BoilerFaultCodesWorcester Bosch 1018 Fault Code
The Worcester Bosch 1018 fault code means: your boiler is simply reminding you that its scheduled annual service is now due to ensure it continues running safely and efficiently.. It appears on 5 Worcester Bosch models in our database.
Technical description: Maintenance interval expired
What causes the Worcester Bosch 1018 fault?
This code appears because your heating engineer set a specific time interval or operation limit during the last visit to ensure the appliance is maintained correctly. It is not a mechanical failure, but rather a built-in timer that has reached its end date to help you stay compliant with your manufacturer's warranty. Once the engineer completes the annual safety checks and cleaning, they will reset this timer to clear the message.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A cover plan would handle faults like 1018: no call-out fees, no surprise bills.
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Worcester Bosch models that show the 1018 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 1018 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 Greenstar 1000 manual (PDF)
- Worcester Bosch Greenstar 2000 manual (PDF)
- Worcester Bosch Greenstar 27CDi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026