Question about Panasonic NN-H764 Microwave Oven
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.
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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Posted on Jan 02, 2017
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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.
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