I am trying to determine if I can install a new honeywell wifi thermostat in place of my current unit. My furnace is quite old, and from what I can tell, the wiring of the thermostat does not match the wiring of the furnace control panel. I was hoping to use the G wire in place of C, but there are wires already attached to the C terminal (labeled B on this furnace control). However, no wires connected to C on the thermostat panel and there are no extras in the wall. In addition, there are multiple red wires on the furnace panel and some terminals that have multiple wires connected to them. I have included pictures below, any help/clarification would be greatly appreciated.
Last edited by PJmax; 10-20-21 at 10:48 AM.
Reason: resized/labeled pic
Thank you! The new thermostat model # is Honeywell RTH6580WF. Just to confirm, once I do the wire transfers you are suggesting on the furnace board I will have white, red, and green wires on the B/C terminal?
I finally got around to installing this, and unfortunately repressing the G wire didn't work. I've double and triple checked the terminal connections and wiring diagram for the new thermostat (furnace picture attached), is there something I've done wrong?
That wiring looks correct leaving these connections.
At the thermostat.......
red = R (depending on stat..... switch to single R wire or add jumper between R terminals.)
blue = Y
white = W
green = C
I have a Goodman furnace that has decided to stop working on me. A few weeks ago it also stopped working, but I was able to fix it by adjusting some connections, but this time I can't get it working.
When I turn it on, the blower and induction motor kick on, LED on the control board lights, then shuts off and starts blinking 6 times. Blower and everything stays on, but burners don't light and ignitor doesn't heat up.
The information inside the furnace door says 6 blinks is "rollout open", so I checked both rollout switches neither seemed to be flipped. Tried bypassing them as well but get the same error each time.
Have not gotten to check voltage everywhere yet because someone (me) left my multimeter turned on the last time and the battery died and I haven't replaced it yet. However, it seems like the thermostat is working fine and we have not installed anything new in months.
What else do I need to check and look at?
My furnace was working fine until yesterday, now it won't light. The ignitor wouldn't glow at all so I replaced it. Same problem, the ignitor won't come on. Any suggestions? Could it be the thermostat?
10-20-21, 10:17 AM
