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Brian HVAC Guy
Brian HVAC Guy, HVAC Technician
Category: HVAC
Satisfied Customers: 953
Experience:  I have been an HVAC/R mechanic/technician for 30+ years.
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Installed a new 5 day and 2 day programmable thermostate in

Customer Question

Installed a new 5 day and 2 day programmable thermostate in the winter and furnace worked good. Went to put air-conditioning on and it does not work. Is there something we need to program to get the air on?
Submitted: 2 years ago.
Category: HVAC
Expert:  Brian HVAC Guy replied 2 years ago.

Hi, I'm Brian. I'm here to help!

The most common cause for this is not ensuring there is a jumper on the thermostat between R (or Rh) and Rc. The two R terminals MUST be jumpered together where you connected the red wire. You can confirm if this is the problem by setting the thermostat fan switch to ON (instead of Auto). If the fan doesn't run in with the thermostat fan switch in ON then chances are you need to jumper as stated above.

Other than that, I would need the make and model of the thermostat, furnace and outdoor unit and we would need to check all wiring and programming. It's also possible you have a problem with the outdoor unit if the blower runs but the outdoor unit doesn't.