Code 25 — Invalid Model Detected

What does 25 mean?

This fault indicates that the system control board has detected an invalid model type or configuration. This can happen with various components like the Furnace, Fan Coil, GeoHP, Greenspeed/Extreme, or Infinity/Evolution ODU units.

• Incorrect model plug installed on a control board
• Control board incompatible with the installed unit
• Misconfiguration during installation or service
• Software corruption on the control board

Click steps to track your progress.

1. 1

   Turn off the power to the entire HVAC system at the circuit breaker for 30 seconds.

2. 2

   Restore power and allow the system to attempt to re-identify its components.

3. 3

   Check that all accessories and modules are correctly seated and compatible.

4. 4

   If the error persists, contact a qualified HVAC technician as this often requires re-programming or hardware verification.