Worcester Bosch Greenstar 4000 Fault codes & diagnostics

No fault codes listed yet: we only list codes read from this boiler's own manual.

CombiSystem Natural GasLPG 24-30 kW 2021-present

Choose your boiler type

The Greenstar 4000 range comes in 2 types

Pick the one you have. The fault codes, GC numbers and manual differ by type.

Each model has its own manual A family spans several manuals, one per model or generation. Pick your model above and its page has the manual its fault codes were read from.

No fault codes for this model yet

We haven't got the Worcester Bosch Greenstar 4000 manual yet. We don't fill the gap with codes from a similar boiler, because the same code can mean something different on another model. The fault code table in the installation manual is the one to trust.

Boiler cover options

Avoid the next call-out bill

Monthly cover means no unexpected bills when your boiler breaks down.

Approved partner

Domestic Appliance Guard

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

Get a quote →

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