Mod - Installed Honeywell digital thermostat - Need help

wyleyrabbit

Well-known member
Mod - Installed Honeywell digital thermostat - Need help - Solved!

Hi everyone,

I purchased a Honeywell RTH6400 thermostat from HD a couple of days ago and installed it as closely as I could to the instructions. Initially, the way I wired it up didn't start the furnace fan but I found a setting in the menu that allowed the thermostat to control the furnace and fan independently and that seemed to work.

Unfortunately, the unit doesn't play well with the air conditioner. It's probably just the way I have it wired up which may be the cause of my grief. Currently if the system is on "cool" then the AC works as expected. If the system is on "heat" then when it turns the furnace on, it also turns on the AC...not so good.

Has anyone wired one of these up? If so, what wires went where?

Thanks,
Chris
 
Last edited:

wyleyrabbit

Well-known member
Thanks! The thermostat seems to be working fine now. ;)

Now that it's working, I have to say, I LOVE this thermostat! It's programmable, so "magically" warms up the trailer before we wake up. Now Jody and I don't have to play rock-paper-scissors to decide who has to get up first. :angel:

Cheers,
Chris
 
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