011
FAULT CODE
Navien
Abnormal Air Pressure
High Severity
Engineer Required
The air pressure switch is not detecting correct air flow through the combustion chamber.
Step-by-Step Fix Guide
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Step 1
Check the flue for external blockages
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Step 2 Engineer only
A Gas Safe engineer should inspect the air pressure switch, fan, and venturi
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.