Another good example of going down rat holes, trying to kludge crap together, when there is no need. It's code that basement receptacles have to be GFCI. There are millions of high eff furnaces. If condensate pumps were incompatible with GFCI, tripping them, there would be a huge problem. Apparently there isn't. The OP has a brand new pump, brand new GFCI. Something is either defective or wired incorrectly. The solution would seem to be to fix it, not kludge around it.
So, not only the condensate pump is on the GFCI, but the furnace too? Furnace does not have to be GFCI and I would not wire one into a GFCI.
Not clear here, maybe the condensate not pumping out triggered a sensor and that shut off the furnace/AC?
So what's wrong? Bad condensate pump? Bad GFCI?
OP,
does the GFI trip
1) very soon after the pump is plugged in even if it is not running?2) after a while when the pump is running
3) at the same time that the pump starts or stops.If 3, it may be the noise surge when the pump switches on or off.
I think they make another version of GFI that is for higher leakage. You might try to find one of those.
Also, I think code allows (or did in the past) an outlet to be mounted high up at the ceiling to not have a GFI. This is intended for sump pumps.
mark
I have a Little Giant on a GFCI receptacle. That receptacle is on the same circuit as the furnace. Ten years, no trips.
He could try plugging the pump into another GFCI. If it has to run to trip, could put it outside, run a garden hose very slow into it, let it run for awhile, see if it trips. It's not clear if the furnace is on the GFCI too, would be unusual, but if so, that could be what's tripping it, though it really should not if it's not defective.
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