Is your tumble dryer not drying laundry properly and instead leaving them damper than you’d like? Here’s a quick tip regarding something which could create this fault on a modern tumble dryer. Modern tumble dryers usually use sensors to detect the dampness of laundry inside the drum. However, lime in our water or cleaning agents can form a barely visible lining on the inside of the drum, and this can interfere with the readings. The result could be that laundry can still be a little damp after drying.
I’ve no idea how common a problem this is, and other faults can cause the same symptoms, but if your dryer appears to be working ok except it’s just leaving clothes a little damper than it used to do it’s worth thinking about this issue. If you suspect you could have a problem, use a vinegar-based cleaning product to wipe all around the inside of the drum and its paddles.
If the dryer isn’t drying at all, and you can see it’s not getting hot at all try this article – Tumble dryer not heating