What does the Alpha 03 fault code mean?

Your boiler has detected that the exhaust gases are becoming dangerously hot, so it 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 £150-300 including labour.

High flue thermostat temperature - Flue thermostat intervention (flue temperature over 113°C)

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.

Work through these before the call-out.

Lockout fault with a reset-needed pattern.