Carrier 58MVP Error Code 25: Model Selection or Setup Error
What Does Code 25 Mean?
Status code 25 on the Carrier 58MVP is a model selection or setup error. The board identifies which furnace it is running through a model plug (PL4) and setup switches; if PL4 is missing or wrong, or if setup switch SW1-1 or SW1-6 is positioned improperly, the control flags this code. Carrier's guide notes that if the code flashes only 4 times on power-up, the control is defaulting to the model selection stored in memory.
This almost always follows a control-board replacement or service where the model plug was not transferred or the setup switches were left in the wrong position. Because the 58MVP is variable-capacity, correct model configuration determines airflow and staging behavior, so the setup must match the specific furnace. It is a lower-severity, configuration-level fault rather than a hardware failure.
Verifying the model plug and setup-switch positions against Carrier's documentation is part of proper commissioning and should be done by a technician; incorrect settings can cause improper operation.
What You'll Notice
- The code appears right after a control-board replacement or service
- The board LED flashes code 25, or exactly 4 flashes on power-up indicating a memory default
- The furnace may run but with incorrect airflow or staging behavior
- The setup switches or the PL4 plug look disturbed
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Model plug (PL4) missing or incorrect | Most common | ✗ Call a pro → |
How This Is Diagnosed
A technician confirms the PL4 model plug is present and correct for the furnace, then verifies setup switches SW1-1 and SW1-6 against the installation instructions for the specific 58MVP model and capacity. Correcting the plug or switch positions clears the code. This is board-level configuration work for a professional.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- The code appeared after a control board was replaced or serviced
- The furnace's airflow or staging seems wrong
- You are unsure whether the model plug or setup switches are set correctly
Frequently Asked Questions
What triggers code 25 on a Carrier 58MVP?
A missing or incorrect model plug (PL4), or a setup switch (SW1-1 or SW1-6) in the wrong position — most often after a control-board replacement.
Will the furnace still run with code 25?
It may run using a default stored configuration, but the setup should be corrected so airflow and staging match your specific furnace.
Sources
✓ Verified against manufacturer service manual — March 2026