274 Medium

Worcester Bosch 274 Fault Code

The Worcester Bosch 274 fault code means: your boiler has detected that it is still sensing a flame even when it should be turned off, which can indicate a small internal electrical or sensor issue.. It appears on 2 Worcester Bosch models 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: Ionisation signal present during last 24 hours
Typical repair cost £150-250 (including labour)

Engineer required

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

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 274 fault code

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

Source

Worcester Bosch 274 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