OK, this is driving me crazy. I'm hoping folks can get past my poor descriptions here and maybe offer some advice.
I was hoping to add a new Honeywell wifi thermostat which of course requires the common c wire for power. My house had ancient two wire thermostat control but did have a newish Honeywell thermostat existing. The furnace had a Honeywell unit with a blank hookup for c, so I decided to just run new 18-3 wire and hookup the red, white, and c to power the new thermostat.
Trouble is, the thermostat won't power on. I've done the following to troubleshoot:
1. I verified that I'm getting 26 VAC between red and c and about 23 VAC between red and white, at the screws of the thermostat base.
2. I switched back to the old thermostat. Everything works fine with the batteries in, but doesn't power on with the batteries out.
So...it's acting like it's getting no power from the c wire, but the voltmeter is showing about 24 volts there. I Haven't dealt with these much, and I'm not really sure what to check next.
Any advice? Thanks very much!
Travis
I was hoping to add a new Honeywell wifi thermostat which of course requires the common c wire for power. My house had ancient two wire thermostat control but did have a newish Honeywell thermostat existing. The furnace had a Honeywell unit with a blank hookup for c, so I decided to just run new 18-3 wire and hookup the red, white, and c to power the new thermostat.
Trouble is, the thermostat won't power on. I've done the following to troubleshoot:
1. I verified that I'm getting 26 VAC between red and c and about 23 VAC between red and white, at the screws of the thermostat base.
2. I switched back to the old thermostat. Everything works fine with the batteries in, but doesn't power on with the batteries out.
So...it's acting like it's getting no power from the c wire, but the voltmeter is showing about 24 volts there. I Haven't dealt with these much, and I'm not really sure what to check next.
Any advice? Thanks very much!
Travis