[rabbit-in-dallas]

Greetings:

Replaced a thremostat - it had died but the outside cooling unit stopped working last year. My question is: The thermostat has three wires going out to the outside unit. The old thermostat had two wires wired together - a red one and a green one. The green may not have originally been green as its very old wire. Anyway. The new thermostat said to split the two wires so I did. On the outside unit there is just two blue wires - one has the white wire from the thermostat tied to it and the other blue has the green tied to it and the red is loose. Do I need to connect the red to the green wire on the outside unit so the compressor will run? Since it had no tape or cap on it - I wonder if it did not just come loose from the green wire? Please just email your answer to [email protected]

Thanks for your help.

Robert

[hvac1000]

Check for 24 volts on the wires at the outside unit when the thermostat is calling for cooling. Those are the two wires you want to use.