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Category: HVAC
Satisfied Customers: 15120
Experience:  15yrs in the HVAC industry with certificates and degrees.
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I put the new thermostat in and the only way the air will

Customer Question

I put the new thermostat in and the only way the air will run is if I put the blue wire to the red terminal. The blue wire is on the y terminal on the furnace control board with the red wire from the air conditioner.
Submitted: 1 year ago.
Category: HVAC
Expert:  HVAC Guru replied 1 year ago.

Hello and thanks for using this service, if you have been waiting do not worry or get upset. I am HVAC Guru an extremely experienced tech on the site and I try to get to as many customers as I can. I just picked up your question now. NOTE it takes time for me to type research and add links so please wait for me to respond back I can only do this so fast. Secondly I am not paid anything until you rate my service good using the STAR RATING LINK at the top of your page, the money is paid to the site not me directly.


If it runs with them jumped the thermostat is defective, batteries are low in the thermostat or the connection at the thermostat is bad. You may just need a new thermostat.

All I ask is please use the Star Rating Link at the top of your page before leaving, that is the only way I am paid anything through the are greatly appreciated so thank you very much for using this service. If you have any other questions just post back to me here anytime!

Customer: replied 1 year ago.

this is a new thermostat

Expert:  HVAC Guru replied 1 year ago.

What brand is it, you must have a defective one or possibly it is not set right

Customer: replied 1 year ago.

The new thermostat is a Honeywell. I have tried 2 of them. The old thermostat was a White Rogers and the furnace is an Amana

Expert:  HVAC Guru replied 1 year ago.

If you put the wires together and the unit works fine the thermostat just does that same thing do you have a battery powered unit or one connect to a C wire?