What It Means
- Control self-check OKAY? NO branch: gas valve OFF, combustion air blower ON, indoor blower ON; both lamps alternating fast flash; check broken ignitor/open ignitor circuit.
Lennox Ducted Heating
Lennox Error Code LED #1 ALTERNATING FAST FLASH / LED #2 ALTERNATING FAST FLASH
Ducted Heating:
Causes & actions from Lennox
How it shows
- SureLight board LEDs (DS1/DS2): LED #1 ALTERNATING FAST FLASH / LED #2 ALTERNATING FAST FLASH (led1: flashing (fast), led2: flashing (fast))
Control self-check not okay. Gas valve off, combustion air blower on, indoor blower on. Check for broken ignitor or open ignitor circuit.
Applicable models & manual sources
- G24M
Control self-check OKAY? NO branch: gas valve OFF, combustion air blower ON, indoor blower ON; both lamps alternating fast flash; check broken ignitor/open ignitor circuit.
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.
