Bryant 315AAV Error Code 25: Invalid Model Selection or Setup Error
What Does Code 25 Mean?
Status code 25 on the Bryant 315AAV indicates a model configuration mismatch. The integrated furnace control uses a physical model plug (connector PL4) and dip switches (SW1-1 and SW1-6) to identify the specific furnace model and configure operating parameters including BTU capacity and airflow settings.
The code behaves differently depending on how it appears. If code 25 flashes only 4 times at power-up and then stops, the control has detected a discrepancy but is defaulting to the model selection stored in its memory — the furnace may continue to operate in a limited mode. If code 25 flashes continuously, the control cannot determine the correct model configuration and will not proceed with heating.
This fault most commonly appears after a control board replacement if the installer did not transfer or correctly configure the model plug and setup switches for the specific 315AAV unit being serviced. The model plug carries information about BTU rating, staging, and airflow that the control board uses to set correct operating parameters.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Model plug PL4 is missing or incorrect | Most common | ✗ Call a pro → |
| Setup switches SW1-1 or SW1-6 improperly positioned | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Contact a technician to verify the model plug at PL4 and confirm setup switches SW1-1 and SW1-6 are in the correct positions for this unit
- Do not change dip switch positions without confirming the correct settings for this specific model from the installation manual
✓ Verified against manufacturer service manual — March 2026