Error Code Flame Sensed Out of Sequence
Lennox SLP98UHV Error Code Flame Sensed Out of Sequence: Flame Sensed Out of Sequence
TL;DR
The flame sensor is detecting a flame when there should not be one. This may indicate a gas valve leak. 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 Flame Sensed Out of Sequence Mean?
The flame sensor is detecting a flame when there should not be one. This may indicate a gas valve leak.
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