Lighting is tripping GFCI...help!

[duncangweller]

Hi All,

I have recently changed the order in which the lights turn on using my apex controller on my 6 bulb t5 tek light fixture.

It used to be:

2 bulbs>2 bulbs off and 4 on>all 6 on.

I have now changed it to:

4 bulbs on> 6 bulbs on > 2 off down to 4 bulbs again.

Now, all switches over fine until it tries to go from 6 bulbs in the eve down to four. When the two bulbs go off, it trips my GFCI and everything shuts down.

Even if I turn the bulbs off manually at any time going from 6 to 4 it trips the GFCI.

It never did it on my previous schedule and now I'm really stumped as to what's happening. The last thing I want is for it to happen when I go to work and have no flow or heat all evening.

Hope someone can help.
Thanks,
Dunc