A08
Beretta Flow Temperature NTC Sensor Fault

A08 error; heater may run at incorrect temperature 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 flow NTC sensor, Loose sensor connection, Damaged wiring harness, Faulty main PCB

How to Fix / Troubleshooting

Safety: Isolate electrical power before removing covers.

  • 1. Reset and test: Reset the unit and run hot water. If A08 returns, the flow temperature sensor circuit is suspect.
  • 2. Locate flow NTC: The flow NTC is typically mounted on the primary flow pipe leaving the heat exchanger.
  • 3. Check mounting: Ensure the sensor is properly clipped or inserted and has good thermal contact with the pipe.
  • 4. Measure resistance (technician): Disconnect the sensor and measure resistance at room temperature. Compare with Beretta specifications. Replace if readings are abnormal.
  • 5. Inspect wiring: Look for damaged insulation, corrosion at connectors, or loose plugs between the sensor and PCB.
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Repair Difficulty

Medium 3/5

Required Part

Flow NTC sensor
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