What does the Keston E03 fault code mean?

Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.

How much does it cost to fix Keston error code E03?

Typical repair cost for the Keston E03 fault is £90-280 including labour.

Check that the boiler pressure gauge is between 1.0 and 1.5 bar.

Boiler overheat – check that any valves to the heating circuit have not been shut down, no air in the system and that the water pressure is correct

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

Each noise points to a different fault.

Work through these before the call-out.

Lockout fault with a reset-needed pattern.