What does the Worcester Bosch Fast flash fault code mean?

Your boiler has detected a critical internal error with its electronic brain or air flow system and has locked itself for safety.

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

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

Manufacturer manual

Volatile lockout sensor fan or code plug

Shared across the range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

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

Boiler cover options

A cover plan would handle faults like Fast flash: no call-out fees, no surprise bills.

Approved partner

Domestic Appliance Guard

Unlimited call-outs, 24/7 helpline, no price-hike promise

Affiliate links. We may earn a commission at no extra cost to you.

Seeing a different code? Every code this model can display, in one place.

Each noise points to a different fault.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.