Error Code 7 FLASHES

Goodman GMSS920803BN Error Code 7 FLASHES: Low flame sense signal

TL;DR

Low flame sense signal

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 7 FLASHES Mean?

Low flame sense signal

Common Causes

Cause	Likelihood	DIY?
Flame sensor is coated or oxidized	Most common	✗ Call a pro →
Flame sensor incorrectly positioned in burner flame	Common	✗ Call a pro →
Lazy burner flame due to improper gas pressure or combustion air	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 GMSS9 Series Service Instructions Manual