Worcester Bosch · Greenstar 4000 Combi
238 boiler fault code
Greenstar 4000 Combi (GR4700iW C)
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What 238 means
238 indicates that the boiler electronics are faulty.
Safe check
Record the exact display message and keep the boiler switched off if the fault remains. Do not open the boiler or attempt an internal electrical check.
When to contact an engineer
The code is displayed or returns; arrange a Gas Safe registered engineer to investigate the boiler electronics.
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, printed p. 73 · code 238
installation and maintenance instructions
2021/10 · 6 720 891 161