Lennox SLP98UHV Error Code E 131: Corrupted Control Parameters
What Does Code E 131 Mean?
Error code E131 on the Lennox SLP98UHV indicates that the control board's stored configuration parameters have become corrupted. These parameters include the unit size code, blower speed settings, gas valve staging, and other operating values that the board needs to run the furnace correctly.
The most common cause is a power surge or interruption that corrupted the non-volatile memory where these settings are stored. Lightning strikes, utility power fluctuations, and abrupt power cuts can all cause memory corruption. Less commonly, a failing memory chip on the control board itself can cause settings to degrade over time.
A technician must first attempt to reconfigure the system by re-entering the correct unit size codes and operating parameters through the setup process. If the board accepts the new configuration and operates normally, the problem is solved. If the parameters corrupt again or the board cannot hold the configuration, the control board itself needs to be replaced.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Power surge or interruption corrupted control board memory | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- The system needs to be reconfigured by a technician with the correct unit codes
- E131 appeared after a power surge or outage
- The furnace is not providing heating or cooling after the configuration was lost
- The control board cannot hold its configuration and may need replacement
✓ Verified against manufacturer service manual — March 2026