What does the Navien E02 fault code mean?

Your boiler has stopped working because the water pressure inside the system has dropped too low.

How much does it cost to fix Navien error code E02?

Typical repair cost for the Navien E02 fault is £80-120 including labour.

Locate the external filling loop, which is a silver braided hose connecting two pipes near your boiler.

The pressure is lower than the minimum pressure set (1 bar by default)

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Six most common causes of dropping pressure.

Step-by-step using the filling loop.

7 signs repair isn't worth it anymore.