Display shows A10, return temperature sensor fault, boiler stops

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

Defective NTC return sensor, Poor contact to return pipe, Damaged wiring harness, Control board failure

Safety: Turn off power and let the return pipe cool.

1. Locate return sensor: The return NTC on Brötje units is typically clipped to the return pipe entering the heat exchanger.
2. Check attachment: Ensure the sensor is properly clipped and insulated from ambient air.
3. Inspect wiring: Look for mechanical damage, pulled cables, or loose plugs at the PCB.
4. Measure resistance: Compare measured resistance to the Brötje NTC curve. Replace the return temperature sensor if out of tolerance.

Medium 3/5

Return Temperature Sensor (NTC)

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