A06
Beretta
Domestic Hot Water NTC Sensor Fault / DHW Temperature Control Error
Boiler intermittently locks out with A06, especially during hot water demand, water temperature fluctuates.
Advertisements
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.
Advertisements
Possible Causes
Faulty DHW NTC sensor, Loose or corroded NTC wiring harness, Scaled plate heat exchanger causing rapid temperature swings, Faulty PCB temperature processing circuit
How to Fix / Troubleshooting
Safety: Isolate power before removing the boiler front cover. Water circuits may be hot.
- Check DHW temperature setting: Ensure the hot water temperature is not set excessively high, which can exaggerate fluctuations.
- Run hot water test: Open a hot tap fully and observe temperature stability. Note if A06 appears only at low or high flow rates.
- Technician – inspect DHW NTC: Locate the DHW NTC sensor on the Beretta plate heat exchanger or DHW outlet. Check for secure connection and measure resistance. Replace if faulty.
- Technician – descale plate heat exchanger: If hot water pulses between hot and cold, remove and chemically descale or replace the plate heat exchanger.
- Check wiring harness: Inspect NTC wiring for damage or loose plugs at the PCB. Repair or replace harness as needed.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
DHW NTC Sensor
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements