Thermostat Not Working

Thermostat blank or unresponsive? Learn causes, DIY fixes, and replacement costs ($100–$350).

Typical repair cost: $100–$350 · DIY difficulty: Easy · About 10–20 minutes.

What usually causes it

• Dead batteries
• Tripped breaker
• Loose wiring
• Dirty contacts
• Incompatible thermostat

What you need

• Replacement batteries
• Screwdriver

How to fix it yourself

1. Replace the batteries (most thermostats use AA or AAA)
2. Check the circuit breaker for the HVAC system
3. Remove the thermostat cover and gently clean contacts with a soft brush
4. Ensure all wires are securely connected
5. Try resetting to factory defaults

When to call a pro

If the display works but the system doesn't respond, or if you need a new thermostat installed.

Get a fixed price from a local pro