The function selector (power control switch) of an electric hob is the control used to set the heating level of a cooking zone. In mechanical models it switches the heater on and off in stepped or continuous cycles to regulate the average power. In many modern glass-ceramic and induction hobs, this function is handled by an electronic power module and a touch control panel, but the goal is the same - precise heat regulation.

Typical faults include: the zone not turning on, heating only at one level, running intermittently, not switching off, overheating, crackling/sparking and a burning smell, or the hob showing an error. Common causes are burned contacts, worn internal mechanisms, damaged wiring, overheated terminals, or failure of the power electronics (relay/triac) in electronic versions.

Repairs usually involve checking terminals and wiring, restoring solid connections, and replacing the switch or control board with a compatible part. Always disconnect the hob from the mains before any work.