Lennox Ducted Heating

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

Ducted Heating:

What It Means

  • Rollout CLOSED? NO: gas valve OFF, combustion air blower OFF, indoor blower OFF with delay; hold until rollout closes. LED1 ON AND LED2 SLOW flash.

Causes & actions from Lennox

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

Rollout switch open. Gas valve off, combustion air blower off, indoor blower off with delay. Sequence holds until rollout switch closes.

Applicable models & manual sources
  • G24M

    Rollout CLOSED? NO: gas valve OFF, combustion air blower OFF, indoor blower OFF with delay; hold until rollout closes. LED1 ON AND LED2 SLOW flash.

    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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