Cooker hood won’t turn off (all brands)

A cooker hood that keeps running and won’t switch off via its normal controls is a less common but genuinely disruptive fault, and worth a couple of quick checks before resorting to isolating power every time.

What to check first

1. Check for a stuck physical button, especially on older hoods with mechanical rocker or slide switches — a button that’s physically jammed in the “on” position won’t respond to being pressed again.
2. Check a remote control (if fitted) isn’t stuck transmitting, or try removing its battery temporarily to rule this out as the cause.
3. Try isolating power briefly (a minute or two) at the wall or fused spur, then restoring it, to see if the control board resets to an “off” state — this won’t fix an underlying fault but confirms whether it’s a one-off glitch.
4. Check if a delay/auto-off timer function exists and may have been set to run for an unusually long duration by mistake.

When to call an engineer

If a stuck button, remote, or power reset doesn’t resolve it, the control board or the relay controlling the fan motor has likely failed in the “on” position — worth a professional check, and reasonable to isolate power to the hood between uses in the meantime.