⚠

warning Honeywell

Error Code Triangle with exclamation mark

Caution or alert message indicator — the thermostat is signaling a warning or alert condition that requires attention.

? What Causes This

Various system alerts or warning conditions detected by the thermostat.

✓ How to Fix It

Press the Menu button until the alert screen appears.
Press Select to view the specific alert message.
Address the issue indicated by the alert.

This error code appears in:

Honeywell T4 Pro Thermostat