When we close the door, the microwave runs then a clicking noise starts and the machine shuts off and never heats at all. Power is normal, the turntable turns, light is on, all input functions are accepted and available, but no heat and lots of clicking until the machine just shuts off. Any suggestions??
SOURCE: NN-T990SA Panasonic Microwave Stopped Heating
This model uses an inverter to produce high voltage instead of a convential transformer system. While an inverter (switched-mode power supply) is more efficient from a power consumption standpoint, it is more complex, thus more statistically prone to fail. These should only be examined and worked on by someone who has the necessary technical qualifications. Seriously. Often the machine-soldered connections in a microwave inverter are too weak, so they eventually fail, especially if heat is high in the area. They sometimes fail catastrophically. When not catastrophically damaged, you may hear clicking or squealing and may smell an electrical odor, which is sometimes obscured by the cooling fan. Some manufacturers do not encourage or assist technicians to repair microwave inverters. Most offer the inverter as a whole assembly. But sometimes that is actually cheaper than the time and labor required to fix the old one. If a technician is willing and able to troubleshoot and repair the inverter to component level, it will may be expensive, but may be worth it, especially if he or she will resolder and reinforce connections as needed as part of a thorough repair. That could easily make your inverter beter than a new one! You might be able to get some verbal estimates if you call Panasonic-authorized repair shops and ask then specifically about inverter repair and inverter replacement costs for your model number.
SOURCE: Microwave turntable won't stop running
This is usually caused by either a bad door switch, but may instead be a loose door switch mount or a problem on the control panel.
Even though a door switch clicks, it may still be bad inside.
If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, linked here on Fixya: http://tinyurl.com/yzjozk
SOURCE: when I open my microwave door, it starts running
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In most cases, it's not actually cooking, but instead the fan, turtable and light may be on. Yet it does need attention.
What this usually means is that you have a shorted door switch or a bad door switch mount.
It's easy to tell if it's actually cooking, just place a cup of water inside and see if it heats.
If so, that could mean a stuck relay on the control board. If so, we repair these for customers nationwide with our guaranteed $39.95 service. Far less than a new board.
If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk
Please write back with more details if you need further help.
We're happy to help and we appreciate your thoughtful rating of our answer.
SOURCE: Microwave will not turn off
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 (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 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.
There may also
be a "mini-manual" hidden inside the unit behind the control panel or
hidden on the left side behind the grille, which is very helpful when
troubleshooting & testing.
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.
SOURCE: Microwave oven does not heat anything
Spacemaker XL 1400 worked for 7 years.Yesterday, no more heat. Also plastic door damaged.
will try Panasonic or something commercial
It sounds like the magnetron may have
either failed or is not being supplied with the extremely high
voltage required to run it.
Make sure the !!!!capacitor is
discharged!!!!! before attempting any sort of repair.
Check
the door interlock switches first then the high voltage diode with
either an AVO model 8 on high resistance range for short circuit, the
capacitor can fail and go short circuit, the feed fuse on the primary
of the high voltage transformer and then finally, the magnetron is
best checked by substitution.
Hope that helps.
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