Michael-w, yes you are on track with that, actually caused by a build up of fluff around the felt seal at the rear of the machine next to the heating elements, but this is caused by not cleaning the filter after every use, which also makes the elements run hotter, as it cuts down the air flow.. I was talking with the engineer when he came to do the remedial work (LOL) to our dryer and as we are both involved in the electrical industry, it was quite enlightening. As anyone who has ever been inside a tumble dryer(NOT LIKE THAT!!) will tell you, they are a classic example of minimalist engineering. It really looks as though every component has been reduced until the whole machine is made from parts that have been cheapened and thinned down to the point of almost blinking out of existence. The rear bearing is a tiny lump of oilite bronze running on a 1/4" shaft, and there are no front bearings, the tub is supported on three PTFE pads which the tub skids round on. The drive from the skeleton motor is via a tiny multivee belt direct from the motor shaft and just wrapped round the outside of the tub, and is tensioned by a sprung pressed metal bracket with a plastic pulley. I remarked that it would be almost impossible to reduce the cost of manufacture any more, to which he replied "The latest ones have no belt tensioner fitted, they have substituted an elastic belt"!
Herbert Punter, The low voltage directive and the safety testing, as in PAT or portable appliance testing was a way of creating a new industry (employment), the cost of which would be born by individuals rather than governments, and the whole PAT testing idea is of very questionable value. there are no statistics to show that there was a problem with portable appliance accidents in the first place, and no figures to show if any difference has been made. Most businesses who have to get testing done have now bought their own tester, and do it themselves. There is no requirement for the "professional" who runs a testing business to have ANY relevant training or experience, other than the two day PAT testing course run at many dubious training establishments who are more interested in profit that safety, and to take an electrical safety directive from Europe is frankly laughable, given their notoriously unsafe wiring standards, and their dodgy unshuttered sockets! Of course, you must also remember that it only applies to Portable appliances in the workplace, not in the home, When I started in the electrical industry in 1967 My first few months was spent on workshop repairs, everything from irons and kettles, through vacuum cleaners, to industrial pumps, fans and local authority equipment, virtually everything was BSI compliant, and marked as such, which meant it had been physically tested by an outside agency. Standards have gone through the floor, as has quality of manufacture. Pity the youngsters who think they are spending their hard earned on the peak of modern technology!