Lennox | Numeric Codes (E-Codes)

Error Code E312

Troubleshooting guide for the Lennox Numeric Codes (E-Codes) system fault E312.

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

Reduced Airflow (Blower Speed). The blower is running at a reduced speed to prevent damage.

Potential Causes & Solutions

  • High static pressure, dirty filter, blocked ducts.

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