BoilerFaultCodesWorcester Bosch Fault 13 / 159 Fault Code
Also written as FAULT13159 — same fault.
The Worcester Bosch Fault 13 / 159 fault code means: your boiler's computer is confused because it has detected a change in its connected control components and needs to be told how to work with them again.. It appears on 1 Worcester Bosch model in our database.
Technical description: System configuration: BUS device changed or replaced. Check system configuration for heating circuit!
What causes the Worcester Bosch Fault 13 / 159 fault?
This fault occurs when the boiler's main control board loses communication with a connected component, such as a smart thermostat or a plug-in wiring module. It most commonly happens after a power cut, a surge, or when a new control device has been installed but hasn't been properly synced with the system. Essentially, the boiler has detected a change in its electronic 'nervous system' and has shut down as a safety precaution until the configuration is confirmed.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the Fault 13 / 159 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Fault 13 / 159 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