F18
Hotpoint-Ariston
Main Processor / Communication Error
Dryer may freeze, not respond to commands, or reboot; F18 displayed indicating communication or processor error.
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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
Microcontroller fault on main PCB, Severe electrical noise or surge, Internal communication bus failure, Corrupted firmware
How to Fix / Troubleshooting
Safety first: Unplug the dryer before any disassembly.
- Power cycle: Disconnect power for 20 minutes to fully reset the control electronics. Reconnect and test.
- Check for external interference: Avoid sharing the outlet with heavy inductive loads (e.g., welders, compressors) that can introduce electrical noise.
- Inspect PCB: Remove the main control board and check for obvious damage, cracked solder joints, or burnt components. If present, replace the board.
- Board replacement: Persistent F18 usually requires replacement of the main control board with a correctly programmed Hotpoint-Ariston module.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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