HIGHError Code
13: Limit Circuit Lockout (Furnace - Lennox)Emergency Diagnosis & Repair
Lennox furnace limit switch opened 5 times in one call for heat, locking out system.
What This Error Code Means
Persistent overheating condition detected.
Common Causes
Restricted airflow
Blower motor failure
Dirty coil
Undersized return duct
Failed limit switch
Affected Brands
Lennox
How ROMA Heating Fixes This Error Code
Replace filter and check static pressure
Test blower motor and capacitor
Inspect evaporator coil
Verify duct sizing
Replace limit switch
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