BoilerFaultCodesWorcester Bosch FAIL POINT K Fault Code
Also written as FAILPOINTK — same fault.
The Worcester Bosch FAIL POINT K fault code means: your boiler's main internal computer has developed a serious communication error and cannot operate, often because it has been exposed to water or has suffered an electrical failure.. It appears on 5 Worcester Bosch models in our database.
Technical description: Gas valve mode switch not set to 'NORM' or water temperature low/gas pressure issues.
What causes the Worcester Bosch FAIL POINT K fault?
This fault occurs when the boiler's main control board suffers a critical internal failure and can no longer process data to operate the system. The most common cause is water ingress from a leaking internal component dripping onto the electronics, or a power surge that has damaged the sensitive electrical tracks on the board.
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 K fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch FAIL POINT K fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
- Worcester Bosch 24/28CDi II RSF manual (PDF)
- Worcester Bosch 28 i SI manual (PDF)
- Worcester Bosch 28 Si RSF manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026