F0 338 High

Worcester Bosch F0 338 Fault Code

Also written as F0338 — same fault.

The Worcester Bosch F0 338 fault code means: your boiler is repeatedly trying to start but failing because it cannot sense the water flowing through the system properly.. It appears on 1 Worcester Bosch model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Too many short burner starts without confirmation - There is an error where the pump is not detecting water.
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 F0 338 fault code

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

Source

Worcester Bosch F0 338 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