CRITICALError Code
E001: Air Supply/Exhaust Blockage (Boiler)
Navien boiler detected blockage in air supply or exhaust venting and shut down.
What This Error Code Means
The air pressure switch detected improper venting or combustion air supply.
Common Causes
Blocked vent pipe
Combustion air intake clogged
Vent termination obstructed
Bird or pest nest in vent
Condensate pooling in exhaust
Affected Brands
NavienViessmannWeil-McLainBuderusLochinvar
How ROMA Heating Fixes This Error Code
Inspect entire vent and intake path
Clear all blockages
Check vent slope and drainage
Clean intake screen
Test and confirm no recurrence
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