What does the Baxi E.04 – .00 fault code mean?

Your boiler's internal computer cannot communicate with the part that controls the gas supply, meaning it cannot ignite to provide heat or hot water.

How much does it cost to fix Baxi error code E.04 – .00?

Typical repair cost for the Baxi E.04 – .00 fault is £250-£450 including labour.

Gas valve error – gas valve not 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.

Almost always a stuck diverter valve on combis.

Older boilers — thermocouple, draught, gas supply.

Safety-critical — turn off, read this.