BoilerFaultCodesWorcester Bosch 202 O Fault Code
Also written as 202O — same fault.
The Worcester Bosch 202 O fault code means: your boiler is taking a short, programmed break to prevent itself from turning on and off too frequently, which helps protect the internal components and improve efficiency.. It appears on 10 Worcester Bosch models in our database.
Technical description: Boiler in anti-cycle mode
What causes the Worcester Bosch 202 O fault?
This occurs when your boiler has reached its target temperature and shuts down briefly to prevent 'short-cycling,' which is when the unit turns on and off too rapidly. It happens because the heat produced by the boiler is being generated faster than your radiators can release it into your rooms. By pausing for a few minutes, the boiler protects its internal components from unnecessary wear and tear while waiting for the system water to cool down.
This status is more common during autumn and spring when your heating is on but the outside temperature is mild, meaning your home requires less heat than the boiler’s minimum output.
DIY fix possible
Wait 15 to 30 minutes for the timer to finish automaticallyEnsure all radiator valves are fully open to allow heat to dissipateCheck that your room thermostat is set higher than the current room temperature
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Gas Safe Register →Worcester Bosch models that show the 202 O fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 202 O 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