Error Code No Y2 Output to Non-Communicating Outdoor Unit
Lennox SLP98UHV Error Code No Y2 Output to Non-Communicating Outdoor Unit: No Y2 Output to Non-Communicating Outdoor Unit
TL;DR
No 24-volt output detected on Y2 to C terminal with a non-communicating outdoor unit. The second stage cooling relay has failed. 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 No Y2 Output to Non-Communicating Outdoor Unit Mean?
No 24-volt output detected on Y2 to C terminal with a non-communicating outdoor unit. The second stage cooling relay has failed.
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