Broan combo Light/Vent Fan/Nite light fixture. Wired to Levitron combo three wall switch. Seems to work fine until the attic temperature exceeds 130 degrees (summer in Arizona!) Then both light and fan come on when either switch is opened. Night lite switch does not seem to be affected. When temperature drops below 115 in the attic, the switches operate correctly. We've doublechecked the wiring over and over. Can't find the problem. Could it be the fixture?
There's probably a thermal switch in the fixture which turns the fan on when the lights are on for a period of time and heat accumulates in the fixture. It sound like the heat from the attic is setting off the thermal switch. When the attic heat drops, the fixture works correctly.
This is a catch 22 situation, because if the upper housing in the attic is insulated from the attic heat, the insulation will prevent heat dissipation from the heat generated by the fixture's light bulbs. So, for safety reasons, the upper housing should not be insulated.
I'll need to work on this to come up with a fix.
Leviton triple switch
Nutone P66V616 views
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