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HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 14875
Experience:  15yrs in the HVAC industry with certificates and degrees.
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My thermostat won't turn the A/C on. What do I do?

Customer Question

My thermostat won't turn the A/C on. What do I do?
Submitted: 2 years ago.
Category: HVAC
Expert:  HVAC Guru replied 2 years ago.

Does the fan come on when selecting FAN ON?

Customer: replied 2 years ago.
No, it doesn't
Expert:  HVAC Guru replied 2 years ago.

OK then you either have bad batteries in the thermostat or the fuse has blown in the control board inside the furnace. If you do not have a battery controlled thermostat you need to check the fuse on the board in the furnace or air handler depending on where you live.

Customer: replied 2 years ago.
I did change the batteries in the thermostat. How would I know if its the fuse?
Expert:  HVAC Guru replied 2 years ago.

You may have a bad thermostat, can you get at the wires to the thermostat? If so connect the RED(RH) wire to the Green(G) wire and see if the blower fan comes on...if so the thermostat is bad.

Customer: replied 2 years ago.
Nothing happened.
Expert:  HVAC Guru replied 2 years ago.

Ok if nothing happened you need to check the fuse in the furnace on the board. You will look for this in your furnace or airhandler...check the fuse on the board to see if it is blown. That will cause this issue.

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Customer: replied 2 years ago.
does that mean there's nothing I can do myself?
Expert:  HVAC Guru replied 2 years ago.

Yes just open the panels on the furnace and get to the board it is where all the wires are connected to you can find it, you can remove the slot fuse yourself...it is just a 3 amp fuse remove it and check it.

Customer: replied 2 years ago.
I'm having trouble removing the slot fuse
Expert:  HVAC Guru replied 2 years ago.

It just pulls out, it may be just tight grab it with a needlenose pliers and pull it straight out.