A09
Beretta
Return Temperature NTC Sensor Fault
A09 displayed; heater may overheat or not regulate temperature correctly
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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
Failed return NTC sensor, Poor sensor contact with pipe, Wiring harness fault, Control board sensor circuit failure
How to Fix / Troubleshooting
Safety: Turn off power and allow the unit to cool before working on sensors.
- 1. Reset and monitor: Reset the heater and observe operation. If A09 reappears, the return sensor is likely faulty.
- 2. Locate return NTC: This sensor is usually on the return pipe entering the heat exchanger.
- 3. Check physical condition: Ensure the sensor is firmly attached and not corroded or wet from leaks.
- 4. Test sensor (technician): Measure resistance and compare with Beretta's NTC chart. Replace if out of tolerance.
- 5. Wiring and PCB check: If sensor tests good, a technician should check wiring continuity and the PCB input.
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Repair Difficulty
Medium
3/5
Required Part
Return NTC sensor
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