Old Thermostat Color coding


Old 04-23-19, 01:10 AM
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Old Thermostat Color coding

I tried changing the thermostat to a new one, but it was not compatible with my system.
I need help trying to reconnect the wires back the way they were.
The ac is still not working property.

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Last edited by PJmax; 04-23-19 at 02:08 AM. Reason: cropped/resized pictures
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Old 04-23-19, 02:03 AM
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You're supposed to take the picture of the wiring before changing it.
Added a thermostat wiring chart to your pictures.

Pretty sure you have a heat pump system there but we need more information. Since the B terminal is in use..... that would signify a Rheem/Ruud A/C system. Is that correct ?

Red on Rh and Rc
Brown on G
Yellow on Y (jumper required from Y to W)
Blue on B

On a replacement stat......
Red to Rh and Rc
Brown to G
Yellow to Y
Blue to O/B and set for B heat pump operation (if Rheem or Ruud)
Configure stat for heat pump operation with no backup electric heat.
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