12
Biasi Flow/Return NTC Sensor Short Circuit

Error 12; display may show abnormal temperature readings or fluctuate rapidly.

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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

Shorted NTC sensor, Water ingress into sensor connector, Damaged wiring harness, Faulty PCB input

How to Fix / Troubleshooting

Safety: Isolate power before inspecting wiring or sensors.

Steps:

  • Identify which NTC: Consult the Biasi manual to determine whether error 12 refers to flow or return sensor on your model.
  • Inspect connector: Disconnect the sensor and check for moisture or corrosion. Dry thoroughly and clean contacts if needed.
  • Check cable: Look for crushed or melted insulation causing a short between the two sensor wires.
  • Test sensor: Measure resistance. A reading near 0 Ω indicates a shorted sensor; replace it.

Note: If a new sensor does not resolve the fault, the PCB may have a damaged input circuit and will need professional replacement.

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Repair Difficulty

Medium 3/5

Required Part

Flow/Return NTC Sensor
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