A17
Beretta
Flow Switch / Circulation Fault
Display shows A17, furnace may run at reduced output or shut down
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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
Stuck or blocked flow switch, Air lock in circulation pump, Faulty circulation pump, Dirty system water restricting flow
How to Fix / Troubleshooting
Safety: Isolate power. Allow system to cool before opening any water components.
- Check circulation pump: Listen for the pump running when there is a heat demand. If silent, the pump may be seized or not powered.
- Bleed pump: Some Beretta pumps have a bleed screw on the front. Place a cloth underneath, loosen the screw slightly to release air until water appears, then retighten.
- Inspect flow switch: Locate the flow switch on the hydraulic group. Check for debris in the housing if accessible and ensure the wiring is intact.
Persistent A17 faults require a technician to test pump performance and possibly flush the system.
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Repair Difficulty
Hard
4/5
Required Part
Circulation Pump
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