Question about Microwave Ovens

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Panasonic Microwave NN-CT552W has no power - plug fuse ok - Has it got a thermal cut out or internal fuse? - Unit was ok after cooking some jacket potatoes

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All microwaves has both internal thermal cut out and internal fuse, Yours problem sounds like an open 9 volts transformer that power up the front panel

Posted on Nov 07, 2014

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  • Microwave Ovens Expert
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Many ovens have multiple thermal cut-outs. After checking the main fuse (typically inside the cabinet where the power cord enters), I'd check the thermal cut-out on the top or bottom of the cavity to see if it's open.

Posted on May 03, 2016

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Posted on Jan 02, 2017

SOURCE: russell hobs microwave oven

I am a recently retired appliance engineer of 20 years, microwaves are not normally things worked on yourself, i would be reluctant to help normally but yes there is an internal fuse ( a special quick blow type )just inside where the wire enters the cabinet on a small circuit board, if a replacement is needed it must be exact match bought from an electronic shop, microwaves are dangerous they store powerful electric and can still shock after removing the plug, if the replacement fuse blows, there is a fault elsewhere, and i do not recommend further self repair, work with safety

Posted on Sep 09, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: Microwave Panasonic Genius Prestige Model

A microwave can be dead for many reasons.

It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

The TCOs you need to be concerned usually with have all black or white wires only. Please reply with photos of your interior if you have questions.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

You can order Panasonic parts here.

You can find an authorized Panasonic servicer here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Sep 28, 2008

  • 108 Answers

SOURCE: Did I blow it up????

After washing you need to poke holes in potatoe skins or the steam can cause them to explode. Cook potatoes no longer than 6 to 8 minutes depending on your units power.

Microwave ovens can be very dangerous if damaged, so you will be safer to replace the unit. Better safe than sorry. Service on microwave ovens is not cost effective, and the newer ovens are very reasonable.

Ray

Posted on Nov 16, 2008

  • 1 Answer

SOURCE: Microwave stopped working while cooking. Is there a fuse?

If unit is built-in reove screws holding unit to cabinet.
Slide out about 2 inches to access 3 screws holding grill.
Remove grill to get to two screws holding control panel.
Fuse is behind control panel,

Posted on Mar 17, 2009

  • 1 Answer

SOURCE: NEFF MICROWAVE OVEN BLOWS 10A INTERNAL FUSE

We had the same problem, got Neff service engineer to come out after taking out insurance. He said the megatron cracks which is a large magnet and causes the fuse board to blow and needs to be replaced. This occurs through lack of ventilation on instalation. Total cost £370 may as well get a new one. Plus our insurance wouldn't pay the cost and cancelled the insurance policy.

Posted on Jun 08, 2009

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1 Answer

My model is nn-s253wf, micowave stopped working, no power, checked circuit breaker, is ok ?, unplugged, then plugged back in, still no power ?


Inside the external case and usually to the right left ( from Front) in some models There is a 30 amp fuse ( This may vatry on oven output amperage) Replace that and you should be back in cook mode.
Removing the case you should remember to disconnect from the power plug.

Please rate my help++++Thanks for using FIXYA

May 29, 2010 | Panasonic NN-S252WF Microwave Oven

1 Answer

Just went dead after operating a few seconds


could be a cavity thermal located top left side of cavity under the cover

Feb 04, 2010 | Panasonic NN-P295SF Microwave Oven

2 Answers

Fuse blows on microwave switch on


one of three things shorted could cause this: H.V. diode,capacitor,or the magnetron tube, take screw driver and short terminals on capacitor before touching anything inside the case, then chk resistance on capacitor should show infinite after needle settles, diode should show hi resistance one way and a lower resistance in the other direction(use the RX100 scale not the RX1) on both parts diode should not show very low resistance or it could be leaking,mag is a different story,it can be chk'd but in a different way

Jul 24, 2009 | Panasonic NN-H275 Microwave Oven

2 Answers

Microwes panasonic nn-t553w


hi, check that the cooling fan is operating and to sufficient speed to cool the magnetron or the thermal cutout mounted to the magnetron will cut power

Mar 06, 2009 | Panasonic NN-S753 Microwave Oven

1 Answer

No power to the unit, fuse tested fine, outlet is working


Sorry, but your subject line got cut off.

Assuming the outlet is fine, it may be a thermal cutout / thermostat on the magnetron or on top of the cavity.

The best place to order parts for this brand is Encompass (formerly Tritronics). Or you can call them toll-free at 866-779-5835.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Jan 02, 2009 | Panasonic NN-H764 Microwave Oven

1 Answer

Panasonic NN-S254B How fried is it?


There is an internal fuse, so check that first. If the fuse checks ok, definitely buy a new microwave - losing a neutral usually damages the main circuit board. Given the cost of the board and the distance involved, it just wouldn't pay to chase the parts down

Jun 18, 2008 | Panasonic NN-S254BF Microwave Oven

1 Answer

Panasonic NN-P294SF dead


Yes, there will be a fuse and also on or above the magnetron, there will be a thermal cutout or thermostat, and one on the top of the cavity.

But here is our long answer on a dead microwave:

A microwave can be dead for many reasons.

If the fuse is good, it may be an open thermostat or thermal cutout / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

Please feel free to contact me directly if you need more help.

We're happy to help and we appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

May 19, 2008 | Panasonic NN-P294SF Microwave Oven

2 Answers

My microwave died


A microwave can be dead for many reasons.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the thermostat to open. When it cools, it closes the circuit and allows power through again.

If it's random, it may be a bad connection, usually on the control board or fuse holder.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

At our site, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information.

See our listing here on FixYa: http://tinyurl.com/yzjozk

Oct 20, 2007 | Panasonic NN-S251 Microwave Oven

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