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 10 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.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Worcester Bosch models that show the 1018 fault code
Click a model for the full fault code list and model-specific repair notes.
- 1000 Repair: £90-130
- Greenstar 2000 Repair: £90-140
- Greenstar 27CDi Repair: £90-140
- Greenstar 28CDi Repair: £90-140
- Greenstar 4000 Repair: £90-140
- Greenstar 8000 Repair: £90-140
- Greenstar 8000 Life Repair: £90-140
- Greenstar 8000 Life System Repair: £90-140
- Greenstar 8000 Life/Style Repair: £80-120
- Greenstar 8000 Style Repair: £90-140
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.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026