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Why is my thermostat blinking cool on. The reason why honeywell thermostat blinking cool on is maybe the thermostat devices taking delay time to prevent the ac from short cycling. If your thermostat is blinking “cool on” one of three things has taken place. Here are the main reasons why your honeywell thermostat is blinking “cool on”:

A power outage or some other interruption associated with a power source can trigger. Here is what you need to do to check this: Honeywell thermostat says cool on blinking or heat on flashing, but not working after changing batteries.

All you need to do is change the batteries in the thermostat. Once he arrived, he came up plus stated that the thermostat just needed to be replaced. Dirty coils can cause honeywell thermostat flashing “cool on”.

Check also the time on your thermostat if it’s off or not set. Check the thermostat's display to confirm that there's a call for cooling, usually indicated by the words cool on or a snowflake icon. However, the cool on flashing may.

Leave the unit for a while and check whether the system is going to start cooling or not. The most common cause of a thermostat blinking green light is a problem with the heating system. Luckily this is an easy enough thing to fix.

However, if your thermostat keeps blinking after the reset, you may have an issue like excessive defrosting or a switch in the outside unit that is stuck open. Review and configure your settings accordingly. If your thermostat is showing a blinking snowflake icon don’t panic, there’s nothing wrong with your system.