Error Code CONTINUOUS FLASH

Goodman GMSS960803BN Error Code CONTINUOUS FLASH: 115 Volt AC power polarity reversed

TL;DR

115 Volt AC power polarity reversed

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 CONTINUOUS FLASH Mean?

115 Volt AC power polarity reversed

Common Causes

Cause	Likelihood	DIY?
Polarity of 115 volt AC power to furnace is reversed	Most common	✗ Call a pro →
Orange and gray wires to transformer are reversed	Common	✗ Call a pro →
Poor unit ground	Common	✗ Call a pro →

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

Sources

Goodman GMSS96 Installation Instructions Manual