Worcester Bosch · Greenstar 4000 Combi
224 boiler fault code
Greenstar 4000 Combi (GR4700iW C)
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What 224 means
224 indicates the maximal flue gas thermostat or heat exchanger maximal thermostat has activated.
Safe check
Record the exact display message without attempting an internal check. Keep the appliance off if the fault remains.
When to contact an engineer
The fault is displayed or returns; arrange a qualified heating engineer to investigate it.
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 224, printed p. 72
installation and maintenance instructions
2021/10 · listed for appliances manufactured from 01/10/2023 onwards