A19
Beretta
Internal Overtemperature / Limit Fault
A19 displayed; unit may lock out during operation
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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
Blocked primary heat exchanger, Pump failure, Incorrect system pressure, Faulty internal temperature sensor
How to Fix / Troubleshooting
Safety: Allow the heater to cool fully. Do not operate if overheating recurs.
- 1. Check system pressure (if applicable): On boiler-type water heaters, verify that the pressure gauge shows the correct cold pressure (typically around 1–1.5 bar). Top up if low, following the manual.
- 2. Ensure all valves are open: Confirm that isolation valves on the heating circuit are not closed.
- 3. Listen for pump operation: When there is demand, the pump should run smoothly. If silent or noisy, it may be seized or air-locked.
- 4. Technician flushing: A professional can flush or chemically clean the primary heat exchanger to restore flow.
- 5. Sensor check: Test the internal temperature sensor for correct resistance and replace if faulty.
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Repair Difficulty
Hard
4/5
Required Part
Circulation pump
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