What does the Alpha 45 fault code mean?

Your boiler is struggling to move water through the system efficiently, causing it to overheat very quickly.

How much does it cost to fix Alpha error code 45?

Typical repair cost for the Alpha 45 fault is £150-350 including labour.

Check that all radiator valves are fully open

High )T. The boiler detects a sudden, unexpected increase in )T between the flow sensor and the system return 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.

Almost always a stuck diverter valve on combis.

Each noise points to a different fault.

Lockout fault with a reset-needed pattern.