BoilerFaultCodesWorcester Bosch CC Fault Code
The Worcester Bosch CC fault code means: your boiler has lost connection to the weather sensor outside, but it should still continue to keep your home warm using its backup settings.. It appears on 12 Worcester Bosch models in our database.
Technical description: Outdoor sensor defect
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 CC fault code
Click a model for the full fault code list and model-specific repair notes.
- 533 Compact
- 535 Compact
- Bosch Greenstar ZWBR 7-25A
- Greenstar 24
- Greenstar 25 Si Compact Repair: £90-180
- Greenstar 25Si Compact ErP Repair: £90-180
- Greenstar 27i System Compact ErP Repair: £90-180
- Greenstar 28
- Greenstar 30 Si Compact Repair: £90-180
- Greenstar 30i System Compact ErP Repair: £90-180
- Greenstar 30Si Compact ErP Repair: £90-180
- ZB 7 27 HE Repair: £150-£350
Source
Worcester Bosch CC 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 535 Compact manual (PDF)
- Worcester Bosch Bosch Greenstar ZWBR 7-25A manual (PDF)
- Worcester Bosch Greenstar 28 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026