Whirlpool Duet dryer time skips mins.

In some dryer's the control panel relies on a thermistor rather than a CYCLING thermostat to regulate the drum's air temperature by monitoring the component's resistance changes; resistance goes down as temperature increases and up when temperature decreases. Once the drum's air temperature reaches a certain level required to dry clothes, the control panel shuts off the heater. The panel will turn the heater on again and begin another heating cycle when the thermistor indicates that more heat is needed to keep the air temperature constant inside the drum

Lastly check your moister sensor. ( located inside the dryer door usually) Especially if machine seems to shut down early and clothes are still wet.
Test with a meter at room temperature and it should show continuity.
A failed moisture sensor will affect the dryer run time in the automatic moisture sensing cycle but it will not affect the heating of the dryer or the timed cycle. Which are reflected by the thermostats.

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SAME AS MY LAST MESSAGE REPLY

Look for an airflow blockage. Be sure lint filter is cleaned and if lint is accumulated in the air stream path, take a vacuum or brush and clean it out. Dirt and lint are a dryer's worst enemy.

Time Spencer is bad and needs to be replaced.

Well, well.
Am I to understand the timer dial is going really fast as you watch it?
I didn't know that was possible, but maybe the wiring has been compromised (shorted out) somehow. If so, you would need to take it all back apart and look for a wire that is pinched or incorrectly hooked up. Some Whirlpool dryers have numbers on the back of the timer that are supposed to match numbers that are actually printed on the wires themselves.
As far as the lint trap, perhaps one of the "pipes" inside the dryer is unhooked or loose causing the hot air to miss the screen.
Be blessed.

some were he has blocked the out let for lint trap the reason its stopping is its over heating don't use untill sorted it will cause a fire if left

Mine too- then it says dL error! what is that!

Try unplugging for 10 min. This will reboot the system and clear the curcuit of all power. Replug the washer and select spin to drain. Selecting too many cycles in a short period of time can confuse the little brain in the curcuit just like a power surge does after a storm. Clear the brain and start from scratch.

WHEN YOU WASH IS THE WATER HOT ENOUGH IN A REASONABLE TIME? ALSO DOES THE WASHER SENCE THE AMOUNT OF SOAP THATS IN THE TUB. IT COULD BE GIVING ADDITIONAL RINCES TO REDUCE THE SOAP CONTENT.(TRY WITH NO SOAP IN SYSTEM AND SEE IF TIME IS SHORTER)

Shelly on some of the older models they used a inline resistor on the dryers timer. It looks like a inline fuse comming off the timer. If it goes bad the timer will not stop. Check the attachment. Cost around 17.00, Catriver, post back. Part number 3401076