BoilerFaultCodesWorcester Bosch E00-738 Fault Code
Also written as E00738 — same fault.
The Worcester Bosch E00-738 fault code means: your boiler has detected a critical internal fault with the burner system that regulates the fuel supply, meaning the appliance cannot ignite safely.. It appears on 1 Worcester Bosch model in our database.
Technical description: Burner Injector – Propane Stereomatic, Type 7, Rs1/8 3.1mm
What causes the Worcester Bosch E00-738 fault?
This fault occurs when the boiler detects an issue with the components that deliver and ignite the gas at the burner, often due to a blockage or wear in the injector. Over time, carbon build-up or a failing gas valve can prevent the correct fuel-to-air mixture from reaching the ignition point, causing the system to shut down for safety. It essentially means the boiler can no longer guarantee a stable and controlled flame.
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 E00-738 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch E00-738 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