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Bosch Flow NTC Fault

Boiler indicates a flow temperature sensor fault; heating may not operate correctly.

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Safety Warning

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.

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Possible Causes

Open or shorted flow NTC, Poor contact with flow pipe, Wiring damage, PCB sensor input fault

How to Fix / Troubleshooting

Safety: Turn off power and allow the boiler to cool.

Steps:

  • Locate the flow NTC on the flow pipe and ensure it is firmly attached.
  • Inspect the cable for damage and reseat the connector at the PCB.
  • Measure resistance and replace the NTC if out of specification.

If replacing the sensor does not clear the fault, a professional should test and possibly replace the PCB.

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Repair Difficulty

Medium 3/5

Required Part

Flow NTC Temperature Sensor
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