What It Means
- Watchguard -- burners failed to ignite OR: limit open more than 3 minutes (control board 32M88 Only) OR: lost flame sense 5 times in one heating cycle OR: prove switch opened 5 times in one heating cycle
Lennox Ducted Heating
Lennox Error Code ALTERNATING SLOW FLASH
Ducted Heating:
Causes & actions from Lennox
How it shows
- SureLight board LEDs (DS1/DS2): ALTERNATING SLOW FLASH (led1: flashing (slow), led2: flashing (slow))
- SureLight board LEDs (DS1/DS2): ALTERNATING SLOW FLASH (led1: flashing (slow), led2: flashing (slow))
- SureLight board LEDs (DS1/DS2): ALTERNATING SLOW FLASH (led1: flashing (slow), led2: flashing (slow))
This manual entry does not list further causes or actions.
Applicable models & manual sources
- G43UF
Watchguard −− burners failed to ignite OR: limit open more than 3 minutes (control board 32M88 Only) OR: lost flame sense 5 times in one heating cycle OR: prove switch opened 5 times in one heating cycle
- G43UF
Watchguard −− burners failed to ignite OR: limit open more than 3 minutes (control board 32M88 Only) OR: lost flame sense 5 times in one heating cycle OR: prove switch opened 5 times in one heating cycle
- G43UF
Watchguard −− burners failed to ignite OR: limit open more than 3 minutes (control board 32M88 Only) OR: lost flame sense 5 times in one heating cycle OR: prove switch opened 5 times in one heating cycle
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.
