A13
Beretta
Primary Circuit Sensor Correlation Error
A13 displayed; heater may start but then shut down with temperature anomalies
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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
Mismatched readings between flow and return NTC sensors, Poor hydraulic circulation, Air in system, Faulty NTC sensor pair
How to Fix / Troubleshooting
Safety: Allow the unit to cool and isolate power before working on sensors or hydraulics.
- 1. Reset and observe temperatures: If the display shows diagnostic temperatures, note the flow and return values. Large, unrealistic differences can trigger A13.
- 2. Bleed air (technician-level): Air pockets in the primary circuit can cause false readings. Use bleed valves and the automatic air vent to remove air.
- 3. Check pump operation: Ensure the circulation pump runs smoothly and that there is no blockage in the primary circuit.
- 4. Test both NTCs: A technician should remove and measure both flow and return NTC sensors at the same temperature. Their resistances should be similar and within Beretta specs.
- 5. Replace sensor pair if needed: If one or both sensors are out of range, replace them as a matched pair.
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Repair Difficulty
Hard
4/5
Required Part
Flow and return NTC sensors
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