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Worcester Bosch Fault Codes

Browse Worcester Bosch boiler fault codes with a cautious focus on safe user checks and engineer escalation. Use this hub to move into the right appliance section, then open the exact code page for the documented meaning, evidence limits and safe next steps.

Definitions can vary by model and region. Some codes remain unconfirmed; check the complete display, exact model and the page's sources before taking action.

Appliance hubs

Fault code pages

Guides linked in

Appliance types

boiler

Browse 26 Worcester Bosch boiler fault code pages.

Appliance codes across brands

Boiler codes across brands

Compare Worcester Bosch boiler pages with other brands in the same appliance category.

Selected code pages

Ignition or flame-monitoring fault; cause code required. Applies only within the model and regional limits on the code page.

Fan speed too high (215) or too low (216). Applies only within the model and regional limits on the code page.

Code categories in this library

Counts refer to published code pages, not how often an appliance develops a fault.

operating status (6)

sensor (4)

unconfirmed (4)

overheat (3)

circulation (2)

ignition (2)

More code pages

110 for Boiler

Meaning unconfirmed; exact model documentation is required

200 for Boiler

Heating mode

201 for Boiler

Hot-water mode

202 for Boiler

Anti-cycle mode

204 for Boiler

Boiler water above the target temperature

208 for Boiler

Chimney-sweep demand

268 for Boiler

Relay test activated

101 for Boiler

Collector T1 sensor lead short circuit with controller Fault 40

102 for Boiler

Collector T1 sensor lead break with controller Fault 40

104 for Boiler

Solar-cylinder T2 sensor lead break with controller Fault 41

224 for Boiler

Flue-gas or heat-exchanger temperature limiter activated

227 for Boiler

No flame signal after ignition