What does the Worcester Bosch Slow flash fault code mean?

Your boiler thinks it can see a flame still burning even though it has told the system to shut down.

How much does it cost to fix Worcester Bosch error code Slow flash?

Typical repair cost for the Worcester Bosch Slow flash fault is £180-450 including labour.

Flame detected even though appliance switched off.

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.