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re: HVAC/Changing Thermostat…help? UPDATE: SUCCESS!
Posted on 3/8/24 at 1:24 pm to Schmelly
Posted on 3/8/24 at 1:24 pm to Schmelly
The common wire wasn't used by the old thermostat. It's probably not connected to the control board on the other end, thus no power. Have you checked it with a multimeter?
6
Posted on 3/8/24 at 1:35 pm to TAMU-93
quote:
The common wire wasn't used by the old thermostat. It's probably not connected to the control board on the other end, thus no power. Have you checked it with a multimeter?
Nope. Figured that’s what the deal was when nothing was happening. Thanks
Posted on 3/8/24 at 2:20 pm to TAMU-93
quote:
The common wire wasn't used by the old thermostat. It's probably not connected to the control board on the other end, thus no power. Have you checked it with a multimeter?
Thats my bet, nobody would leave an energized wire just sitting around in a box without a wire nut or something, even if its just low voltage.
Posted on 3/8/24 at 3:00 pm to TAMU-93
quote:This would be my bet.
The common wire wasn't used by the old thermostat. It's probably not connected to the control board on the other end, thus no power.
Posted on 3/8/24 at 4:34 pm to TAMU-93
quote:
The common wire wasn't used by the old thermostat. It's probably not connected to the control board on the other end, thus no power. Have you checked it with a multimeter?
This would be my guess - when I upgraded to a smart thermostat - I needed to connect the blue (common) wire to the control/circuit board in the furnace. It would not be connected if the blue common wire wasn’t used/connected with your old thermostat.
Posted on 3/8/24 at 4:35 pm to TAMU-93
delete - double post.
This post was edited on 3/8/24 at 4:38 pm
Posted on 3/8/24 at 4:37 pm to TAMU-93
Found the blue wire!
Is this where I’m plugging in? Only available spot is on the left
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