What It Means
- Thermostat demand satisfied: both lamps simultaneous slow flash. Combustion inducer continues5second postpurge; indoor blower completes selected OFF delay; ACB.HEAT speed, HTG ACC and ACC terminals OFF.
Lennox Ducted Heating
Lennox Error Code LED #1 & #2 Simultaneous Slow Flashes
Ducted Heating:
Causes & actions from Lennox
How it shows
- SureLight board LEDs (DS1/DS2): LED #1 & #2 Simultaneous Slow Flashes (led1: flashing (slow), led2: flashing (slow))
Normal operation. Thermostat demand satisfied.
Applicable models & manual sources
- G24M
Thermostat demand satisfied: both lamps simultaneous slow flash. Combustion inducer continues5second postpurge; indoor blower completes selected OFF delay; ACB.HEAT speed, HTG ACC and ACC terminals OFF.
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.
