HIGHError Code
E012: Combustion Fan Error (Boiler)
Boiler combustion fan not operating at correct speed or has failed.
What This Error Code Means
Combustion blower fan RPM is outside expected range.
Common Causes
Fan motor failed
Bearing seized
Blockage in fan housing
Board fan output fault
Speed sensor failure
Affected Brands
NavienViessmannLochinvar
How ROMA Heating Fixes This Error Code
Check fan operation and noise
Measure fan RPM feedback
Inspect housing for obstructions
Test voltage at fan motor
Replace fan assembly if failed
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