601
Ariston
Fan Speed / Tachometer Fault
Boiler shows 601, fan runs continuously or not at all, no ignition
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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
Defective fan speed sensor, Fan motor failure, Blocked flue causing abnormal load, PCB fan control fault
How to Fix / Troubleshooting
Safety: Flue and fan issues are safety critical. Do not operate the boiler with a suspected fan fault.
- Listen to fan: Note whether the fan starts and stops correctly. Whining, grinding, or no operation indicates failure.
- External flue check: Ensure the flue terminal is clear of obstructions.
- Engineer diagnosis: A professional will measure fan speed feedback, check the tachometer signal, and replace the fan assembly or PCB as required.
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Repair Difficulty
Professional Required
5/5
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