What does the Keston E 30 fault code mean?

Your boiler has detected that the water inside the unit is not moving fast enough, meaning it is getting too hot, too quickly.

How much does it cost to fix Keston error code E 30?

Typical repair cost for the Keston E 30 fault is £150-350 including labour.

Difference between flow and return temperatures too high. Check 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.

Almost always a stuck diverter valve on combis.

Each noise points to a different fault.

7 signs repair isn't worth it anymore.