I currently have a Honeywell TH5220D1003 thermostat in my new construction home. I have dual-zone heating and air (one for upstairs and one for downstairs). There are 5 wires hooked up to the downstairs panel in this order:
Red = Rc
(built in jumper from Rc to R)
Yellow = Y
Blue = C
White = W
Green = G
I recently purchased a Honeywell RTH6300B1005. The entire assembly looks exactly the same. The new Honeywell has less pins/connections, however my setup doesn't actually even have wires connected to those extra pins. The new thermostat would fit perfectly on the old assembly and wires matched exactly. The only difference is that on the new one where the Blue (C) wire would go, it's labeled as unused on the wire harness. The old thermostat labels it as "C is optional with batteries".
I wired it up and didn't hook up the blue wire to the new one. I plugged it all in and turned on the circuit breaker and nothing happened. The new thermostat wouldn't turn on. I then plugged the Blue wire in to the spot that says "unused" where it was plugged in to on the old one and still nothing. However I am able to take the old thermostat and put it on the new ones assembly and it turns on perfectly fine. These are both newer thermostats, both are Honeywell, and as I mentioned appear to have the exact same wire harnesses with the exception of some extra unused pins.
Any help would be appreciated. Thanks!
Red = Rc
(built in jumper from Rc to R)
Yellow = Y
Blue = C
White = W
Green = G
I recently purchased a Honeywell RTH6300B1005. The entire assembly looks exactly the same. The new Honeywell has less pins/connections, however my setup doesn't actually even have wires connected to those extra pins. The new thermostat would fit perfectly on the old assembly and wires matched exactly. The only difference is that on the new one where the Blue (C) wire would go, it's labeled as unused on the wire harness. The old thermostat labels it as "C is optional with batteries".
I wired it up and didn't hook up the blue wire to the new one. I plugged it all in and turned on the circuit breaker and nothing happened. The new thermostat wouldn't turn on. I then plugged the Blue wire in to the spot that says "unused" where it was plugged in to on the old one and still nothing. However I am able to take the old thermostat and put it on the new ones assembly and it turns on perfectly fine. These are both newer thermostats, both are Honeywell, and as I mentioned appear to have the exact same wire harnesses with the exception of some extra unused pins.
Any help would be appreciated. Thanks!