What does the Worcester Bosch 353 fault code mean?

Your boiler has detected an internal electronic error during a safety self-test and has shut itself down to prevent unsafe operation.

How much does it cost to fix Worcester Bosch error code 353?

Typical repair cost for the Worcester Bosch 353 fault is £150-300 including labour.

Manufacturer manual

Test non-volatile lockout

Shared across the Greenstar 1000 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.

Lockout test mode

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 353: 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.

7 signs repair isn't worth it anymore.

Break-even maths on monthly cover.

What a UK service costs and what a proper one includes.