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A dryer moisture sensor can stop working without notice, until you notice your clothes being over dried or still wet at the end of the cycle. It is a good practice to test the dryer moisture sensor periodically. There are two types of moisture-detecting sensors for dryers. Once you understand how they work you will see how to test each one. 1. Sensor BarThese sensors contain digits that protrude outwardly. They work on an electrical current and the moisture from the clothing. The first step to test is to place completely dry clothes in the dryer and turn on the dryer; it should run for a few moments and then shut down right away. Secondly, place damp clothes into the dryer, turn on the dryer and watch the timer. As the clothes begin to dry the timer will move and shut off. 2. ThermostatThe timer is regulated by the thermostat. The thermostat rests in a closed position. To test this type of moisture sensor, place damp clothes in the dryer. Watch the timer; as the clothes begin to dry, the thermostat should open and the timer will move forward ,eventually shutting off.
Timer motor is shot. Remove a wire from it and check continuity. If the timer does advance in timed dry i suggest you yank out the dryness board and clean the contacts. The dryness board is a small board with a capacitor mounted on it. The capacitor is connected to the drying sensor bars inside. As the wet clothes rub the sensor bars the capacitor gets discharged. When the capacitor gets fully charged (because the clothes are dry) then the timer motor gets power. If the contacts on the board are corroded the motor won't advance. If it advanced and shut down after only a few minutes that is dirty sensor bars (no moisture being sensed). MORE
Will the timer advance in the NO HEAT mode? If it does advance you would know it has something to do with the temp alright but if it don't advance in No Heat then the timer motor is bad in my opinion. And it can fail by more than one way. Open winding OR stripped motor gear.
OK, your control board and LED are integrated, so you will need to just replace the control board. I would try a hard reset before replacing the board. Pull the plug or, shut down the appropriate breaker switch for 5 minutes. Re apply power after the 5 minutes are up. if you continue to experience this fault, replace the control board asap.
Normally if you have an automatic cycle that turns off the dryer when the clothes
are dry, it will do it with a special thermostat or moisture-sensing
system. The thermostat tells the dryer to heat until the interior of the dryer reaches a "pre-set" temperature. When the dryer reaches the pre-set temperature, the thermostat tells the timer to begin advancing. If there is a moisture sensor, the timer advances only if the moisture content of the clothing is low enough. The timer advances until the interior cools, then the termostat tells the timer to stop advancing, and tells the dryer to start heating again. This cycle continues until the clothes are dry. But... if the vent is clogged, the dryer may never reach the proper operating temperature, so it doesn't send the signal to the timer and the dryer continues to run indefinitely, even if the clothes are completely dry. To fix this problem, clean the vent and/or internal ductwork and make sure the vent is not compressed or kinked. If that doesn't work, then your thermostat, moisture sensor or timer could be the culprit. .