Skip to the fix

Heating, cooling and hot water problems, fixed

Search a problem

Air conditioning Furnaces Heat pumps Mini splits Thermostats Water heaters

Home / Thermostats

Thermostats

Blank screens, wiring, Honeywell, Nest and ecobee faults.

No guides in here yet.

HeatCoolFix is a repair guide for the machines that heat and cool a home: furnaces, air conditioners, heat pumps, mini splits, thermostats and water heaters. One fault per page, checked in the order a technician checks it.

heatcoolfix.com

Pick your machine

Air conditioning
Furnaces
Heat pumps
Mini splits
Thermostats
Water heaters

Newest guides

Water Heater Element: How to Test One and Change It
Water Heater Leaking: How to Find Where It Is Coming From

How this site works

Every guide is a fault, not a product review. The steps are in the order a technician checks them, and the parts and numbers come from the makers’ own manuals.

About

© 2026 HeatCoolFix Gas, refrigerant and mains wiring work belongs to a licensed technician. When a step says stop, stop.