What does the Keston E23 fault code mean?

Your boiler is struggling to detect or maintain the correct amount of water inside the system.

How much does it cost to fix Keston error code E23?

Typical repair cost for the Keston E23 fault is £100-220 including labour.

Check the pressure gauge on the front of the boiler; it should be between 1.0 and 1.5 bar.

Water filling error – check water pressure sensor

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.

Safety-critical — turn off, read this.