Fault 13 / 158 High

Worcester Bosch Fault 13 / 158 Fault Code

Also written as FAULT13158 — same fault.

The Worcester Bosch Fault 13 / 158 fault code means: your boiler's computer is confused because it thinks a new component has been plugged in or a setting has changed, and it needs to be told how to work with the updated system.. It appears on 1 Worcester Bosch model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: System configuration: BUS device changed or replaced. Check system configuration for heating circuit!

What causes the Worcester Bosch Fault 13 / 158 fault?

This fault occurs when the boiler's main control board loses its connection with a key component or detects that a new part has been installed without being properly synced. The most common reason is a communication error between the boiler and a smart thermostat, or a hardware glitch that happens after a power surge or a recent repair where settings weren't fully saved.

Typical repair cost £80-160 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the Fault 13 / 158 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch Fault 13 / 158 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