Hob controls not responding

What it usually means

A touch control is not a switch. It is a sensor watching for the change a fingertip makes to a small electrical field through the glass, which is why it works through a thin film of water and not at all through a rubber glove. Understanding that explains nearly every case of a hob that will not take an instruction, because the failures are mostly about the hob detecting the wrong thing rather than detecting nothing.

The commonest is something resting on the panel. A cloth thrown over the controls, a pool of liquid that boiled over, a chopping board pushed back, the lid of a pan left on the glass — each reads as a finger held down permanently. A hob that sees a key held for more than a few seconds does not simply ignore that key: most makes stop responding altogether and display something, on the sensible principle that an appliance being pressed by an unknown object should not be accepting commands. Wipe the whole panel dry with a towel, take everything off the glass, and try again before assuming anything is broken.

Heat is the second cause, and it is specific. Hot cookware standing on or very near the control area upsets the sensing and can lock the panel out until it cools, which some manufacturers publish as its own condition rather than a fault. A related one is time: many hobs impose a maximum continuous run time that varies with the power level, so a zone left on a low setting all afternoon switches itself off by design. Neither is a breakdown, and neither needs a part.

Locks are the third, and they cause more confusion than the rest together because there are usually two of them. A control panel lock freezes the hob while it is cooking and clears when the hob is switched off. A child lock is designed to survive being switched off, which is exactly what makes it look like a fault: the hob comes on, shows a letter or a padlock, and refuses every instruction. Some makes show the same character for both, so the useful test is whether it persists after a full power-off — a lock that survives is the child lock, and its release sequence is a documented hold on a particular key.

Then there is the case where the panel works and simply will not heat anything: demonstration mode, present so shops can display a live hob safely. And the finger itself matters more than people expect. Gel nails, plasters, a very dry hand in winter, or pressing with a knuckle can all fail to register, while a wet finger on a dry panel usually works better than a dry one. If none of that helps, the hob is entitled to one power cycle at the wall — a minute off is the manufacturers' own first suggestion for an unresponsive control module. What it is not entitled to is being reset over and over, because a fault that returns after every reset is telling you something.