GFCI at shore power tripping

[drummer2020]

Hello Everyone. Brand new to this. Hopefully someone can help me out. I have a 2021 Amerilite 199DD travel trailer. I inadvertently drained the hot water tank for winterizing and thought I had the switch off but I did not. The element failed of course. The GFCI on the shore power tripped to alert me. I went ahead and installed a new element, but alas, the GFCI tripped again after a few hours. I went ahead replaced the converter thinking that that may have been damaged in the element failure but still, the GFCI tripped. At this point, I isolated it down to the "GEN" circuit. When this one is in the "off" position, the GFCI at the shore is not tripping. I have a 30 amp to 15 amp plug adapter for the power source and have been using this for the last 3 months with no issue until the element failure, for information sake. If someone has some words of wisdom that would be super. Thanks!!

[enblethen]

Bad adapter could also cause issues. Neutral damaged?

[CA_Traveler]

Understood but don't discount changing conditions. Turn off all CBs except the one for the Gen circuit. Do you still have the problem?

GFCI tripping can be difficult to isolate. A ground fault from the hot line to ground is one and turning off CBs can help to isolate that type.

GFCIs can also detect on a turned off circuit a potential leak from neutral to ground. Isolation of this fault involves disconnecting the circuits neutral wire.

Refers involve moisture and are another possible source.

[enblethen]

You do not have a 220 adapter or at least you better not have!
If your rig is equipped with a fifty amp four prong cord, you rig is 120/240.
If you have a 30 amp three prong cord it is 120 volts.
First, your water heater element burnt and went to ground. Disconnect all the 120 volt wires going to the water heater. it is possible more then the element was damaged.
Verify that the shore power cord has no continuity between the neutral pin and the ground pin.

[Dick_B]

Can you plug into another post as a test or is the campground full?

[drummer2020]

Thanks for the reply! You have a good point there but the connections at the adapter and at the plug in source are out of the way of moisture. It has rained a bunch here the last couple months and haven't had an issue previous to the water heater element failure.

[CA_Traveler]

Wondering if the current problem could be related to the rain in the area vs the repaired HW. Moisture is a common cause of a tripped GFCI. Is the 20/50 adapter exposed to the weather as one possible source? Outside plugs are susceptible to moisture. Moisture can be almost anywhere.