Air Conditioning - New Thermostat....AC not working.

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View Full Version : New Thermostat....AC not working.

jdc75
05-24-07, 06:02 PM
Over the winter I installed a new digital thermostat. The furnace worked great all winter. I tried to turn on the AC today and it kicked on then imediatly shut off. I hear the compressor kick in then the thermostat clicks and the compressor shuts off. Any suggestions?

Jay11J
05-24-07, 09:53 PM
Both furnace fan and outdoor units shuts down after you turn it on?

What is the brand/model of the new t-stat?
jdc75
05-25-07, 02:26 PM
Yes, both furnace blower and outdoor fan and compressor shuts down right after I turn it on.

Furnace fan works fine if I just turn it on.

I also noticed that the AC unit has no outside breaker. It is wired directly to the indoor breaker box on a 40 amp breaker. When it shuts down it does not trip the breaker. I don't think this is up to code.

The new t-stat is a LUX TX1500 Wired as such:

Green Wire -- G
Blue Wire -- Y
White Wire -- W
Red Wire -- RH jumped to RC

Jay11J
05-26-07, 04:58 AM
Ok, for kicks at the t-stat set for cool and then go to the furnace control board where all the wires meet.

Remove the door, then remove the Y wire that goes outside. If the system starts off, then it could be a weak transfromer. If it still don't work, then remove the Y wire from the t-stat on the board.

Let us know what happens.

Do you have a meter?