BoilerFaultCodesWorcester Bosch Fault 19 / 202 Fault Code
Also written as FAULT19202 — same fault.
The Worcester Bosch Fault 19 / 202 fault code means: your boiler's internal computer is trying to communicate with a part or an external controller that it can no longer find or recognize.. It appears on 1 Worcester Bosch model in our database.
Technical description: Unable to save parameter settings: BUS device is configured but not available at present.
What causes the Worcester Bosch Fault 19 / 202 fault?
This fault occurs when the boiler's main control board loses its digital connection with internal components or external thermostats. It is typically caused by a loose wiring connection, a malfunctioning plug-in radio frequency receiver, or a failing memory chip on the central circuit board. Essentially, the boiler has become 'confused' because it is looking for a device that is no longer responding to its signals.
DIY fix possible
Press the Reset button for five seconds and wait for the boiler to restartCheck that any external thermostats or internet hubs are powered on and connectedCheck for any loose batteries in your wireless room thermostat
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Gas Safe Register →Worcester Bosch models that show the Fault 19 / 202 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Fault 19 / 202 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