[Robert Coats]

Bought a used LG dryer (electric) and tried it for the first time today. As soon as I plugged in the big 4-prong plug, the twin 30A GFCI breaker trips. Tried a reset, and it instantly trips again. Will only reset if plug removed from dryer 220V outlet.

Dryer had a 3-prong plug when I bought it, and updated to a 4-prong, as that is what we have in the laundry room. Verified the black, white, red and green leads were all correctly attached to the dryer, as well as confirmed each had continuity from the ring connector to prong.

Also correctly measured 120V at each side of the outlet. I am sure the outlet, wires, breaker, etc. are all working and installed correctly.

From what I've read online so far, the dryer may have a failed heating coil, which could ground out. Significant effort required to disassemble the dryer for access to the coil, so what easier things might I check?

I've read some dryers don't like GFCI breakers/circuit, so for testing purposes, I'm tempted to replace that breaker with a non-GFCI style to see if that solves it. Again, a bit easier than exploratory surgery on the dryer.

Thanks in advance for the help.

FYI, I think code requires all 240V circuits to use GFCI breakers, as we had a totally new panel installed after our fire last year.