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Old 09-12-2019, 11:38 AM   #1
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Check microwave outlet!

My microwave oven started powering off then back on again when i know there was no shore power loss.

So i looked at the outlet way back in the cabinet and found the outlet had overheated and blackened near the plugins see pic.

I replaced the outlet with a new one which was easy but i do not like the design of the rv snap together outlets. There is not enough force and contact from the plug to the outlet and this creates resistance and heat during high loads like a microwave which can draw 15 amps or more.

Just a suggestion to check yours even if all seems well before a possible fire hazard exists.
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Old 09-12-2019, 01:11 PM   #2
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It can only draw more than 15A @ 120VAC if someone installed a 20A or larger breaker. Now if one experiences low voltage, amp-draw increases;however a 15A breaker should still trip-out.
Your first picture plainly shows both receptacle plug-ins are melted, which means there were 2 appliances plugged into that receptacle.
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Old 09-12-2019, 01:35 PM   #3
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Just one, i moved the MW from one to the other it melted both.
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Old 09-12-2019, 01:38 PM   #4
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With the metal discoloration and warpage, I'll bet it glowed pretty - pretty scary!
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Old 09-12-2019, 02:36 PM   #5
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Probably so ! Im glad it acted up again on the other plug before it caught fire. I installed an outlet with much better contacts im sure will hold up.
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Old 09-13-2019, 02:14 PM   #6
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Probably so ! Im glad it acted up again on the other plug before it caught fire. I installed an outlet with much better contacts im sure will hold up.
It probably doesn't help that the cord is plugged in all the time bouncing around when driving down the highway. I had a similar issue with the 110V. power cord on my refrigerator which plugged into a receptacle inside the outside fridge vent. The receptacle was worn so the plug contacts didn't have a good connection. I replaced the receptacle and secured the cord so it can't move.
Now I'm going to check my Microwave cord. If I can unplug it I will. We have never used the Microwave since we've had our MH anyway.
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Old 09-14-2019, 03:29 PM   #7
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As a follow up, my fairly new Kitchenaid MW (model number in pic) draws the same amps as my roof air approximately 14amps AC / 150amps 12vdc. My 5000 watt pure sine inverter runs it easily. And it has a 20amp breaker I assume from factory. IMHO the factory outlets at least the 1998 ones are not sufficient to handle that much current over some period of time. It melted the second outlet in less than 6 months time after i moved it.
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Old 09-14-2019, 06:56 PM   #8
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It looks like your new/replacement microwave oven has a higher wattage than the older unit it replaced. A good lesson for anyone replacing a MW. Even though you have a 20A breaker I would not assume it's original unless the wiring is at least 12AWG. A melted outlet is a symptom of a real problem and continuing to use it is foolhardy.
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Old 09-14-2019, 08:05 PM   #9
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It looks like your new/replacement microwave oven has a higher wattage than the older unit it replaced. A good lesson for anyone replacing a MW. Even though you have a 20A breaker I would not assume it's original unless the wiring is at least 12AWG. A melted outlet is a symptom of a real problem and continuing to use it is foolhardy.

Thanks just to be clear, the wiring is 12 gauge and i installed a new outlet that will handle the power. Ive wired complete houses including mine and i know what is safe.
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Old 09-14-2019, 08:08 PM   #10
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And the old MW melted 1of the 2 plugs on the original outlet which is a bad design IMHO...
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Old 09-14-2019, 08:13 PM   #11
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My original intent of this thread was to hopefully share knowledge to keep this same issue from burning down someones rig not to be called foolhardy. Maybe ill just start sharing much less info here.
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Old 09-14-2019, 09:37 PM   #12
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Cheap residential 15amp outlets have a reputation for poor contact design. As mentioned, bouncing down the road doesn't help. I believe your conclusions are correct.

One additional thought. The manual for your model appears to indicate it also has a convection mode. When I use my microwave in convection mode, the adjacent cabinets get a lot hotter than I like. Your models installation instructions also show the outlet in the cabinet right above the microwave. The microwaves 14 amp draw was right at the limit of the 15 amp outlet. If I recall correctly, for all circuits less than 100 amps, equipment ampacities are only valid to 60C (140F). While I think your conclusion that that cheap outlet was the source of the problem is correct, if that upper cabinet is really heating up, I would have put in a 20 amp outlet. Maybe you did, but just did not say so.
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Old 09-15-2019, 11:08 AM   #13
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My point was. Why would the manufacturer install a 20 amp circuit with a 15 amp duplex outlet? They would be sued out of business for the negligence. Someone either installed a bigger higher wattage MW and circuit beaker. Yours is the only one I've heard or seen this happen to. So your warning I assume is for everyone who buys a used motorhome are to check all the wiring and circuits where an owner modification was done incorrectly and I thank you for that.
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