The mother has a whrlpool gas hob, it has four rings with eletric ignition (one switch for all rings ignition). A fault has occured with one of the ignition spindles - it will not stop producing a spark even though no one is operating the ignition switch. It constantly produces a spark until the power is turned off at the mains.The other three are fine and work only when required. No obvious sign of any damage etc.
Could anyone suggest a remedy? Apart from buying a new hob.
Thanks in advance