F43
Ferroli Circulation Fault / Pump Blocked

Boiler shows F43; often indicates a circulation or pump fault on some Ferroli models.

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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

Seized pump, Blocked heat exchanger, Airlock, Sludge in system

How to Fix / Troubleshooting

Safety first: Isolate power and allow boiler to cool.

  • User actions: Check pressure and bleed radiators to remove air.
  • Engineer checks:
    • Inspect and free or replace the pump.
    • Check and clean the primary heat exchanger.
    • Flush the system and add inhibitor to remove sludge.
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Repair Difficulty

Hard 4/5

Required Part

Primary Circulation Pump
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