A17
De Dietrich Return Temperature Sensor Fault

Boiler displays A17, burner stops, pump may continue to run

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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

Defective return NTC sensor, wiring damage, poor contact at PCB

How to Fix / Troubleshooting

Safety: Isolate electrical supply before working inside the boiler.

  • Locate return NTC: Find the return NTC sensor on the return pipe. Check for corrosion, moisture ingress, or loose fixing.
  • Check connector: Reseat the connector on the PCB and inspect the cable for cuts or crushing.
  • Technician tasks: Test sensor resistance and replace if out of specification.
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Repair Difficulty

Medium 3/5

Required Part

Return NTC Temperature Sensor
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