BoilerFaultCodesWorcester Bosch Fault 56 / 147 Fault Code
Also written as FAULT56147 — same fault.
The Worcester Bosch Fault 56 / 147 fault code means: your boiler's internal pump settings have been switched to a manual override mode, preventing it from operating automatically as it should.. It appears on 2 Worcester Bosch models in our database.
Technical description: At least one pump/valve in manual mode: Pump (SP) in manual mode.
What causes the Worcester Bosch Fault 56 / 147 fault?
This fault occurs when the boiler's internal software settings have been accidentally changed to an 'installer-only' manual test mode. Instead of the boiler controlling the pump automatically based on heat demand, it is stuck in a fixed state that prevents normal operation. This is usually caused by a technician forgetting to exit a service menu or a software glitch following a power surge.
DIY fix possible
Press the Reset button for 5 seconds to clear the fault.Access the boiler menu settings if you are comfortable following the user manual instructions for 'Service Level' pump settings.Ensure any internal dials or service switches are set back to 'Auto' or 'Normal'.
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Gas Safe Register →Worcester Bosch models that show the Fault 56 / 147 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Fault 56 / 147 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