For A C Thermostat Wire Diagram. Usually c wire or the common wire will be a blue coloured wire. For five wires g fan green r 24 vacrrc red c 24 vac common blue brown or purple are the most common y compressorair conditioner yellow w heat white.
Connect the g wire to the c terminal on the thermostat. See the diagram below for what each wire controls on your system. If you do not have a c.
If youre not sure whats wrong or dont feel comfortable fixing your system the best solution.
Control transformer wiring diagram 8 images coleman two wire thermostat wiring. A 24v c wire connection is required for all contemporary digital thermostats for hvac equipment to work. On the back plate you will see a number of letters. 5 wire honeywell thermostat wiring.