A41
Ferroli
Flow/Return NTC Mismatch or Calibration Error
Display shows A41; unit may not respond correctly to temperature changes.
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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
One of the Ferroli NTC sensors out of tolerance, Poor hydraulic circulation causing abnormal temperature differential, Control board calibration fault
How to Fix / Troubleshooting
Safety: Turn off power before touching sensors or wiring.
Steps:
- Bleed system: Remove air from radiators and high points to ensure proper circulation.
- Check pump operation: Confirm the Ferroli circulation pump runs smoothly and valves are open.
- Inspect NTCs: Ensure both flow and return NTCs are firmly attached to their pipes and properly insulated from ambient air.
- Reset: Power-cycle the unit and reset the error.
Professional help: A technician should compare NTC readings and replace any sensor or the control board if readings are inconsistent.
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Repair Difficulty
Medium
3/5
Required Part
Flow and Return NTC Sensors
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