Machine freezes mid-cycle or behaves unpredictably; F18 displayed on some models.

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.

Possible Causes

Internal microcontroller fault, noise on communication bus, power surge damage, defective main control board

Safety: Disconnect power.

Actions:

Power cycle: Unplug for 15–20 minutes, then reconnect and try a short cycle.
Check mains quality: Ensure the outlet is properly grounded and not shared with heavy inductive loads that cause spikes.
Inspect board: Look for obvious damage, corrosion, or insect infestation on the PCB.
Replace board: If F18 recurs consistently, the main control board is likely defective and must be replaced.

Note: Some F18 issues can be intermittent; document when they occur to help a technician diagnose.

Professional Required 5/5

Main Control Board (Power Module)

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