BoilerFaultCodesWorcester Bosch FAIL POINT I Fault Code
Also written as FAILPOINTI — same fault.
The Worcester Bosch FAIL POINT I fault code means: your boiler has detected a problem with one of its internal temperature sensors and has stopped working as a safety precaution.. It appears on 4 Worcester Bosch models in our database.
Technical description: Flashing fast (Sensor Fault)
What causes the Worcester Bosch FAIL POINT I fault?
This fault occurs when the boiler's control board loses communication with the temperature sensors or receives a reading that is outside of its safe operating range. The most common reason is that the internal thermistors have physically degraded over time or a wire has shaken loose, preventing the boiler from knowing if the water is becoming dangerously hot.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the FAIL POINT I fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch FAIL POINT I 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