A10
Beretta
Flue Gas Sensor Fault / Flue NTC Error
Boiler shows A10, no heating or hot water, fan may run briefly then stop.
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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
Open circuit or shorted flue NTC sensor, Damaged wiring harness to flue sensor, Faulty main PCB analogue input
How to Fix / Troubleshooting
Safety: Isolate electrical power before accessing internal components.
- Power cycle: Turn the boiler off at the mains for 30 seconds, then back on to see if the fault clears temporarily.
- Technician – inspect flue NTC: Locate the flue gas temperature sensor on the Beretta boiler. Check for secure connection and visible damage.
- Measure resistance: With the boiler cold, measure the NTC resistance and compare to Beretta's temperature-resistance chart. Replace if out of range.
- Check wiring: Inspect the cable from the flue NTC to the PCB for cuts, burns, or loose plugs. Repair or replace as needed.
- PCB diagnosis: If sensor and wiring are correct, the main PCB may be faulty and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Flue NTC Sensor
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