Ariston Washer Error Code F18

F18 on an Ariston washer indicates a communications error involving the 3-phase motor system. The control electronics have lost reliable communication with the motor circuit, causing the machine to stop. This is most commonly traced to the main power board, which is the recommended first component to replace during diagnosis.

No, you should not continue using the washer while F18 is active. The machine has stopped because it cannot reliably communicate with and control the motor. Running a wash cycle without proper motor control could cause further damage to the motor, control boards, or other components.

A reset may temporarily clear the F18 code, but the error will return if the underlying hardware fault is not resolved. Because F18 points to a component-level communications failure, specifically involving the power board, a reset alone is not a fix. Proper diagnosis and repair of the faulty component is necessary to permanently resolve the fault.

DIY repair of F18 is possible for those with appliance repair experience, but it involves working with the main power board and motor wiring, which requires comfort with electrical components. The first diagnostic step is replacing the power board. If you are not experienced with appliance electronics, a qualified technician is the safer option.

Repair costs vary depending on which component is at fault and local labor rates. Power board replacement parts alone typically range from $80 to $200 or more, and professional labor can add $100 to $250 on top of parts. If the motor or inverter board also requires replacement, total costs will be higher.