What does the Navien E302 fault code mean?

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

How much does it cost to fix Navien error code E302?

Typical repair cost for the Navien E302 fault is £80-150 including labour.

Locate the internal filling loop (usually a silver braided hose or a plastic linkage under the boiler).

If the pressure is lower than the minimum pressure set (1 bar by default), error code E302 will appear on the display.

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.