What does the Keston E18 fault code mean?

Your boiler has detected that the water inside is getting too hot too quickly because it is not moving through the system properly.

How much does it cost to fix Keston error code E18?

Typical repair cost for the Keston E18 fault is £120-£350 including labour.

Check that all radiator valves are fully open

Flow overheat – check water circulation

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.

Sludge build-up — needs flushing, not bleeding.

7 signs repair isn't worth it anymore.