F20
Ferroli Internal Overtemperature / Safety Cut-out

Display shows F20; unit may shut down unexpectedly 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 on Ferroli unit, Insufficient water flow due to pump or valve issues, Faulty temperature sensor or overheat stat

How to Fix / Troubleshooting

Safety: Allow the unit to cool fully before touching any internal components. Overheating can damage parts and pose burn risks.

Steps:

  • Check system pressure and flow: Ensure correct pressure, bleed air, and verify that all valves are open.
  • Inspect pump: Confirm the Ferroli pump is running and not excessively noisy or hot.
  • Clean filters/strainers: If fitted, clean any system strainers or magnetic filters to restore flow.
  • Reset: Use the reset function after correcting flow issues.

Professional help: A technician may need to chemically flush or replace a scaled heat exchanger and test/replace the overheat stat.

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Repair Difficulty

Hard 4/5

Required Part

Primary Heat Exchanger
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