I have a problem with the performance of the dryer on my Zanussi WD1272. the clothes get hot but at the end of the cycle are still wet. No problems with washing. Please help

The filters are clogged.
• The condenser is clogged.
• The water reservoir is full.
• The selected cycle is not suitable for the laundry.
• Insufficient drying time.
• The laundry has not been spun properly.
• The low-temperature function selected.
• Excessive laundry load.
• The dryer is not correctly installed.
Also, check the heater elements.
For the movement, check the drive belt has become worn or snapped. To test your tumble dryer's drive belt, we recommend you manually spin the drum. If it is stiff and difficult to move, the drive belt is ok, if it is easy to move, there's a good chance the drive belt is the fault.

You have one of 2 problems. Your clothes are getting put into the machine too wet because the washer isn't spinning them out all the way. Or you have a clogged vent causing the unit to take too long to dry properly because it can't remove the moisture properly. Check your vent outside to see how hard the dryer is blowing the air.

See if it is overloaded or the clothes are excessively wet... Take out 1/2 the clothes and try again.

I am having the same problem on a WD9900A. The wash cycle works great. Spins fast and clothes are completely rung out. Dryer cycle heats up well. Fluffs and heats cloths. At some point during dry cycle water is injected on clothes and they end up sopping wet; much wetter than after wash. Filter is clear. Outlet pipe clear and functions well. Possible problem with dryer timer? Or washer timing kicking back on?

Check and clean filter/s, if it is vented through a hose, make sure it is not blocked or restricted in any way
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Thanks.

you have a clogged wall vent or clogged dryer vent or a clogged lint trap,you are trapping all the hot wet air in the dryer and that's why it's taking so lont to dry-mike

It sounds as if the wash cycle isn't terminated by pumping the rinse water out and spinning to rid the clothing of most of the water.
Most dryers sense moisture but I think they all will have a maximum run-time to prevent possible fires if the programmer fails to shut them down at the end of the drying cycle.
I would watch the machine and when it started the drying cycle, I would shut it off and check for surplus water that hadn't been pumped out as it should have been. 

I managed to solve the problem the following way: I noticed that if you unplug the Sensor-NTC(part nimber 154431 https://www.bosch-eshop.com/eshop(bD1lbiZjPTAwOQ==)/bosch/gb/prodp.htm?prod=WET2820GB%2f13 ) that controls temperature of air in the air channel, the drying cycle runs as you describe above. So this circute was checked up to the power module. Contacts of the Sensors plug were tightened; I think this solved the problem; resistance of the sensor checked. It must be 4.8K at 25 degree C. and decrease when temperature increases. I dipped the sensor in a glass with hot water. 

need a new thermostat

thermostat in door part no 1258406014 should do the job colin