Fix Your Thermostat
Without Calling an HVAC Tech
Expert step-by-step guides for Nest, Honeywell, Ecobee, and more. Diagnose the problem, fix it yourself, and save hundreds on service calls.
Thermostat Not Working
Step-by-step troubleshooting for any thermostat that stopped working
Thermostat Wiring Guide
Complete wiring diagrams, color codes, and connection guides
Fixing Nest Thermostat
Common Nest problems and proven solutions from HVAC pros
Wire Color Code
What each thermostat wire color means and where it connects
Guides by Brand
Find troubleshooting and repair guides specific to your thermostat brand.
Ecobee
White-Rodgers
Thermostat Wiring Made Simple
Don't let tangled wires intimidate you. Our color-coded wiring guides show you exactly which wire goes where — whether you're installing a new thermostat or troubleshooting a wiring issue.
- R, W, Y, G, C, O/B wire color codes explained
- Heating, cooling, and heat pump wiring diagrams
- What to do when you don't have a C wire
- Brand-specific wiring differences
Common Wire Color Codes
Why Homeowners Trust ThermostatFixer
Easy-to-Follow Steps
Every guide breaks down complex HVAC problems into simple, numbered steps anyone can follow.
Safety First
Clear safety warnings and "when to call a pro" guidance so you never put yourself at risk.
Brand-Specific Guides
Not generic advice — detailed guides for Nest, Honeywell, Ecobee, White-Rodgers and more.