BoilerFaultCodesWorcester Bosch 2.4 Fault Code
Also written as 24 — same fault.
The Worcester Bosch 2.4 fault code means: your boiler is temporarily pausing its burner to prevent it from switching on and off too frequently, which protects the internal parts from unnecessary wear.. It appears on 5 Worcester Bosch models in our database.
Technical description: Anti-cycle time
What causes the Worcester Bosch 2.4 fault?
This occurs when the boiler reaches its target temperature too quickly, often because your radiators are already warm or the heating system is smaller than the boiler's output. To protect the internal components from burnout caused by constant stopping and starting, the system enforces a short rest period. It is essentially the boiler taking a 'breather' until the water temperature drops enough to start a new, efficient heating cycle.
This is more common during the spring and autumn when the weather is mild and your home requires only a small amount of heat to reach the thermostat setting.
DIY fix possible
Check that all radiator valves (TRVs) are fully open to allow heat to escape the boilerMonitor the boiler for a few minutes as it should restart automatically once the timer expiresEnsure the system pressure is between 1.0 and 1.5 bar on the front gauge
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →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 27 April 2026