What It Means
- Primary or secondary limit switch open. Limit must close within 3 minutes or unit goes into 1 hour Watchguard.
Lennox Ducted Heating
Lennox Error Code SLOW FLASH, ON
Ducted Heating:
Causes & actions from Lennox
How it shows
- SureLight board LEDs (DS1/DS2): SLOW FLASH, ON (led1: flashing (slow), led2: on)
- SureLight board LEDs (DS1/DS2): SLOW FLASH, ON (led1: flashing (slow), led2: on)
- SureLight board LEDs (DS1/DS2): SLOW FLASH, ON (led1: flashing (slow), led2: on)
This manual entry does not list further causes or actions.
Applicable models & manual sources
- G43UF
Primary or secondary limit switch open. Limit must close within 3 minutes or unit goes into 1 hour Watchguard.
- G43UF
Primary or secondary limit switch open. Limit must close within 3 minutes or unit goes into 1 hour Watchguard.
- G43UF
Primary or secondary limit switch open. Limit must close within 3 minutes or unit goes into 1 hour Watchguard.
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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