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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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The Ac isn't blowing cold air. When I try to turn it off at

Customer Question

The Ac isn't blowing cold air. When I try to turn it off at thermostat, it won't turn off unless I turn it off at the breaker. And the fan on the outside unit isn't turning
Submitted: 1 year ago.
Category: HVAC
Expert:  Tim H. replied 1 year ago.

Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need. Please be patient as many times we work with several customers at once.

So you say outside unit is not running AT ALL, but inside unit won't shut off, correct?

Customer: replied 1 year ago.
Expert:  Tim H. replied 1 year ago.

Sounds like a bad thermostat. Have you tried a different one?

Customer: replied 1 year ago.
No. I was thinking it might be a bad contractor on the outside unit
Expert:  Tim H. replied 1 year ago.

That would not let inside unit keep running, however.

Customer: replied 1 year ago.
Would a bad thermostat keep the outside unit from coming on though?
Expert:  Tim H. replied 1 year ago.

It would, yes. It would also allow inside unit to stay on.

Expert:  Tim H. replied 1 year ago.

To bypass the thermostat, turn furnace or air handler power off, take the front section of the thermostat off

the wall, loose from the back section (called subbase). You will see the thermostat wiring. Take the red wire

on R or RC-RH, yellow or blue wire on Y, and green wire on G and twist the ends of these together. Then power

back on. See if A/C now runs.

Expert:  Tim H. replied 1 year ago.

Did you need additional help?

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