008
FAULT CODE
Navien
Exhaust Blockage
High Severity
Engineer Required
The flue is blocked or partially obstructed.
Step-by-Step Fix Guide
-
Step 1 Engineer only
Check the external flue terminal for blockages
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.