Thermostat question...

[Rob_in_WV]

Thats not how I've seen it work. If the system uses a contactor the fan will not energize. Thats why you set the stat to electic when using contactors. There might be exceptions to this but I haven't seen them.

I know what you're saying, thats why I always confirm how its configured as I've seen it done with a contactor that didn't require the fan relay NO contacts to close to operate the blower.

Mgenius I might be wrong, but thats why I'm here to share ideas and share what I do know. (which at times seem like little compared to some here) I appreciate the response.

[mgenius33]

This is a great site, I usually learn something new, or find a good research subject every time I log on.

[garyed]

If you're lazy like me just jump the R + W & see if the fan comes on with the heat. If it does set it to "gas" it it doesn't set it to "electric". I ain't crawling in the attic or under a house if I don't have to.

[knave]

If you select "electric heat" on a dual fuel heat pump system, things could get interesting...