Question about Heating & Cooling
Installed a new thermastat and heat will not turn on. A/C is working fine. Orange wire is not connected to anything and Blue in connected to O/B
This is a heat pump right? You have the blue connected to o/b, I assume you have a yellow wire connected to y or cool. The thermostat may need a jumper wire from RC to RH on the thermostat. This gives 24v to the heat system to work. If you have this already, then the orange wire is most commonly connected to the reversing valve. On the wiring directions that came with the thermostat what does it have common assigned to (if any)? And you need to know that the reversing valve is energized in cool or heat mode. the wiring diagram will tell you this.
Posted on Dec 18, 2007
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Posted on Jan 02, 2017
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