Error Code LED Steady On (Continuous)
Info

Goodman GMSS960803BN Error Code LED Steady On (Continuous): Normal Operation

TL;DR
Your Goodman GMSS960803BN is operating normally. The steady LED confirms no faults are present.
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 LED Steady On (Continuous) Mean?

A steady (continuously on) LED on the Goodman GMSS960803BN control module indicates normal operation. The furnace is either actively running a heating cycle or standing by in idle mode, ready to respond when the thermostat calls for heat. There are no active fault codes.

The GMSS960803BN uses a single diagnostic LED on the integrated control module to communicate system status. When the LED remains solidly lit without flashing, the control module has completed its self-checks and found no faults in any monitored circuits.

No action is needed. If you are experiencing a comfort issue despite the normal LED status, the problem may lie outside the furnace itself — check your thermostat settings, ensure supply registers are open, and verify the thermostat batteries are not low.

Contact a licensed HVAC technician if any of these apply:

Sources

  1. Installation Instructions for *MSS9* & *CSS9* Single-Stage Gas Furnace

✓ Verified against manufacturer service manual — March 2026