Fault 14 / 117 Medium

Worcester Bosch Fault 14 / 117 Fault Code

Also written as FAULT14117 — same fault.

The Worcester Bosch Fault 14 / 117 fault code means: your boiler is having trouble communicating with an external control or thermostat that isn't compatible with it.. It appears on 1 Worcester Bosch model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: System configuration: incompatible BUS device. DHW controlled by boiler. IPM control of DHW has no effect.

What causes the Worcester Bosch Fault 14 / 117 fault?

This fault occurs when an external thermostat or control unit is trying to talk to the boiler using a language it doesn't understand. It is usually triggered by the installation of an incompatible third-party smart control or a wiring error that disrupts the communication link between the boiler and the wall programmer. The system stops because it cannot receive clear instructions on when to turn the heating or hot water on.

Typical repair cost £80-200 (including labour)

DIY fix possible

Locate your external thermostat or heating controlsCheck if any new smart home devices or controls were recently installedTry resetting the boiler using the 'Reset' button on the front panel

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Worcester Bosch models that show the Fault 14 / 117 fault code

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

Source

Worcester Bosch Fault 14 / 117 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