What It Means
- Normal operation - signaled when heating demand initiated at thermostat.
Lennox Ducted Heating
Lennox Error Code LED #1: SIMULTANEOUS FAST FLASH, LED #2: SIMULTANEOUS FAST FLASH
Ducted Heating:
Causes & actions from Lennox
How it shows
- SureLight board LEDs (DS1/DS2): LED #1: SIMULTANEOUS FAST FLASH, LED #2: SIMULTANEOUS FAST FLASH (led1: flashing (fast), led2: flashing (fast))
This manual entry does not list further causes or actions.
Applicable models & manual sources
- G24M
Normal operation − signaled when heating demand initiated at thermostat.
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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Continue in ACLogics with guided diagnosis for your equipment and symptoms.
