352
FAULT CODE
Navien
High Water Pressure
Medium Severity
Engineer Required
The system water pressure is too high. The boiler should auto-reset once pressure drops.
Step-by-Step Fix Guide
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Step 1
Do NOT add more water
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Step 2
Check the filling loop is closed
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Step 3 Engineer only
If pressure remains high, call a Gas Safe engineer
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.