignment. 
Forgot to mention you probably need to unscrew the assembly and bend the metal back to alignment first. It will be bent away from the oven center if it is not latching.
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SOURCE: door will not latch
The door switch mechanism is broken. Microwave doors have a special arraingement of double switches to ensure it is not open during cooking. Because everything is made from plastic nowadays, stuff like this breaks easily. The switches are commona nd cheap but the mounting parts may not be.
SOURCE: door does not latch close
If
you gently push up on the door latches (hook-like devices on the door)
there should be spring tension. If they just flop right up, the spring
is off.
Normally the problem is not the spring, but a broken
spring mounting tab on the door latch head (hook) assembly or the inner
door panel.
If it's the door panel, it's usually easier and cheaper to use epoxy and some kind of hardware to fashion a new spring mount.
The door latch head (hook) is easy to replace or repair if that's the issue.
You can order Panasonic parts here.
We have critical safety & disassembly info at our site, linked here.
Normally
you have to separate the door panels (as shown in the attached photo)
and then you'll see the screws you need to remove.
Or you can watch a YouTube video (not a video I made) here that demonstrates how it's done.
SOURCE: door does not secure when closed
Hi , Either you have a faulty door interlock switch(es), or the door latches (on the door) have been damaged and will not activate the interlocks. either way, you have to be conversant with adjusting microwave latch assemblies once the repair has been effected AND THE USE OF AN OVEN LEAK DETECTOR IS IMPERATIVE for final testing or the end user will be subjected to harmful levels of microwave radiation.
SOURCE: the door won't latch closed and the door release
I have the NN-T994 SFR model and it had a switch that was staying depressed. I removed the screws to (in my case) the stainless steel cabinet, removed the cabinet and unhooked the wires to lay it aside. Found that the switch was cracked or broken, glued it back exactly as it was, then put the cabinet back on and it fixed it! Now about a year later, I have another problem...oh well. Hope this works on yours.
SOURCE: I have a Panasonic Inverter Model NN-T664.It acts
This
is usually caused by either a bad door switch or a loose door switch
mount, which are pretty simple problems to fix.
Even though a door
switch clicks, it may still be bad inside.
Door switch
or mount trouble is usually 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 the switch mount is broken, it's usually more economical and
safer to add a dab or two of hot glue to the mount to secure the
switch. Let it cool for about 30 minutes before using.
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.
If you only need a
switch, you can order a universal type here for $5 postpaid.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Testimonial: "THIS SOUNDS LIKE EXACTLY WHAT THE MICROWAVE IS DOING.. I BELIEVE NOW IT MAY BE WORTH REPAIRING. THANKS"
Door catches.
If one of the latches has broken off and
is not lifting the other latch clear of the housing. Remove from any
power source, remove the cover of the cabinet. Slacken off the clamp
mechanism and ease the clamp over the guide to allow the door to
open. When a new door lever is in place, the door may be easily
adjusted by slackening off the screws that clamp the door
catch/actuators in place whilst holding the door closed and then
tightening the screws. The rear of the door may be adjusted by
slackening the lower door hinge screws and adjusting as required.
I
hope that helps.
Door switches
If one of the door interlock switches
is not switching properly, that can cause the turntable/light to come
on even though the "Starts" button has not been depressed
due to the wiring of the switches.
Check for faulty door switches
and/or contaminated actuators.
I hope that helps.
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