A08
Ferroli Return Temperature Sensor (NTC) Fault

Boiler shows A08; may relate to return temperature sensor issues or inconsistent temperature readings.

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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 return NTC sensor, Loose or corroded NTC connector, Damaged wiring harness, PCB sensor circuit fault

How to Fix / Troubleshooting

Safety first: Turn off power and allow the boiler to cool before accessing internal components.

  • Reset once: Perform a reset. If A08 reappears, a hardware fault is likely.
  • Engineer checks:
    • Test the return NTC resistance and compare to the temperature/resistance chart.
    • Inspect wiring from NTC to PCB for continuity and insulation damage.
    • Replace the return NTC sensor if defective.
    • Check PCB for dry joints or damage on the sensor input; replace PCB if required.
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Repair Difficulty

Hard 4/5

Required Part

Return NTC Temperature Sensor
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