BoilerFaultCodesWorcester Bosch EE5 Fault Code
The Worcester Bosch EE5 fault code means: your boiler's gas valve is not opening or functioning correctly, preventing the system from producing heat or hot water.. It appears on 1 Worcester Bosch model in our database.
Technical description: Main valve
What causes the Worcester Bosch EE5 fault?
This fault occurs when the boiler's control system attempts to ignite the burner but detects that the gas valve has failed to open. The most common reason is an electrical failure within the valve's internal motor or a communication error from the main circuit board that prevents the flow of gas.
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 EE5 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch EE5 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