No Power to Bedroom Thermostat

[kbbagshaw]

We have a 2015 Cyclone 3100 with 3 A/Cs. This trip out, the thermostat in the bedroom quit working. It's blank. I replaced the known working one from the living room with no luck. It seems all of a sudden, I've lost power to the thermostat. Looked at fuses in main fuse box. Suggestions?

 

[Bob&Patty]

Did the T stat from the BR work in the other location?? If you have a 12V test light or volt/ohm meter...test to see if have 12V power and ground at the wires.

 

[wdk450]

If this is wired like the main air conditioner, the wire from the AC unit is +12 volts to ground; the other wire to the thermostat should be ground. Shorting these wires together should cause the AC to come on. The thermostat actually switches ground, not power like in most circuits. The +12 volts actually goes through a relay coil before it goes to the thermostat.

BTW, is the AC circuit breaker for the rear Air Conditioner ON (not tripped)?

 

[Jim.Allison]

Take the cover off the AC unit and find a small J box, check to see if you have lost a wire nut, while you're in there tape up all wire nuts and secure all connections.

 

[Terry H]

Check for a blown fuse on the control board in a metal box under exterior AC cover.