The speed controller is stepless and is controlled via a potentiometer to the PCB.

If the speed controller falters, it is possible that the potentiometer has a malfunction and we will renew it.

If the speed controller no longer works, it may be a malfunction in the printed circuit board or potentiometer. In that case we can possibly replace both parts. Send an email to with the problem and then an email will follow how we will arrange that.