Bosch DHW NTC Fault

Boiler indicates a DHW temperature sensor fault; hot water may be disabled or unstable.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Open or shorted DHW NTC, Scale build‑up affecting sensor reading, Damaged DHW sensor wiring, PCB sensor input fault

Safety: Isolate power and water supply if removing any wet components.

Steps:

Check the DHW NTC is firmly inserted into its pocket on the plate heat exchanger or outlet pipe.
Inspect wiring and reseat connectors.
Test resistance and replace the NTC if readings are incorrect.

Further faults after sensor replacement require PCB diagnosis by a professional.

Medium 3/5

DHW NTC Temperature Sensor

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