Air Supply/Exhaust Blockage (Navien)

Navien boiler detected a blockage in the air supply or exhaust venting system and shut down.

Common Causes

• Blocked vent pipe from debris or ice
• Exhaust pipe improperly sloped causing condensate pooling
• Combustion air intake screen clogged
• Vent termination too close to wall or obstruction
• Bird or pest nest in vent

How ROMA Heating Fixes This

• Inspect entire vent and intake path for blockages
• Clear debris, ice, or obstructions from venting
• Check vent slope and condensate drainage
• Clean intake screen and verify proper termination clearance
• Test operation and confirm no recurrence