What does the Heatline E04 fault code mean?

Your boiler has stopped working because the water pressure is too low and needs to be topped up.

How much does it cost to fix Heatline error code E04?

Typical repair cost for the Heatline E04 fault is £0-120 including labour.

Locate the filling loop (usually a silver flexible hose) underneath the boiler.

Water pressure low: The system water pressure has dropped below the minimum operating level (typically 0.5 bar).

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.