Question about Panasonic NN-H764 Microwave Oven

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Periodicallytripping of a GFCI on a 2 circuit shared ground

I have two circuits that share the same ground. I have a GFCI on one of the hot legs and periodically this GFCI trips. There seems to be no pattern of when it trips (e.g. turn on an appliance or a light of etc). What causes a GFCI to trip? How can I trouble shoot this? Should I change wires from the fuse panel to the box? Should I disconnect appliances, and add them one at a time to see if one is the cause? Other ideas? This happens 3 -5 times a day.

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Are you talking same ground or do you mean shared neutral on a multi-wire branch circuit???If this the case one appliance may draw more current on that phase and the current imbalance is sensed by the g.f.c.i.

Posted on Jul 27, 2009

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2 Answers

I don't have a dedicated circuit for a only microwave oven use only. Is this necessary?


no
microwave ovens are a plug -in unit and be plugged into any socket (GPO outlet) that has the correct voltage for the unit

Jan 04, 2017 | Microwave Ovens

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What is the wattage of a Kitchen Aid microwave model # kcms135h?


1200 Watts. It should be plugged into its own dedicated 20-amp circuit. It is shares a circuit with a refrigerator, coffee maker, or toaster, it will pop your circuit breaker.

Oct 20, 2014 | Microwave Ovens

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I have a problem with my whirlpool microwave oven, all of a sudden it shut off the kitchen electricity and tripped the circuit breaker of the kitchen, I unplug the oven and reset the circuit breaker, but...


Hi heshamyg, I want to help you with your problem, but I need more information from you.
Since I could not find the electrical specs for your particular model in the user's guide, please locate the information tag (plate or decal) and tell me what the wattage and amperage ratings are.
Page 5 of your user's manual recommends that your microwave should be used on a 15 or 20 amp circuit And that a "separate circuit servicing only this appliance be provided."
I don't know if this appliance is a new install to your kitchen appliance array, or if this unit has been around and in use for awhile without any problems.
Either way, the electrical circuit is being overloaded; short circuited; or because of a ground fault.

An overloaded circuit is one primary reason for a breaker to trip. It occurs when a circuit has more connected electrical load than it is supposed to have. When more current runs through the circuit than the circuit was intended to take, the circuit breaker is designed to "break the circuit." It does so to prevent overheating of the wire in the circuit, which can cause a fire.

  • The most probable reason the breaker tripped is that you simply have too much plugged into one outlet or multiple outlets connected to one circuit.
  • Move lamps, heaters, irons, hair dryers and other heavy power consuming devices to a different circuit not being heavily used; or
  • Turn off some of the devices on the circuit to reduce the load.
  • Loose connections are another possible but less common cause. With power off, check outlets for a loose wire and the electrical service panel hot wire connected to the circuit breaker to see if it has become loose. Re-tighten the connections if necessary.
  • If these suggestions do not solve the problem you may have a more serious problem such as a Short Circuit or Ground Fault
The Short Circuit is a more serious reason for a breaker to trip. A short is caused when the hot wire (black) touches another hot wire or touches a neutral wire (white). It can also be caused if there is a break in a wire in the circuit. Shorts are a bit more difficult to diagnose because they can be caused by the wiring in your home or in something you have plugged into an outlet.

  • Confirm that the power is off at the outlet into which your device is plugged.
  • Inspect your power cords for damage or a melted appearance.
  • Check your outlets and plugs for the smell of burning- or look to see if there is any visible brown or black discoloration.
  • Check the insulation on the wires to make sure that they are not cracked; and that bare (uninsulated) black and white wires aren't touching together.
  • If you do not find the problem, repeat the process for all the outlets in the circuit.
  • Check for a Ground Fault condition.
A Ground Fault Condition is defined as: An unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment or earth.
In simpler terms, a ground fault condition exists when the hot wire (black) touches the ground wire (bare copper) or the side of a metal outlet box (because the metal box is connected to the ground wire). The ground fault is a type of short circuit.

The fix is the same as a short circuit except check that the hot wire (black ) is not touching the side of the metal outlet box or the ground wire.

If the problem is internal to the microwave oven, have it serviced by a properly trained service technician since one could expose themselves to dangerous levels of microwave energy.

Please keep me posted. Thank-you.

Dec 02, 2013 | Whirlpool MH1140XMS Microwave Oven

1 Answer

Whirlpool gh7155xhs troubleshoot


Unless there is moisture or grease on the control circuit board, it's likely failing membrane keypad.
There is a video here showing how to remove a typical over the range control panel assembly in under 5 minutes.
For model GH7155XHS0, the exploded view and parts list are here:

http://shared.whirlpoolcorp.com/assets/pdfs/literature/Repair%20Part%20List%20-%20885939.pdf

The part number is 8171854 "Controller Sub Asy".

