Why is my cooling not working?

If your cooling is not working, it's probably due to issues with the following:

To begin fixing your cooling, continue to the Air Flow section.


Air Flow

C-Wire Go to your vents

1. What best describes the air coming out of your vents?


Compressor

C-Wire Go to your compressor

Compressors are large fans inside a box, usually found outside at the side of homes.

2. Is the compressor running?


Thermostat Wiring

C-Wire Go to your thermostat

3. Remove your existing thermostat from the wall plate

On most thermostats, you can take off the thermostat by grasping and gently pulling. Some thermostats may have screws, buttons, or clasps.

Note: Don't remove any wires from your thermostat at this time.

Thermostat


4. Look at the terminals that have connected wires. Do you have any of the following terminal configurations?

  • Rc, Y, G
  • Rc (connected to R), Y, G
  • Rc / R, Y, G, O / B

  • YES – You don't appear to have a wiring issue. Continue to the next step.
  • NO – Continue to the Thermostat Device section.


5. Make sure the wires are connected

Gently tug on the wires to make sure they are connected to the terminals.

C-Wire Go to your vents


6. Is your cooling working now?

  • YES – Congratulations! You've fixed your cooling! You are now complete.
  • NO – Continue to the Thermostat Device section.


Furnace or Heating System

C-Wire Go to your home's circuit breaker


7. Make sure the breaker to the furnace is turned on

C-Wire Go to your furnace or heating system

This system is often located in your basement, attic, or garage.


8. Make sure your furnace is turned on

There's usually a switch next to your furnace that turns it on or off. It sometimes looks like a light switch.


9. Make sure the furnace cover is closed.

Be sure the cover is completely closed. Some systems won't power up if the cover isn't fully closed.

furnace

C-Wire Go to your vents


10. What best describes the air coming out of your vents?


Thermostat Device

C-Wire Go to your thermostat

11. Does the thermostat show any of the following icons or messages?

  • "Wait" (flashing)
  • "Waiting for System (flashing)
  • "Cool On" (flashing)
  • Snowflake Icon (flashing)
  • Snowflake Icon with "Cooling will Begin" message

  • YES – Good, this is normal. Wait 3 to 5 minutes until the flashing stops and the icons or messages become solid. When that happens, continue to the next step.
  • NO – Make sure you have your thermostat set to cooling, and that your thermostat's set point is lower than the current temperature. Once you've confirmed this, continue to Step 13.


12. Does the thermostat show any of the following low-power icons or messages?

A Low-Battery icon or "I Don't Have Power…" message.

  • YES – You may have a power issue. If your thermostat is battery-powered, try replacing the batteries. If your thermostat is powered by a C-Wire, try checking that. Learn more about C-Wires (link to C-Wire Guide). Once you've confirmed your thermostat is being powered, continue to the next step.
  • NO – Good, this is normal. Continue to the next step.


13. Go to your vents

Is your cooling working now?

  • YES – Congratulations! You've fixed your cooling! You are now complete.
  • NO – Contact Support at 1-855-733-5465 to find a pro-installer in your area.

Last updated: September 28, 2018
Was this article helpful?

DIDN'T FIND WHAT YOU'RE LOOKING FOR?

Tweet

Tweet Us

Follow us to stay current on the latest news and events at Honeywell.

Live Chat

Live Chat

8 AM to 10 PM CST,
7 days a week.

Send Mail

Email Us

Don’t need urgent assistance? We’ll get back to you within 48 hours.

Call Us

Call Us

Experts are ready to help Monday to Sunday.