How much does it cost to fix Worcester Bosch error code 1-E2?

Typical repair cost for the Worcester Bosch 1-E2 fault is £90-250 including labour.

1-E2 High

Worcester Bosch 1-E2 Fault Code

Q: What does the Worcester Bosch 1-E2 fault code mean?

Your boiler's internal computer is reporting an issue with its software version, which may lead to communication problems between the controls and the boiler.

Also written as 1E2 — same fault.

The Worcester Bosch 1-E2 fault code means: your boiler's internal computer is reporting an issue with its software version, which may lead to communication problems between the controls and the boiler.. It appears on 3 Worcester Bosch models in our database.

Technical description: Programmer unit version: Software version of the programmer.

What causes the Worcester Bosch 1-E2 fault?

This fault occurs when there is a software mismatch or a data corruption issue between the boiler's internal computer and the display unit. It typically happens because the two components are unable to 'talk' to each other correctly due to a failing circuit board or a loose communication cable. Effectively, the boiler recognizes that the software version installed isn't compatible with the hardware it is trying to control.

Typical repair cost £90-250 (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 1-E2 fault code

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

Source

Worcester Bosch 1-E2 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