A15
De Dietrich NTC Sensor Fault – Flow Temperature

Boiler displays A15, no heating, pump may run continuously

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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 short-circuited flow NTC sensor, damaged sensor wiring, poor connector contact on PCB

How to Fix / Troubleshooting

Safety: Isolate power before accessing sensors and wiring.

  • Visual inspection: Locate the flow NTC sensor on the flow pipe or heat exchanger. Check for damaged cables or loose connectors.
  • Reseat connector: Unplug and replug the sensor connector on the PCB to ensure good contact.
  • Technician tasks: A professional should measure the resistance of the NTC at known temperatures and compare with De Dietrich specifications. Replace the sensor if out of range.
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Repair Difficulty

Medium 3/5

Required Part

Flow NTC Temperature Sensor
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