BoilerFaultCodesWorcester Bosch Steady light Fault Code
Also written as STEADYLIGHT — same fault.
The Worcester Bosch Steady light fault code means: your boiler has switched itself off because it has become too hot to operate safely.. It appears on 2 Worcester Bosch models in our database.
Technical description: Overheat
What causes the Worcester Bosch Steady light fault?
This fault occurs when the water inside the heat exchanger reaches a dangerously high temperature, triggering a safety shut-off to prevent damage. The most common reasons include a failing pump that isn't moving water away fast enough, or a buildup of debris and sludge that is restricting the flow through the system.
This issue is more frequent during the first cold spell of autumn when the heating is turned on after a long summer break, as internal parts like the pump can seize from lack of use.
DIY fix possible
Check that your radiator valves are open to allow water to flow.Wait for the boiler to cool down completely.Press the reset button once to see if the system restarts.
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Gas Safe Register →Worcester Bosch models that show the Steady light fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Steady light 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