BoilerFaultCodesWorcester Bosch 2.4 Fault Code
Also written as 24 — same fault.
The Worcester Bosch 2.4 fault code means: your boiler is perfectly fine, it is simply pausing for a few minutes between heating cycles to save energy and prevent unnecessary wear.. It appears on 3 Worcester Bosch models in our database.
Technical description: Service Function: Anti-cycle time
What causes the Worcester Bosch 2.4 fault?
This code appears when the boiler has reached its target temperature and needs to wait for the radiators to dissipate heat before firing up again. It is triggered to prevent 'short-cycling,' which happens if the heating system is too small for the boiler's power or if the radiator valves have shut off. By pausing, the boiler protects its components from the mechanical stress of turning on and off too rapidly.
This display is more common in autumn and spring when the weather is mild and the heating system doesn't need to run at full capacity to keep the house warm.
DIY fix possible
Check that all radiator valves are fully open to allow heat to dissipateEnsure the room thermostat is turned up higher than the current room temperatureWait 15-20 minutes for the internal timer to reset and the boiler to restart automatically
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Worcester Bosch models that show the 2.4 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2.4 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 31 August 2026