Honeywell Timer Switch Not Working. Replace the bulb with a new one. As the screen of your thermostat is not working, you have to forget about the screen first.

Your old mechanical clock not automatically catching up with seasonal clocks changes; You might think that this is a weird process but this works! I hooked it up initially and thought i was doing something wrong because it was not working, but after troubleshooting with a handyman, i have basically determined that the gfci in my garage is tripping whenever i hook up the switch.

Honeywell Thermostat Blowing Cold Air. A dirty air filter blocks airflow over the furnace's heat exchanger, causing it to overheat. I bought a honeywell t5 but when in the heating mode it blows cold air.

4) issues with thermostat wiring. 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. Most honeywell thermostats blink when in a time delay for the cooling (or heating if it's a heat pump).