What does the Alpha 04 fault code mean?

Your boiler has detected an electrical issue with the internal component that controls the gas supply, prevent it from firing up safely.

How much does it cost to fix Alpha error code 04?

Typical repair cost for the Alpha 04 fault is £150-£250 including labour.

Gas valve wiring circuit fault detected

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Older boilers — thermocouple, draught, gas supply.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.