A11
Fondital
Return NTC Sensor Fault
Display shows A11, unit may run only in limited mode or not at all.
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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 temperature sensor, Loose or corroded connector, Damaged wiring harness, Control board fault
How to Fix / Troubleshooting
Safety: Disconnect power before working inside the appliance.
- Locate return NTC: Identify the sensor on the return pipe entering the Fondital heat exchanger.
- Check plug and wiring: Reseat the connector and inspect for moisture or corrosion. Dry and clean if necessary.
- Compare temperatures: If the display shows unrealistic return temperatures compared to actual pipe temperature, the sensor is likely faulty and should be replaced.
- Harness continuity: A technician can check continuity from the sensor to the control board. Replace the harness if open or shorted.
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Repair Difficulty
Medium
3/5
Required Part
Return NTC Temperature Sensor
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