Troubleshooting steps
Replace air filter verify airflow reset system
HVAC Error Codes
FL – Filter lockout
Filter lockout activated due to dirty filter
Details
Dirty air filter has caused system to lock out to protect equipment.
Error typealarm
MeaningFilter lockout
Typical causesDirty filter severely restricted airflow
SolutionsReplace air filter verify airflow reset system
Severitymedium
Catalog references
Where this appears
TraneFL
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FAQ
Common questions
How to reset?
Replace filter then power cycle system or press reset button.
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