I only went as far as cleaning the condenser and of course we clean the filters after every use.Have you done any maintenance in the last year of use?
1 thermostat and cut out fitted near/on heating element and another stat fitted somewhere around the front drum housing or inside the fluff filter housing.
The 2 stats cut in and out according to temp but the cut out is most likely a one trip device i.e does not reset in the event of over-heating.
No fluff build up noticed yet.Overheating could be caused by fluff build up inside ducting etc, or overloading drum and laundry blocking fluff filter/air flow.
Water collection tray is at the top, I can't see if I can get to the float switch, since I have no clue what to look for ; )Is the water collection tray at the bottom or at the top? If at the top there must be a pump that pumps water up a tube into the water tank. Is the pump functioning? Regardless of where the empty water collection tank is located there will also be a float switch at the bottom in the water reservoir, if the float is stuck in the up position the heating element will remain switched off!