Carrier 58MVP Error Code 25: Model Selection or Setup Error
What Does Code 25 Mean?
Status code 25 on the Carrier 58MVP indicates the control board has detected a model selection or setup error. The 58MVP uses a model plug (PL4) that identifies the specific furnace model to the control board, and setup switches (SW1-1 and SW1-6) that configure operating parameters for the installation.
If code 25 flashes only four times at power-up, the control board is falling back to a model selection stored in its memory. This typically means the model plug is missing but the board previously had a valid configuration saved. If the code flashes continuously, the board has no valid configuration and cannot operate correctly.
This code usually appears after a control board replacement when the model plug is not transferred from the old board, or after service work when a setup switch gets bumped out of position. A technician needs to confirm the correct model plug is installed, check the setup switch positions against the installation manual, and verify compatibility between the board software version and the model plug.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Model plug (PL4) missing or incorrect | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- When this code appears — verifying and correcting the model plug and setup switch configuration requires a technician with access to the installation documentation
✓ Verified against manufacturer service manual — March 2026