CH flow sensor fault High

Worcester Bosch CH flow sensor fault Fault Code

Also written as CHFLOWSENSORFAULT — same fault.

The Worcester Bosch CH flow sensor fault fault code means: your boiler's temperature sensor is struggling to communicate with the main control board, which is preventing your heating from operating correctly.. 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: CH flow sensor (8000 - 20000 ohms at room temperature). Wiring and connections to sensor.
Typical repair cost £90-160 (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 CH flow sensor fault fault code

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

Source

Worcester Bosch CH flow sensor fault 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