Asko T721 dryer. Support rollers started to fall to bits (dryer making bumping sound as it rotated) so I bought a new set and replaced them. Not a single electrical connection was removed bar the door switch wires .... and now it won't run? The power light comes on but no action at all when start button pressed? I have checked the thermal reset at back (wasn't popped) and also looked for fuses but my model has solenoid type circuit breakers and these look fine. Dryer was functioning perfectly (bar noisy rollers) prior to disassembly, no wires removed, have checked all connections pushed on securely etc... Any idea's on what could be wrong?

I believe asko says this is normal at start up and should stop after the drum has been spinning for a bit.

http://www.ehow.com/how_6899980_replace-asko-dryer-belt.html

These are fairly new to me but I do have a service manual:

ASKO DRYER

How a tumble dryer works is on my home page HERE





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You need to have your drum rollers replaced, they are making the noise because they are falling apart.
Also it could be or include the drum belt breaking down and falling apart...which means its about to break.
Normally pretty cheap parts can be found on the net...look around.
Its a pretty easy fix.

the start button is bad. you will have to get it replaced take the model and serial# and go to your local appliance part store and they should have one.

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If you have a condensate tank that fills up too much the float inside the pump housing will shut the dryer off also.

When we had this problem the solution was to replace the motor, the electric coil in the motor had a flat spot which would not make contact and let the motor start. By moving the drum you are advancing the motor away from the flat spot. Hope this helps.

the dryer needs a service you need to replace the front rollers,jockey pulley and grease the jockey pin,check or replace the belt.remove the lint build up from the front frame and element assy.also check that the felt and rubber seal arond the front frame hasnt come out.you can replace it but its hard to get in and you may have to replace the front frame.i find its any easy repair but i see a lot of asko dryers (not because there bad they just need a service about every 5-7 years).hope this helps.

usually whin you get one thump (or a quick double thump) you have a dent in the roller surface of the drum itself. Easiest way to check this is to unplug the unit and take the top off by removing the 3 torx screws in the rear, then lifting the top off. Once the top is off look at the very front edge of the drum as you rotate the whole thing by hand. If you see any irregularities on the surface, thats your problem. If you see nothing it could be a bad motor or roller, but its unlikely if its happening in the same place on the rotation evry time. What has usually happened with dents in the surface of the drum is that the unit was set down too hard (or dropped) and the wheels it rests on dented the metal they ride on. If thats the case the only solution is to replace the drum or live with it .Good Luck!