BoilerFaultCodesWorcester Bosch SE Fault Code
The Worcester Bosch SE fault code means: your boiler is simply displaying a reminder that its annual service is due soon or is now overdue.. It appears on 1 Worcester Bosch model in our database.
Technical description: Service interval expired
What causes the Worcester Bosch SE fault?
This code appears because a service timer has been programmed into the boiler's internal computer by a previous engineer. It is triggered once a set period of time—usually twelve months—has passed since the last professional maintenance visit. It is not a hardware failure, but rather an automated prompt to ensure the appliance remains safe and efficient.
This code often appears in autumn as homeowners turn their heating back on and realise a year has passed since their last pre-winter check.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the SE fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch SE 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