How do I fix American Standard error code 8 Flashes?

Switch off power and carefully clean the flame sensor rod (remove carbon buildup). Ensure good sensor positioning in the flame. If the error continues, the flame sensor could be faulty—replace it. Also consider low gas pressure or dirty burners as causes and address those with a technician.

American Standard | Furnaces

Error Code 8 Flashes

Troubleshooting guide for the American Standard Furnaces system fault 8 Flashes.

Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.

System Diagnosis

Weak flame signal (poor flame sense). The burner’s flame is present but not detected strongly by the sensor (could extinguish).

Potential Causes & Solutions

Switch off power and carefully clean the flame sensor rod (remove carbon buildup).
Ensure good sensor positioning in the flame.
If the error continues, the flame sensor could be faulty—replace it.
Also consider low gas pressure or dirty burners as causes and address those with a technician.

Diagnose with Confidence

Use the ACLogics AI assistant to walk through this error code step-by-step.

Get the App

Included in Diagnosis Workflow

Ask

Upload nameplate & symptoms

Diagnose

AI identifies error 8 Flashes

Report

Generate professional PDF