BoilerFaultCodesWorcester Bosch 8.E Fault Code
Also written as 8E — same fault.
The Worcester Bosch 8.E fault code means: your boiler's internal memory has encountered an error and has reverted to its factory default settings, meaning it needs reconfiguring to work with your heating system.. It appears on 1 Worcester Bosch model in our database.
Technical description: Reset all parameters
What causes the Worcester Bosch 8.E fault?
This fault occurs when the boiler's internal computer suffers a data corruption or a temporary power fluctuation that wipes its stored memory. Effectively, the boiler has forgotten how to communicate with your specific heating setup and has reverted to its original factory settings for safety. The most common reason is a failing primary circuit board or a loose connection with the small 'code plug' that stores the unit's identity.
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 8.E fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 8.E 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