What does the Alpha 03 fault code mean?

Your boiler has detected that the exhaust gases are becoming dangerously hot and has automatically shut down to prevent damage or overheating.

How much does it cost to fix Alpha error code 03?

Typical repair cost for the Alpha 03 fault is £150-250 including labour.

Flue sensor intervention (flue temperature too high)

This is a emergency 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.

Lockout fault with a reset-needed pattern.

Sludge build-up — needs flushing, not bleeding.