For model GH7155XHS1, the exploded view and parts list are here:

http://shared.whirlpoolcorp.com/assets/pdfs/literature/Repair%20Part%20List%20-%208183934.pdf

The part number is 8183977 "Controller Sub Asy"

You can order the parts from the Pros here.
Some connectors may have a lock.
5_4_2013_10_26_18_pm.jpg
Then carefully (since the display is made of glass) move your circuit board to the new frame, and reassembly is the reverse of disassembly.

Apr 27, 2013 | Microwave Ovens

1 Answer

I AM GETTING ELECTRICITY TO THE 220 PLUG AND THROUGH THE 220 PLUG WIRE TO THE STOVE JUNCTION BOX. THE STOVE TOP AND OVEN HEATING ELEMENTS ARE NOT HEATING UP BUT THE INDICATOR LIGHTS FOR BOTH ELEMENTS SHOW...


The indicator lights operate on 120 volts whereas the elements operate on 220 volts.
Using an electrical test meter go between the two hot legs and see if you are getting 220 volts. If not you have an open or non completed circuit.
Do not test from one leg to ground as you will probably read 120 volts for each leg. By reading across both legs you should get 220 volts.

May 03, 2011 | Microwave Ovens

1 Answer

Machine will not turn on


from online Microwave Repair Manual: Totally dead oven (no lights, no clock, no display, no fan, no heat...)First, check power to the outlet using a lamp or radio you know works. The fuse or circuit breaker at your service panel may have blown/tripped due to an overload or fault in the microwave oven or some other appliance. You may just have too many appliances plugged into this circuit - microwave ovens are high current appliances and should be on a dedicated circuit if possible. If you attempt to run a heating appliance like a toaster or fryer at the same time, you *will* blow the fuse or trip the circuit breaker. A refrigerator should never be plugged into the same circuit for this reason as well - you really don't want it to be without power because of your popcorn!

If you find the fuse blown or circuit breaker tripped, unplug everything from the circuit to which the microwave is connected (keep in mind that other outlets may be fed from the same circuit). Replace the fuse or reset the circuit breaker. If the same thing happens again, you have a problem with the outlet or other wiring on the same branch circuit. If plugging in the microwave causes the fuse to blow or circuit breaker to trip immediately, there is a short circuit in the power cord or elsewhere.

The microwave oven may be powered from a GFCI outlet or downstream of one and the GFCI may have tripped. (Removing a broken oven lamp has been known to happen.) The GFCI outlet may not be in an obvious location but first check the countertop outlets. The tripped GFCI could be in the garage or almost anywhere else! Pushing the RESET button may be all that's needed.

Next, try to set the clock. With some ovens the screen will be totally blank following a power outage - there may be nothing wrong with it. Furthermore, some ovens will not allow you perform any cooking related actions until the clock is set to a valid time.

Assuming these are not your problems, a fuse has probably blown although a dead controller is a possibility.


While you can do some repairs on your microwave, what you don't know can kill you... even on an unplugged microwave, so make sure you understand the dangers and how to reduce them before you try anything inside a microwave. If you want to do more yourself, go to the link at the top of this post.

Oct 21, 2010 | Microwave Ovens

2 Answers

Microwave fuse blowing???


You really need to check that circuit for ground and neutral faults before using it again.

Aug 29, 2009 | Panasonic NN-H275 Microwave Oven

1 Answer

GFCI Trips After an Hour


It is possible that the extention cord is the problem. Over time wires will heat voltage will drop. Along with the added distance on the code the voltage drop cause a drain and trips the GFCI. Try replacing GFCI and also try opperating without the extension cord.

Jun 12, 2009 | Panasonic NN-H764 Microwave Oven

1 Answer

Microwave causes GFCI on another circuit to trip


You may have a shorted High voltage component. Possibly a recttifier,aka, diode. This should only be replaced by an experienced repairman as an extremely high voltage shock potential exists.

May 27, 2008 | Panasonic NN-H764 Microwave Oven

1 Answer

Our Engineering Compamy Here In CANADA Montreal Quebec, Is Recommending To Use A 20Amp 2P-120V GFCI Breaker To Split A 15/20---120V Receptacle?? I Heard From Siemens Canada, That We Can Connect The Split...


First of all, is this to power a microwave?

If so, it is always recommended that microwave be on it's own breaker with nothing else attached to that breaker. This is due to the typically high current draw (12+ amps) of the oven.

The most important items which should be on a ground fault interrupter are those which may fall into water or get wet, but it's of course never a bad idea to use a GFI.

If this doesn't answer your question, please rephrase it with some more details.

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

Mar 17, 2008 | Microwave Ovens

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