How do I fix Trane 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.

Trane | Furnaces

Error Code 8 Flashes

Troubleshooting guide for the Trane 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.

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