What does the Alpha 45 fault code mean?

Your boiler has identified that the water is heating up or circulating much faster than it should be, causing the system to shut down for safety.

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 ΔT 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.

Sludge build-up — needs flushing, not bleeding.

7 signs repair isn't worth it anymore.