Is there any way to test a breaker?

68gtxman said

Yeah, my advice above was for this. I assumed it was already wired that way. But if it is already wired for 120, the high magnetic breaker may be all that's need to fix it. But the higher voltage way is the way to go if he already has enough wires run to the outlet box to support it.

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Let's assume he has 12/2 with ground wire for a 20 amp breaker.
I think he doesn't know. But it should be that IIR.
(Even so if someone went cheep and ran 14/2 swapping to 230 would definitely be the way to go.)
So if he uses that 12/2 wire and puts in a 230 it's a win win.
Or maybe even a win win win.
I'm posting for his benefit.
I know you know.