FAIL POINT F High

Worcester Bosch FAIL POINT F Fault Code

Also written as FAILPOINTF — same fault.

The Worcester Bosch FAIL POINT F fault code means: your boiler is trying to run the heating even though you have turned the control knob to the off position, which usually indicates an internal electronic fault or a stuck component.. It appears on 4 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: Light on constant (CH knob in OFF position) - likely caused by Autofrost stat mode or wet board

What causes the Worcester Bosch FAIL POINT F fault?

This fault occurs when the boiler's internal computer wrongly detects a demand for central heating even though you have turned the dial to the off position. The most common reason is an electrical short or failure within the main control board, which causes the system to run uncontrollably. In some cases, a mechanical part like the diverter valve can get stuck, sending confusing signals to the electronics.

Typical repair cost £180-£450 (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 FAIL POINT F fault code

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

Source

Worcester Bosch FAIL POINT F 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