What does the Alpha E02 fault code mean?

Your boiler has detected that it is running too hot and has automatically shut down to prevent damage to its internal parts.

How much does it cost to fix Alpha error code E02?

Typical repair cost for the Alpha E02 fault is £120-250 including labour.

Safety thermostat intervention (overheating)

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.

Almost always a stuck diverter valve on combis.

Sludge build-up — needs flushing, not bleeding.