What does the Alpha 45 fault code mean?

Your boiler has detected that the water is heating up or circulating much faster than it should, which often points to a blockage or a pump issue.

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

Typical repair cost for the Alpha 45 fault is £150-300 including labour.

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.

Each noise points to a different fault.

Almost always a stuck diverter valve on combis.

Sludge build-up — needs flushing, not bleeding.