Worcester Bosch · Greenstar 2000 Combi

256 boiler fault code

Greenstar 2000 Combi

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What 256 means

System fault in the boiler electronics / basic controller.

Gas Safe engineer: Contact a Gas Safe registered engineer to investigate this fault.

If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.

Renting? Report it to your landlord or housing provider first. They are responsible for gas safety and boiler repairs, and the repair should not cost you.

Safe check

Note the displayed code and contact a Gas Safe registered engineer.

When to contact an engineer

Contact a Gas Safe registered engineer to investigate this fault.

Source and provenance

Worcester Bosch Greenstar 2000 Installation, Commissioning and Servicing Instructions (2023/06) - 11.2, code 256, printed p. 81 - document 6721839340
installation, commissioning and servicing instructions
2023/06 - document 6721839340