Should my Honeywell thermostat say cool on?

Author: Prof. Stephany Crona  |  Last update: Friday, March 28, 2025

On some occasions, this “Cool On” message may flash for only a short time. If it stops flashing after 5 minutes and the cool air is restored, you have nothing to worry about. This feature is actually a safety measure that's built into the unit.

Why does my Honeywell thermostat say cool on?

The blinking ``Cool On'' means the cool cycle is in delay (5 minute by default). If it's continually blinking then either the thermostat is bad, or there's a short in the low voltage wiring that's causing it to reset everytime it tries to come back on (basically resetting itself over and over).

Why does my AC say cool on but not running?

Dirt and debris can clog air filters over time. And when that happens, it can lead to various problems with your AC. It can restrict airflow and hamper the entire cooling process. That will explain why your thermostat says “cool on,” but you don't feel any cold air in your home.

Why is my Honeywell thermostat not cooling?

Check the Thermostat Settings: - Ensure the thermostat is set to ``Cool'' and that the temperature setting is lower than the current room temperature. Verify Power: - Confirm that the thermostat has power. Check if the display is on and functioning. If not, check the circuit breaker or fuse. Check the Air Filter:

What mode should my Honeywell thermostat be on?

Automatic mode sets the thermostat to follow the temperature program. Operating the thermostat in this mode is the best way to maintain a high level of temperature comfort whilst maximising your energy savings.

Thermostat Cool On or Heat On flashing

How do I know if my Honeywell thermostat is working properly?

Test The Honeywell Thermostat Settings

To try and solve the problem, turn on the heat setting and crank the temperature up to see if the system does anything. If it does power on, you're in luck. Now it's time to test your air conditioning. Change your thermostat to the cool setting and turn the fan to auto.

Should my Honeywell thermostat fan be on auto or on?

"AUTO" is the more energy-efficient option, as it runs the fan only when heating or cooling is actively needed. "ON" keeps the fan running continuously, which can help with air circulation and filtration but may consume more energy.

Why is my thermostat running but not cooling?

This can occur when there are blockages or restrictions in the air ducts, preventing the cool air from reaching your home. Common causes of airflow problems include dirty air filters, blocked vents, and debris in the air ducts.

How do I get my Honeywell thermostat to cool?

To change system settings, touch the mode button on the left-hand side of the thermostat. To switch from heating to cooling, or to turn everything off continue to press the mode button until you have found your desired selection.

Why is my Honeywell fan not blowing cold air?

If your compressor is running, but the air is not blowing through the indoor vents, you may have an issue with the indoor HVAC unit's fan. If your Indoor HVAC unit fan is running and your Outdoor Compressor is not, it's likely an issue with the Compressor itself. In both cases, check with a certified HVAC Technician.

What if my AC is running but not cooling?

In some cases, clogged air filters or dirty evaporator coils can also restrict airflow, forcing the AC to compensate by running at high power. To resolve this issue, it's recommended to check for clogged filters, clean coils, and consider having a professional inspect and repair the motor or fan control components.

How do you reset a Honeywell thermostat?

Access the Menu: Tap the menu icon on the thermostat's touch screen. Hold Down the Weather Button: Press and hold the weather button for five seconds. This will bring up the reset menu. Select Reset Option: Navigate through the options until you find “Factory Reset.” Tap on it to select it.

Why isn't my Honeywell thermostat turning my AC on?

Some possible solutions include resetting the thermostat to factory settings, checking the circuit breaker, replacing the air filter, checking the outdoor unit, checking the indoor unit, replacing the thermostat's batteries, and checking the connections and wiring for any damage.

Why does my thermostat say cool on but nothing is happening?

Check the power source and make sure it is connected and turned on. Verify that the circuit breaker for the AC unit is not tripped. Make sure the thermostat is set to 'COOL' mode. Check the fan setting on the thermostat and ensure it is set to 'AUTO' rather than 'ON'.

How do I make my Honeywell air conditioner colder?

To do this, you can go to your settings on your thermostat, and you'll see a menu for the home and away setting. There, you can set the temperatures, times, and days you want the program to run. When you're done choosing the details of the program you want to set, press “set schedule,” and it will automatically set it.

How do I get my AC to kick on?

Follow these steps.
  1. Step 1: Check the thermostat. Make sure that your thermostat is set to "cool" and not "heat" (if it's set to heat, your AC won't turn on no matter what). ...
  2. Step 2: Check the air filter. ...
  3. Step 3: Check the circuit breakers. ...
  4. Step 4: Clear the condensate drain.

Why does my Honeywell AC say cool on?

This feature is actually a safety measure that's built into the unit. It's intended to give your compressor about 5 minutes to fire up the system components. You may also see this message if your AC unit loses power.

How do I fix my Honeywell thermostat not cooling?

Common Issues and Troubleshooting Steps
  1. Check the Power Source: Ensure your thermostat is receiving power. Replace batteries if your model requires them or check the circuit breaker if it's hardwired.
  2. Inspect the Wiring: Over time, wiring can degrade. ...
  3. Reset Your Thermostat: Sometimes, a simple reset is all it takes.

Does turning down the AC make it colder?

But setting the thermostat really low doesn't increase your air conditioner's cooling capacity. “People think, 'If I make the thermostat set point 60, I'll get more cooling than a set point at 70,' but that's not correct,” Liu said. “You get the same amount of the cooling.”

How to tell if a Honeywell thermostat is bad or bad?

What Are the Signs of a Bad or Broken Thermostat?
  1. The AC or Furnace Won't Come On. ...
  2. The HVAC System Won't Turn Off. ...
  3. The Thermostat Is Unresponsive. ...
  4. The HVAC System Short-Cycles. ...
  5. The Room Temperature Doesn't Match the Thermostat Setting. ...
  6. The Programmed Settings Reset Themselves. ...
  7. Check and Adjust the Settings.

How to check if AC is cooling properly?

Ways To Check If Your AC Is Working Properly
  1. Check the Air Flow. If your AC is trying to cool a room that continues to stay excessively warm, it may not getting enough airflow through the vents. ...
  2. Check the Thermostat. ...
  3. Check for Refrigerant Leaks. ...
  4. Check the Smart Settings. ...
  5. Check the Outdoor Unit.

Why is my thermostat not kicking the AC on?

If the wiring between the thermostat and the air conditioning system is faulty, the system may not turn on. This can happen if the wiring is old or if it has become damaged over time. To fix this issue, you may need to call a professional HVAC technician to inspect and repair the wiring.

Should the thermostat be on auto or cool?

Keeping your thermostat in the AUTO position means less overall energy is being used—and that reduces your utility bills considerably. Not only that, your air filter will last longer than they will if you leave your fan running continuously—in other words, if you leave it in the “on” position.

Why is AC not blowing cold air?

First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.

Previous article
How much does it cost to get a bathtub removed?
Next article
Is Europe dry or moist?