Lennox Ducted Heating

Lennox Error Code LED #1: SLOW FLASH, LED #2: FAST FLASH

Ducted Heating:

What It Means

  • Low flame signal. Measures below .7 microAmps. Replace flame sense rod.

Causes & actions from Lennox

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

This manual entry does not list further causes or actions.

Applicable models & manual sources
  • G24M

    Low flame signal. Measures below .7 microAmps. Replace flame sense rod.

    G24M manual, page 9

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

What should you check next?

Continue in ACLogics with guided diagnosis for your equipment and symptoms.

See how guided diagnosis works →