reno ) said...

The third pump circuit (220vac) is on a timer and which controls the
pump and an ionizer (120 vac). The ionizer and the circulation pump
should be running simultaneously. The the ionizer is plugged into an
outlet which gets its power from one of the hot leads (120), coming the
timer that also goes to the pump. The neutral to the 120 ioinizer
outlet is from another circuit in the box.

That last sentence is the key to the problem.

Any load current that flows through the GFCI in any way must return through
it as well. If the outlet is powered by a hot that comes from a GFCI, it
must use a neutral that goes back to that same GFCI, and not directly to
the neutral bus (or to a different GFCI).


By the way, generally speaking, code doesn't usually allow one two pole
breaker to supply both 120 volt loads and 240 volt loads as described.
Yes, in a clothes dryer and electric range, there tend to be both loads,
but supplying different devices where some are 120 and others are 240 is
generally frowned upon.

That said, exceptions are sometimes made. We have a cold storage room
that has a 3-wire feed from a two-pole breaker. 240 volts is needed for
a small (300 watt) baseboard heater that provides a tiny heat source
should the temperature in the winter drop below freezing. The room has
a light and one outlet, and each of these are powered off of opposite
hots on the feed. The inspector did not have a problem with this, probably
because of its light use -- the light probably draws more energy in a year
than anything else on that circuit.

--
Calvin Henry-Cotnam
"I really think Canada should get over to Iraq as quickly as possible"
- Paul Martin - April 30, 2003
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