How much does it cost to fix Worcester Bosch error code 348 EE?

Typical repair cost for the Worcester Bosch 348 EE fault is £150-300 including labour.

348 EE High

Worcester Bosch 348 EE Fault Code

Q: What does the Worcester Bosch 348 EE fault code mean?

Your boiler has detected that the water inside the system is getting much hotter than it should be, so it has shut down to prevent damage or overheating.

Also written as 348EE — same fault.

The Worcester Bosch 348 EE fault code means: your boiler has detected that the water inside the system is getting much hotter than it should be, so it has shut down to prevent damage or overheating.. It appears on 2 Worcester Bosch models in our database.

Technical description: HW: supply temperature too hot

Typical repair cost £150-300 (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 348 EE fault code

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

Source

Worcester Bosch 348 EE 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