I am trying to upgrade to a programmable thermostat. I bought the Honeywell RTH9580 with WiFi. I can get power to the new thermostat and get the fan running. However, it will not work when the fan is set to automatic, or get the AC or Heat going.
The furnace board has the following wires
- A jumper from Y to G
- White wire into W1, with jumper to W2
- Red wire to R
- Green wire to G
- Blue wire to C
I set up the Honeywell as follows:
- White wire to W1
- Red wire to Rc with jumper left in place to R
- Green wire to Y (and also tried G)
- Blue wire to C
Like I said the fan will run when set to run but not auto and neither AC nor Heat kicks in.
Best Answer
I would remove the jumper from Y to G and use your yellow for Y.
On the thermostat and the furnace you should have Y , yellow (cooling) G, green (fan) R, red (power 24v) jumper R to Rc, Rh W, white (heat) no jumper, on thermostat use W1 (first stage heat). Leave W2 unused and set the thermostat to single stage heat, single stage cool, that way the thermostat knows that there is nothing connected to its W2 terminal. C, blue (common/ground) this wire allows the thermostat to draw power from the HVAC system as opposed to using the batteries.