I have an Asko dryer model T721 that has stopped drying. Initially, it stopped producing hot air, but produced warm air on the low setting. Now it runs...just produces no heat. Pressing the reset on the back of the unit is ineffective.

SOURCE: my Asko T721 Electric Dryer is having drying troubles

Here's the answer:
The dryer has a thermo protection "fuse" that pops-out when the lint filter is not cleaned and air will not flow properly. When the airflow is restricted the dryer gets too hot and the "fuse" pops. Then it will not run unless you stand there and hold the start button in. As soon as you stop pressing the button the dyer stops running.
Clean the filter ESPECIALLY the "internal" filter. This one is behind the lower skirt of the machines face. There are two Torex head screws (T20) to be removed and the skirt comes right off.
Inside you see two red handles that you turn to open the filter door. Open the door and pull out the filter. It is a long metal finned box. Take it to your bathtub and run a ton of water through both ends to remove the lint inside. You'll be surprised at how much.
O K now let's "fix" the "fuse". Here it is likely you will need to pull the machine away from the wall. The fuse is a black plastic button about the size of a penny. It sits in the center of the machine's backside. It faces up a bit and if you have clearance you can reach your arm over the machines top and press it "in" with a finger. It clicks when you do so. This part is a no brainer. The dyer will now start properly.
The hard part to all of this is pulling the machine away from the wall since like me you probably have it sitting on top of an Asko washer. Take your time. You can do it.

SOURCE: ASKO T721 dryer - Squeaking

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.

SOURCE: overheat trips Asko T721 dryer

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

SOURCE: My Asko dryer does not dry clothes. It shuts off

It is quite common for lint to cover the blower on these units, making it impossible for the dryer to move any air.

1)remove the lower panel. you will need a T20 driver for this and may need to tip the dryer slightly to the rear

2)remove the left part of the blower plenum. this is held by 3 plastic tabs and a T15 screw

You will now see the blower wheel, it is a squirrel cage type. Check for lint buildup, broken vanes, or string/thread wrapped around the shaft.

if there is no problem with the blower then there is another reason you are not moving air. let me know if this helps

SOURCE: asko dryer blows fuse

Hi, there are a number of possibilties to why it blows a fuse, and since you've recently transported the unit that increases the number of things it usually may be, unfortunately making it harder to diagnos. I would start by checking the fuse holders themselves. The only way to really check them however is to replace the holder. The reason being this, even under normal use the fuse "hub" and "holder" wear due to metal fatigue. The holder has a small spring in it which doesn't apply enough force to allow the fuse to "seat" or contact properly in the "hub" and in turn creates added resistance ( heat ), greater resistance equals greater amperage and "poof" hence the fuse blows as soon as you try and start the unit. Of course other things may have been damaged during the move such as the heater. Try starting it on a "air dry" ( no heat ) cycle. If it doesn't blow a fuse you know it is related to the heater, contactor, ( what Asko refer's to as a relay switch ) or wiring to and from the heater. Hope this was helpful to move you forward. Let me know what you find and if I can assist you further I certainly will try. God knows I've seen alot of these Asko appliances ha ha ! **Sorry if this appears crampy writing and bunched together, I'm on my iphone and it's my only source to the internet at the moment.** Good luck, macmarkus :)