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When micro oven switch on short circuited and MCB got down

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Posted on Apr 27, 2010

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H7871SOGB/03 combi. Why isn't it working?


The fact the breaker in the fusebox tripped indicates a fault in the appliance that is probably safety related. If it was the mcb (micro circuit breaker) it indicates a sudden overload. If it was the rcd (residual current device) it indicates there might have been a live circuit shorted to earth.

The fault is likely to be internal and it is potentially dangerous for unqualified people to fiddle about inside microwave ovens. Many brands are cheap throw-away items these days because a visit to the repair shop tends to cost more than a replacement.

The Neff brand is a premium brand and although repair costs are expensive it is likely to be (marginally) cheaper than a replacement.

Sep 04, 2015 | Neff Microwave Ovens

1 Answer

Replaced the 20amp fuse in my microwave. Clock and all lights work but oven will not heat


one or more of the door micro switches are open or shorted..the micro switches tell the unit the door is closed and safe to use.the micro switched are marked normally open or closed..take note when replaceing them..also their is a actuator lever that tells the switch to close or open..it is plastic and connected to the door latch..it can be broken off or bent from heat,,its plastic..make sure its in place and working the micro switch

Aug 15, 2014 | Microwave Ovens

1 Answer

Why r 872 blowing 8w ceramic fuse repeatedly


Most microwaves usually use 15 amp fuses and not 8's. If it keeps blowing fuses there is a short circuit somewhere and you would need to track that down to stop your problem. A frequent possibility might be one of the micro switches in the door circuit.

Aug 13, 2014 | Sharp Microwave Ovens

1 Answer

The oven cuts out after counting down from 1 minute at 38 seconds and no heat


No heat is typically failed micro switch's that act as the door safety interlock. Remove the cabinet to find the tiny switches. Test them for proper action. Should show open or short depending on whether the door is open or closed.

May 14, 2011 | Neff H5642 Convection / Microwave Oven

2 Answers

Hi, in my home every electical applience works well. But when i switch on microwave oven the power to house will go off. MCB trips i think oven drawing more current/power. what might be the problem...


Hi,

There is a dead short in side the microwave... this is causing the breaker to trip...however you should also replace the breaker to the microwave, as that should trip before the MCB...unless both are tripping at the same time...


Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

May 12, 2011 | Westinghouse WST3504 Microwave Oven

1 Answer

I keep blowing my 20 amp fuse, replaced mag tube and diode


Check the HV capacitor. It may be short circuited.
Also check the door switches. One of the switches (the monitor switch) is connected directly across the power and is there to blow the fuse in the event that the timing of the door switches are incorrect.
The monitor switches on Panasonic micros will also short.

Jan 04, 2011 | Microwave Ovens

1 Answer

Micro blow circuit


You have a faulty interlock switch. This is one of two or three switches in every microwave that are operated by the door. The interlock switch is wired to blow the fuse if you try to run the oven with the door open. The switch may have gotten knocked out of adjustment (say by slamming the oven door) or its contacts stuck closed. If there are no other problems with the oven, a new switch should clear this up.

Mar 24, 2009 | LG LMV1630 Convection/Microwave Oven

2 Answers

LG micro oven it not heat


I am not an expert on Miocrowave ovens, but from past experience I know that they have a number of micro-switches on the door as safety devices. If these switches are faulty, the last safety feature is to short the supply and blow the fuse to stop the microwave from operating in an unsafe condition. Obviously the switches would have to be checked first before jumping to any conclusions and a number of other faults would probably cause the fuse to blow as well.

Jan 11, 2009 | LG LRM1230W Microwave Oven

1 Answer

Sunbeam SMW5500 micro/convection oven shorted out when opening door


You are decribing a typical Door Safety Switch problem. The Door Safety Switches has Failed.The Door Safety Switch is designed to shut down the Micro in the event the Micro is still cooking when the door is being opened. The first "Click" of the switch cuts off the "Cook". If it does not cut off the "Cook", the second "Click" blows the power. Otherwise it would "Cook" with the door open, and I need not to tell you how DANGEROUS that could be. It first Tripped the Circuit Breaker which supplies power to the Microwave. After Re-Setting the Breaker the same thing happened except this time the Micro is DEAD- not even a light working. Yes, there is a line FUSE inside the Micro. You however need to address the Door Switch SHORT before replacing the fuse. If not, it will just Blow The Fuse Again, and Again, until the Short is corrected.
Call around, ask How much to replace a Door Safety Switch.
Good Luck!

Feb 15, 2008 | Microwave Ovens

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