[Johnasb]

I have a sump pump in the backyard that was replaced 6 months ago.
I had it wired through a GFI and it worked fine until now.
Now it trips the GFI after 20 seconds. Then will only reset for a couple seconds unless I wait a half hour to reset it. Then I can get another 20 seconds.
Anyway, the manufacturer is saying that it should not be on a GFI so they won't replace the pump.

Is this typical that it should not be on a GFI? Does the fact that it does trip the GFI indicate that there is a problem with the pump? Should that be a warranted problem? If I wire it without a GFI will it trip the breaker when there is a risk of electrical shock around the concrete sump basin? If not, is there some other way to auto-detect this hazard?

[ballengerb1]

Try it without the GFI, bet it works. GFI is not used for sump pumps and it appears that's what the manufacturer is saying too. The breaker will protect a short but not a ground fault. Your concern is probably higher than needed and it should be just fine on a good three prong receptacle.

[iamgrowler]

I have a sump pump in the backyard that was replaced 6 months ago.
I had it wired thru a GFI and it worked fine until now.
Now it trips the GFI after 20 seconds. Then will only reset for a couple seconds unless I wait a half hour to reset it. Then i can get another 20 seconds.
Anyway, the manufacturer is saying that it should not be on a GFI so they won't replace the pump.

Is this typical that it should not be on a GFI? Does the fact that it does trip the GFI indicate that there is a problem with the pump? Should that be a warranted problem? If I wire it without a GFI will it trip the breaker when there is a risk of electrical shock around the concrete sump basin? If not, is there some other way to auto-detect this hazard?

A 30 amp dedicated breaker located in the service panel should be sufficient for your needs.

A GFI is just asking for trouble, usually pump failure when you need the pump the most.