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Inside the dryer are two metal strips that sense the moisture in the clothes. The clothing passes over the strips and create an electrical path with the moisture in them. The metal strips sense the resistance in that electrical path and send that resistance reading to the control. The control then reads the resistance reading, interprets the resistance and from that reading determines how long the dryer needs to run. The less moisture in the clothing, the higher the resistance. The problem is that over time, detergent and softener residue builds up on the metal sensor strips and creates an insulating barrier between the strips and the clothing. Since the strips cannot sense the moisture in the clothing because of this barrier, it sends a high resistance reading to the control. The control then interprets that to mean that the clothes are dry and shuts off prematurely. You will need to clean those strips with a Scotch Brite pad, steel wool, sand paper or other abrasive to remove that barrier. Let me know what happens.
Were you able to locate those strips for cleaning?
Cleaning those strips should solve the issue you are having with your dryer.
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Can you post a picture of what you cleaned, please?
See the attached page. Is this what you cleaned?
That picture I sent you is on the inside of the machine, on the filter housing, back side of the front panel.
If it is taking two 40 minute runs to dry, you have an air flow issue. Remove the vent from the back and try a load. Any change?
Hmm, the model shows different in the service information, sorry for the confusion. If it is a condenser dryer, it does not have a vent. I apparently have the wrong information for the model you provided so I am going to place your question back to the list.