I have a 1999 MAAX Spa.

Infinity series. Model: Vesuvius LS2

Serial #: 99134893

The spa is hooked up to a 60 amp 240 volt main breaker in the main panel out to a 50 amp 240 volt GFI in a control box with in sight of the spa.

According to the owners manual and the identification plate in the spa it draws: 240 VAC, 60HZ, 32 AMP.

It has been running since October '06 without any problems until 3 days ago.

Now the GFI breaker trips every 2 hours.

It works fine with the heater & circulation pump on or with the 2 main pumps on but when it goes into the Purge Cycle/Smart Winter Mode it trips the GFI when the 1 minute cycle is over.

I even disconnected pump #1 to see if it was a load problem but it still trips the GFI when the Purge Cycle ends.

The GFI was new when installed in October and as I mentioned before it won't trip with the heater/circulation pump on or when the 2 main pumps are on.

Suggestions?