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ASKO T760 Dryer won't allow any changes to program and gets too hot

asko dryer

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3 replies to this topic

#1 pinesprings

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Posted 17 January 2012 - 02:58 PM

Marianne was running the dryer and noticed that there was a "hot" smell, opened the dryer and found the clothes and interior to be extremely hot; so hot that she felt they were too hot to even hold. The machine had not shut off and was apprearing to be operating normally up until the time she opened the door to do this check. After that, she found that the display panel showed the P2 program selected and would not allow any change or input from the panel buttons. Pressing start again starts up the dryer and again it seems to get too hot, but we don't let it get far enough apparently to get to it's overheat shut off switch. It got so hot that the rollers got a bit dented when they cooled and the filter rack doesn't close as securely as it used to; all apparently from the heat. I ran the test program, that is short-circuiting the ST4-1 and ST4-2 and starting the test program. I don't know if the test program is being engaged or not as the display shows the controls still locked and pressing P2 to start the program or waiting 60 seconds for it to start on it's own seems to have no affect. I was looking for the temperature to rise 57 degrees F within 10 minutes, cool down, and then give any appropriate error messages. The temperature rose to about 115 inside the return air area at the bottom front of the machine just leaving the filter area after about 20 minutes. Twice, and I was not able to repeat this unless it happened just by accident, the machine went into a different mode when closing the door. I believe there was a loud click (I think) and then a buzzing sound like a motor not starting or an alarm sounding along with information on the display saying something like "Production Test". There were also numbers on the display which I believe to have been "51" at the top right. Marianne thinks there was also a "151" at the bottom right. I opened the door right away to stop the sound and then when re-closing it the panel lit up with correct information, allowed changes from pushbutton controls, with all P1 - P4 options and menus available. I reset back to P2, regular temp, no delay start, and restarted in "start" and it reverted to the locked up controls mode again. The machine actually went into this production test and running correct mode 2 times, becoming normal and then locking out controls again. It got late last night and that's all the more that I found. At first, I suspected the thermister because of the uncontrolled heat, but that would not explain the frozen controls. I understand that the circuit board and display are expensive possibilities. Please advise if you have knowledge of this particular problem.
Thank you,
John

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#2 pinesprings

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Posted 18 January 2012 - 05:15 PM

It would appear that the control problem has been cured. I still have the problem of the overheat. Last night, I tracked the temperature all the way up to 204 degrees in the tub. The clothes were actually smoking a bit when I opened the door. I checked the inside temperature in the regular dry / normal temperature after about 20 minutes of operation and found it to be about 125, which is pretty much normal. I then let it go for a while and after a total drying time of about 30 minutes, the display changed to "cool down 30" and started counting down the minutes. I opened the door and tested the temperature after about ten minutes of the "cool down" and found the temperature around 190 degrees. I briefly cooled down the interior and then continued the operation in the "air fluff" cycle. After a few minutes in this cycle that should have no heat, I found the temperature still high and over 204 degrees, so the heater was apparently still on. Some smoke emerged from the dryer when opening the door. Do you think this uncontrolled heating which involves not only the normal cycle, but also the air fluff cycle is due to a malfunciton of one of the sensors? or what have you experienced with similar?
Thank you,
John

#3 pinesprings

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Posted 20 January 2012 - 04:22 PM

Well now it really comes down to only one issue. The dryer heats regardless of the cycle setting. I had it heating, and smoking, on the air fluff cycle last night. The thermister ohms out at 51 ohms which is in the allowable range of 40 - 60 per the manual. I ran it in the production test cycle and within a few minutes it was really up in temperature because there is not blower running during the test apparently. No error codes were displayed. Anyone have any knowledge of this ASKO T760 dryer?
Thanks,
John

#4 RegUS_PatOff

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Posted 20 January 2012 - 05:09 PM

I'm not an Asko master (not many on here)
but it would seem that one of the Heater Elements is partially shorted to chassis (ground)
OR the Controller may be bad.
.

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