BoilerFaultCodesWorcester Bosch E9219 Fault Code
The Worcester Bosch E9219 fault code means: your boiler has reached an unsafe temperature and has automatically shut down to prevent damage or overheating.. It appears on 2 Worcester Bosch models in our database.
Technical description: The safety temperature sensor has captured a temperature in excess of 105°C
What causes the Worcester Bosch E9219 fault?
This fault occurs when the water inside the boiler gets too hot too quickly, causing the safety system to shut everything down to prevent damage. The most common reasons are a pump failure that stops water from moving or a blockage in the heat exchanger that traps heat inside the unit. It can also be caused by air trapped in the system or a build-up of sludge restricting the flow.
This fault is often seen when the heating is first turned back on in autumn, as circulation pumps can seize up after being idle throughout the summer.
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 E9219 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch E9219 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