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Old 03-21-2018, 01:56 PM   #21
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Brand: Thor Motor Coach
Model: Aria 3901
State: Idaho
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Originally Posted by CSR View Post
We had an electrician look at the issue. He was convinced the problem is due the modified sine wave inverter. Something about the square wave pattern causing subtle faults that cause most GCFI receptacles to trip. Our dealer swapped the receptacle, but the problem continues to persist. We plan to upgrade to a pure sine inverter and see if we get better results.
That is what solved the problem for us.
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Old 04-03-2018, 10:26 AM   #22
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We bought a 2018 Aria 3901 in March. Same GFI issue but also popping cb#9. RV dealer has no idea what is on that CB. He says Thor has no schematic for their RV. Need to call Thor. GFI follows same pattern of changing power sources. Will show RV service this thread. Also having transmission issues. Luckily, thatís just a broken connector.
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Old 04-03-2018, 11:36 AM   #23
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Hi all, I mentioned this on another Aria post. The new GFI's do not like a modified sine wave inverter. You can not "test" a GFI on a modified sine wave inverter. You only test when on another power source. The reason a new GFI wouldn't work is because they "self test".

You have two choices.

1 fight with Thor and get a pure sine wave inverter.

2 go on EBay or Amazon and get an older model GFI Leviton 8899 and install it and the problem also goes away.

I am so mad at Thor I don't ever want to talk to them, so I went with option #2. We have been full timing for three months without a single trip. We have been in 11 different campground and gone back and forth between all power sources a lot. The model 8899 was an easy fix so we could get on with life.

Scott (Chesuncook 1)
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Old 04-03-2018, 12:53 PM   #24
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Originally Posted by Chesuncook1 View Post
You can not "test" a GFI on a modified sine wave inverter. You only test when on another power source. The reason a new GFI wouldn't work is because they "self test".

SORRY to disagree, but our GFCI outlets work perfectly fine on our Magnum ME2012 inverter.... it has nothing to do with that, it's more than likely a faulty GFCI outlet, or loose wiring back at the breaker box.
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Old 04-03-2018, 03:55 PM   #25
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Thanks for your reply TurnerFam. I am just quoting what a Magnum tech told me on the phone. I had tried numerous new GFI's with the same results. As soon as I changed the GFI to a model the tech told me to, my problem was solved. I never check any other wiring. For me anyway the older non self testing GFI fixed the problem. Maybe your coach doesn't have a self testing GFI and that's why it works.
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Old 04-03-2018, 06:52 PM   #26
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if by self testing, you mean a red button that reads 'test', then yes, works fine.
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Old 04-03-2018, 07:32 PM   #27
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No, not the red button. Whenever you take power away and then re-energize a new GFI, it goes through a self test which won't work on a modified sine wave inverter. While you are providing power with the inverter, try and push the red test button and then try to reset. Supposedly, that is what you can't do with a modified sine wave inverter. Again, tjis is from Magnum tech not me.
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Old 04-03-2018, 08:31 PM   #28
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mine's always worked fine, the test button function just like it should, reset sets it back to working.... though, no, no GFCI's will 'test' without power, of course.

apparently some of the new 'automatic' self testing units are too sensitive and don't like certain types of power - I'm also not sure why a 'self testing' unit makes any more sense than the typical GFCI unit - they are all problematic at times, and seem to be overly sensitive. If small children are present, I can understand more reasons for them.
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Old 04-14-2018, 09:25 PM   #29
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Model: Aria 3401
State: New York
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We had the very same gfi problem with our new Aria 3401. It worked fine on 50 amp shore power but kept tripping with anything else. For us this was very serious as the bathroom gfi controls a number of other outlets including the one on the underside of the kitchen over-counter cabinets, where we plug in the coffee maker. I took the suggestion of swapping out the bathroom gfi with a Leviton 8899 (got mine on Amazon for under $20) and that did the trick. With my old fat fingers and very short wires, it was not an easy install but not too bad either.
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Old 05-14-2018, 12:48 AM   #30
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Thank you for your post m1noel. I also own an Aria 3901 with the same GFI tripping problem. Hopefully, this information will come in handy.
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