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Our total line thermostat was set on 73 degrees and all of a sudden it went to 99 degrees and I counld not turn it off, it just kept running. So I turned off the breaker and turned in back on and now I can't set the temperature. It's just set on 99 and won't do anything. When I turn the fan on, the air won't get cold.

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Hi, it sounds as though you have a faulty thermostat that failed before your eyes. The circuitry in the sub-base has failed. If the stat is set in the off posistion and you turn the fan switch on, just the fan will run. If it is on cool and you turn the fan to on and not auto, it should bring on the compressor. You will need to get a new thermostat. Kill the breaker and remove the cover to the stat and expose the wiring. This is a 24 low voltage stat. It will have terminals rh and rc with a red jumper connecting the 2, and your red hot wire connected to either one.Y, yellow for cooling, G, green for fan control, and white , W for heat control. Y yellow may be using a blue wire instead. They sometimes do this. Write this down and pick up a stat at Home Depot, Lowe's hardware This will solve your problem. Please don't forget to rate me as I know you will be kind. I will check in on you as I keep files on all of problems I have solved to help people. You can also get back to me by my user name below.
Sincerely,
Shastalaker7
A/C, Heating Contractor

Posted on Sep 03, 2010

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