2.7A Medium

Worcester Bosch 2.7A Fault Code

Also written as 27A — same fault.

The Worcester Bosch 2.7A fault code means: your boiler's blue light is displaying a status code that indicates a mismatch or error in your boiler's internal configuration settings.. 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: Demand/fault LED (blue light) activation - O = The blue light will only operate as a flashing fault alert; 1 = The blue light will operate as a boiler operation and fault alert.
Typical repair cost £120-200 (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 2.7A fault code

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

Source

Worcester Bosch 2.7A 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