Error Code Control Self-Check Failed / Internal Hardware Error
Lennox SLP98UHV Error Code Control Self-Check Failed / Internal Hardware Error: Control Self-Check Failed / Internal Hardware Error
TL;DR
The integrated furnace control failed its self-check. This covers hardware errors including flame sense circuit faults and pin shorts. The control will restart if the error recovers. Disclaimer
This article is for informational purposes only and does not guarantee the accuracy or completeness of the information provided. Always turn off power and gas supply before attempting any repairs. If you smell gas, leave immediately and call your gas company. Consult a licensed HVAC technician for diagnosis and repair. Any actions taken based on this information are at your own risk. What Does Code Control Self-Check Failed / Internal Hardware Error Mean?
The integrated furnace control failed its self-check. This covers hardware errors including flame sense circuit faults and pin shorts. The control will restart if the error recovers.
When to Call a Professional
Contact a licensed HVAC technician if:
- Basic troubleshooting did not resolve the error
- You smell gas at any point during the process
- You are not comfortable working around gas lines or electrical components
- The unit needs a gas valve, control board, or motor replacement