Lint build up is preventing the machine from drying properly.
Most people only remove the lint on the front of the machine where hot air is usually expelled, but lint also builds up on the inlet vents over time and needs to be removed. The hot air cannot get inside the drum because the vents are blocked and hot air is being re- directed where it is not supposed to go. Removal of lint from inlet vents usually involves removing various panels and should be done every 24 months depending on how often the machine is used.
jozi, February 2015