Worcester Bosch · Greenstar 4000 Combi
259 boiler fault code
Greenstar 4000 Combi (GR4700iW C)
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What 259 means
The official Greenstar 4000 Combi manual includes code 259 in its operating/fault code table on printed page 73. The manufacturer table linked below gives the display text and fault category.
Safe check
Make a note of the displayed code. Do not remove the boiler casing or inspect internal gas, electrical or combustion components.
When to contact an engineer
Use only the homeowner action in your product guide. If this fault or maintenance message remains or returns, contact Worcester Bosch or a Gas Safe registered engineer.
Safety notice
A boiler fault code alone is not a gas or carbon-monoxide emergency. 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.
Source and provenance
- Greenstar 4000 Combi Installation Manual · 6 720 891 161 · §10.1.2 Operating/Fault code table, code 259, printed p. 73
installation and maintenance instructions
2021/10 · listed for appliances manufactured from 01/10/2023 onwards