I called LG...they said to unplug the dryer for 5 min. to reset the timer ...this solved the problem.
They also said not to use dryer sheets during the sensor dry cycle as the coating on the dryer sheets causes the sensor to malfunction as it can't read the humidity level in the dryer.
Yes, you should unplug the dryer. Also, use a kitchen scrubber or something and clean the dampness sensor bars located by the vent. They get coated from the dryer sheets and cannot sense the proper humidity level. Ours always stopped at the 6 minute mark and just kept drying and drying and drying, as at 5 minutes, it goes into the cooling mode.
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lg's have a dry sensor that senses the wetness of the load they are not that reliable.. and will shut down the machine does it work on manual timer? meaning set it on high for 30 minutes.. it will probably run the 30 minutes... I have had this issue with my lg and so I just use the manual settings cheaper than having a 300$ service call. Its a problem with the dry sensor on the lining of the drum...
The moisture sensor is in the lint filter. Remove 4 screws from inside the drum and you have the sensor attached by 2 wires. On my dryer I disconnected then reconnected these 2 wires, reassembled the lint trap and auto dry works fine again.
When you moved the sensor wire on the moisture sensor may have fallen off.
Remove the front panel and locate the wire and the connection. It will be on the right side near the lint filter vent. If it is still connected your timer has gone bad.
Clean off the moisture sensor bars. They are the silver curved strips about 4 inches long inside the drum near the lint fitler. If you use fabric softner sheets, a waxy build up will coat the bars. The dyer can no longer sense the damp clothes, so it goes into the cool down and then shuts off. Time dry bypasses the moisture sensor.
On auto dry cycles, the cycle is controlled by moisture sensing bars located on either the rear or front bulkhead, ( visible inside dryer ) if the moisture sensor bars are shorted together (normally by wet clothing) the dryer will continue to run. If the dryer continues to run when the clothes are plenty dry, check and see if there is anything stuck between the sensor bars, (sometimes a metal sequin will cause this) or see if they are damaged. If not, you may have a problem with a timer contact, if the timer advances and stops moving at the same spot each time, I would suspect the timer. If this is an EvenHeat dryer, examine the control board located to the right of the timer in the control panel, for any burned components. Hope this helps.