Error Code Grounding or Line Polarity Fault
York TM9T100C16MP11 Error Code Grounding or Line Polarity Fault: Grounding or Line Polarity Fault
TL;DR
Grounding or line polarity fault detected. Look for a loose or missing ground wire. Try reversing transformer power. 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 Grounding or Line Polarity Fault Mean?
Grounding or line polarity fault detected. Look for a loose or missing ground wire. Try reversing transformer power.
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