BoilerFaultCodesWorcester Bosch P6 Fault Code
The Worcester Bosch P6 fault code means: your boiler is simply performing a routine internal check as it starts up and the code should disappear after a few seconds.. It appears on 2 Worcester Bosch models in our database.
Technical description: Part of the self-test sequence sequence when the appliance is switched on.
What causes the Worcester Bosch P6 fault?
This code appears when the boiler is first powered on or restarted, serving as a sign that the internal control board is running a diagnostic check. It occurs as the software verifies that all safety sensors and electronic components are communicating correctly before allowing the burner to light. It is not a malfunction, but rather a necessary step in the appliance's normal startup routine.
DIY fix possible
Wait for 30-60 seconds to see if the code clears automaticallyEnsure the power supply to the boiler is stableReset the boiler if the code remains on the screen for more than 2 minutes
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Gas Safe Register →Worcester Bosch models that show the P6 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch P6 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