I have a Gibson Electric Central Air & Heat unit, the cold air is fine, but when I turn it to heat it won't stay on for more than a minute or so. It will click off and then on... off and then on and so on. It doesn't matter what the thermostat is set on. Any ideas on what could be the cause of this?
Thanks so much.

Exact model number?

Oops... sorries. The model number is GB3BV-024K-A

Only thing under G3B is a variable speed conversion

http://www.nordyne.com/literature/708215a.pdf

http://www.acdirect.com/grandaire_specs/GB3BMV_TS_780a.pdf

Unit

It could be a bad heat sequencer or relay. Check the back side of the blower access door for your exact wiring diagram.

Thanks a bunch!

No problem