BoilerFaultCodesWorcester Bosch E00-720 Fault Code
Also written as E00720 — same fault.
The Worcester Bosch E00-720 fault code means: your boiler has detected a fault with the burner unit, meaning it cannot safely ignite or maintain a flame to provide heat or hot water.. It appears on 1 Worcester Bosch model in our database.
Technical description: Burner – Natural Gas Aeromatic, Ref. AACC 2233//0055 33558842
What causes the Worcester Bosch E00-720 fault?
This fault occurs when the boiler's internal computer detects that the burner is not firing correctly or the flame signal is too weak to operate safely. It is usually caused by a failure in the gas delivery system or worn-out ignition components that can no longer create a spark. Over time, carbon buildup on the burner or a faulty gas valve prevents the steady flow of fuel needed to maintain heat.
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 E00-720 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch E00-720 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