What It Means
- Low flame signal. Measures below Control board 32M88 - 0.18 microamps Control board 78M47 & 100973-01 - 1.5 microamps Replace flame sense rod.
Lennox Ducted Heating
Lennox Error Code SLOW FLASH, FAST FLASH
Ducted Heating:
Causes & actions from Lennox
How it shows
- SureLight board LEDs (DS1/DS2): SLOW FLASH, FAST FLASH (led1: flashing (slow), led2: flashing (fast))
- SureLight board LEDs (DS1/DS2): SLOW FLASH, FAST FLASH (led1: flashing (slow), led2: flashing (fast))
- SureLight board LEDs (DS1/DS2): SLOW FLASH, FAST FLASH (led1: flashing (slow), led2: flashing (fast))
This manual entry does not list further causes or actions.
Applicable models & manual sources
- G43UF
Low flame signal. Measures below Control board 32M88 − 0.18 microamps Control board 78M47 & 100973−01 − 1.5 microamps Replace flame sense rod.
- G43UF
Low flame signal. Measures below Control board 32M88 − 0.18 microamps Control board 78M47 & 100973−01 − 1.5 microamps Replace flame sense rod.
- G43UF
Low flame signal. Measures below Control board 32M88 − 0.18 microamps Control board 78M47 & 100973−01 − 1.5 microamps Replace flame sense rod.
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.
