015
FAULT CODE
Navien
PCB Fault
High Severity
Engineer Required
The main printed circuit board has an internal error or communication fault.
Step-by-Step Fix Guide
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Step 1
Try power-cycling the boiler
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Step 2
If the error persists, the PCB may need replacing
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Step 3 Engineer only
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.