What It Means
- Main power polarity reversed. Switch line and neutral. Improper main ground.
Lennox Ducted Heating
Lennox Error Code DS1 FAST FLASH, DS2 SLOW FLASH
Ducted Heating:
Causes & actions from Lennox
How it shows
- g51mp surelight ds1 ds2 led: DS1 FAST FLASH, DS2 SLOW FLASH (ds1: flashing (fast), ds2: flashing (slow))
This manual entry does not list further causes or actions.
Applicable models & manual sources
- G51MP
Main power polarity reversed. Switch line and neutral. Improper main ground.
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?
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