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Here is a list of common error codes for Lennox HVAC systems:

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  1. E1 – Indoor air sensor open
  2. E2 – Indoor air sensor short
  3. E3 – Outdoor air sensor open
  4. E4 – Outdoor air sensor short
  5. E5 – Communication error between indoor and outdoor units
  6. E6 – Indoor unit fan speed error
  7. E7 – Outdoor unit fan speed error
  8. E8 – Freeze protection error
  9. E9 – High-pressure switch error
  10. E10 – Low-pressure switch error
  11. E11 – Reverse polarity error
  12. E12 – Voltage error
  13. E13 – Current error
  14. E14 – Overcurrent protection error
  15. E15 – Overheat protection error
  16. E16 – Inverter compressor drive error
  17. E17 – Refrigerant pressure sensor error
  18. E18 – Indoor unit evaporator temperature sensor error
  19. E19 – Outdoor unit condenser temperature sensor error

These error codes may vary depending on the specific model and type of Lennox HVAC system. It is important to refer to the owner’s manual for specific error codes and troubleshooting procedures.