BoilerFaultCodesWorcester Bosch Flow NTC sensor defective Fault Code
Also written as FLOWNTCSENSORDEFECTIVE — same fault.
The Worcester Bosch Flow NTC sensor defective fault code means: your boiler's temperature gauge is faulty, meaning it cannot correctly measure how hot the water is and has stopped working to prevent potential overheating.. It appears on 1 Worcester Bosch model in our database.
Technical description: Flow NTC sensor defective. Check flow NTC sensor and connecting lead.
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 Flow NTC sensor defective fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Flow NTC sensor defective 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 7 July 2026