Lennox Ducted Heating

Lennox Error Code LED #1 ON / LED #2 ON

Ducted Heating:

What It Means

  • Control self-check OKAY? NO branch: gas valve OFF, combustion air blower OFF, indoor blower delay OFF. Both lamps ON. Reset control by turning main power OFF. The extraction incorrectly attached this output to polarity; original graph and Table2 identify control self-check/circuit failure.

Causes & actions from Lennox

How it shows
  • SureLight board LEDs (DS1/DS2): LED #1 ON / LED #2 ON (led1: on, led2: on)

Polarity reversed check failed during initial turn inducer on check. Gas valve off, combustion air blower off, indoor blower delay off.

Applicable models & manual sources
  • G24M

    Control self-check OKAY? NO branch: gas valve OFF, combustion air blower OFF, indoor blower delay OFF. Both lamps ON. Reset control by turning main power OFF. The extraction incorrectly attached this output to polarity; original graph and Table2 identify control self-check/circuit failure.

    G24M manual, page 27

Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.

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