Ferroli Control Board Standby / No Call for Heat

Water heater powers on but does not ignite, no clicking sound, no fan operation, no error code displayed.

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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

Faulty flow switch or sensor not detecting demand, Defective on/off or mode selector on Ferroli panel, Loose low-voltage wiring to sensors, PCB logic fault

How to Fix / Troubleshooting

Safety: Turn off power before removing covers.

  • 1. Confirm demand: Open a hot water tap fully. Check if any indicator on the Ferroli display shows demand (tap icon, flame icon, etc.).
  • 2. Flow sensor check: Clean and inspect the flow sensor/turbine as described earlier. If the PCB never sees flow, it will not start ignition.
  • 3. Panel buttons: Ensure the appliance is not in standby or vacation mode. Try changing modes and temperatures to wake the control.
  • 4. Wiring: Inspect low-voltage harnesses from sensors and switches to the PCB. Reseat connectors.
  • 5. PCB replacement: If all inputs are correct but the board does not initiate a start sequence, a technician may need to replace the main PCB.
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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB
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