A16
De Dietrich NTC Sensor Fault – DHW Temperature

Boiler shows A16, DHW temperature unstable or no hot water

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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

Faulty DHW NTC sensor, wiring fault, sensor not properly clipped to pipe or cylinder

How to Fix / Troubleshooting

Safety: Turn off power and close water valves if removing sensors from wet parts.

  • Check sensor position: Ensure the DHW NTC sensor is firmly attached to the DHW outlet pipe or cylinder pocket as designed.
  • Inspect wiring: Look for damage or loose connectors between the sensor and PCB.
  • Technician tasks: Measure sensor resistance and replace if faulty. Recalibrate DHW temperature settings if required.
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Repair Difficulty

Medium 3/5

Required Part

DHW NTC Temperature Sensor
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