If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. This delay is to protect your equipment from short cycling. 3. If the thermostat indicates a call for cool, verify that the furnace door is securely closed and that the power switch on the furnace is set to On. 4.
Remove the thermostat from the base plate. Remove your unit from the base plate like you would to change the batteries. Grab the thermostat body with one hand on each side and gently pull it off of the base plate that is attached to the wall. Tell us if your unit has a wire hooked up to the C terminal.
The thermostat displays a “Delayed” message on the screen (For example: Delayed for: 3:20). Strange noises coming from your thermostat (Due to thermostat turning off and on at a fast pace). Your heating or cooling system will not turn off. Heating constantly turns on & of in short intervals. System fan turns on & off