289 / CF High

Worcester Bosch 289 / CF Fault Code

Also written as 289CF — same fault.

The Worcester Bosch 289 / CF fault code means: your boiler's internal sensor that detects water pressure has lost its connection or has developed a wiring fault, preventing it from knowing if the system pressure is safe to operate.. It appears on 3 Worcester Bosch models 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: Water pressure sensor not connected or short-circuit to ground
Typical repair cost £120-220 (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 289 / CF fault code

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

Source

Worcester Bosch 289 / CF 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