Incredible Honeywell Ac Not Working Cool On Flashing References. The “cool on” message on a honeywell thermostat is also known as “delay mode”. This can cause the “cool on”.

The “cool on” message on a honeywell thermostat is also known as “delay mode”. Check the furnace door and its power switch. The first step is to determine if your system is cooling at all and if it can control it.