Lennox | Numeric Codes (E-Codes)

Error Code E202

Troubleshooting guide for the Lennox Numeric Codes (E-Codes) system fault E202.

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

Lost Communication with Outdoor Unit. The control board cannot communicate with the outdoor unit (communicating systems).

Potential Causes & Solutions

  • Wiring issue, bad control board.

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