Troubleshooting steps
Check air filter, verify airflow, check refrigerant charge
HVAC Error Codes
Lennox E77 Error
Indoor coil freeze protection
Details
Lennox E77 error indicates indoor coil freeze protection. Low airflow, dirty filter, low refrigerant. Check air filter, verify airflow, check refrigerant charge.
Error typeerror
MeaningIndoor coil freeze protection
Typical causesLow airflow, dirty filter, low refrigerant
SolutionsCheck air filter, verify airflow, check refrigerant charge
Severityhigh
Catalog references
Where this appears
LennoxE77
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What causes E77 error?
Low airflow, dirty filter, low refrigerant
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