A11
Ferroli
Fan / Air Pressure Switch Fault
Ferroli furnace displays A11 and does not start; fan may not run.
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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
Failed Ferroli fan motor, Blocked air pressure switch tubing, Faulty air pressure switch, Blocked flue or air intake
How to Fix / Troubleshooting
Safety: Turn off power and gas. Fan and flue safety circuits are critical to safe operation; improper repair can cause carbon monoxide hazards.
Steps:
- Check flue terminal: From outside, ensure the Ferroli flue is clear of obstructions.
- Listen for fan: On a call for heat, the fan should start. If silent, the fan or its power supply may be faulty.
- Inspect pressure tubes (qualified persons): With power off, remove the front cover and check the silicone tubes from the fan/venturi to the air pressure switch. Ensure they are not split, kinked, or blocked with condensate.
- Reset: After reassembly, restore power and reset the unit.
Professional help: Fan replacement, pressure switch testing, and flue integrity checks must be done by a licensed technician.
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Repair Difficulty
Professional Required
5/5
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