Silly question. Is it normal for a hairdryer to overheat and cut out way before you’ve finished? Is this a quality issue or is it faulty/damaged?
I’ve been having this happen with different cheap hairdryers. And while my hair is difficult to get dry/takes ages, it isn’t even going for a long time. I only ever rough dry my roots and am having the dryer cut out before I’ve finished doing that.
Check if the intake is blocked by dust/lint. Even if partially blocked might not be getting enough airflow through to counter the heat, and safety cutoff can happen. If all good, then probably it’s just a badly designed hairdryer. Sometimes it’s worth paying a bit more for a basic name brand item than the super cheap ones. Maybe in the Boxing Day sales you could find a bargain?
It’s normally the appliance that’s faulty and tripping the circuit. Try using the hairdryer in another part of the house that’s on a different circuit and see what happens.
If it doesn’t trip then you may need to replace the safety switch at the circuit board. Hope that helps