BoilerFaultCodesWorcester Bosch 273 Fault Code
The Worcester Bosch 273 fault code means: your boiler has paused its operation because it has been running continuously for 24 hours and needs to perform a brief internal safety check.. It appears on 8 Worcester Bosch models in our database.
Technical description: Operation of burner and fan interrupted
What causes the Worcester Bosch 273 fault?
This code occurs when the boiler has been operating for a full 24 hours without a break, usually due to a high demand for heating or a thermostat set to a very high temperature. To ensure long-term reliability and safety, the system briefly stops the burner and fan to perform a mandatory internal self-test. Once the quick diagnostic check is complete, the boiler will automatically resume normal operation.
This code is more common during extreme winter cold snaps when the heating stays on around the clock to maintain the temperature in the home.
DIY fix possible
Wait for several minutes as the boiler usually restarts itself automatically after the safety check.If the code persists, turn the power to the boiler off and back on again to reset the timer.Ensure your thermostat is not set to an unusually high temperature that prevents the boiler from ever reaching its target.
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 273 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 273 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