BoilerFaultCodesWorcester Bosch 204 Fault Code
The Worcester Bosch 204 fault code means: your boiler has detected that the water inside the unit is getting hotter than the temperature setting, so it has purposefully turned itself off to prevent overheating.. It appears on 11 Worcester Bosch models in our database.
Technical description: Current primary water temperature higher than set val.
What causes the Worcester Bosch 204 fault?
Temperature control issue
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Worcester Bosch models that show the 204 fault code
Click a model for the full fault code list and model-specific repair notes.
- 26 CDi Xtra
- 26 CDi Xtra RSF
- Greenstar 1000 Repair: £150-300
- Greenstar 2000 Repair: £120-250
- Greenstar 27i System Compact ErP
- Greenstar 30i System Compact ErP
- Greenstar 8000 F Repair: £120-£350
- Greenstar 8000+ Repair: £120-£350
- Greenstar 8000+ Style Repair: £120-£350
- Greenstar CDi Compact
- Greenstar i Repair: £90-180
Source
Worcester Bosch 204 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
- Worcester Bosch 26 CDi Xtra RSF manual (PDF)
- Worcester Bosch Greenstar 30i System Compact ErP manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026