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Some dryers have a moisture sensing strip in the drum area of the dryer. If this sensor gets coated with an insulator, like silicon from the backing on carpets, it does not sense moisture. When this happens, the dryer times out and shuts down. This prevents the dryer from running even after the clothes are dry.
Hello. I really need the make/model number to help you accurately. However, depending on the model dryer you have, look on the control panel for a button or buttons that have a "key" symbol or the word "lock" underneath. Normally, you would hold the button down for 3-5 seconds until the lock light goes out. This is the indication that the control panel is unlocked and normal operation can be initiated. The manufacturers put a panel-lock feature on the units to prevent "busy little hands" or others from changing settings, for unattended safety, etc. Dishwashers, ovens, ranges, and other appliances also have locks for the control panel. If your dryer initiated a control lock by itself, this would indicate a shorted button on the control panel--soft touch buttons and glass touch-control panels are notorious for doing this. If I have the model number, I can usually provide the part number and/or procedure for getting into diagnostic mode to see any stored error codes(if any) which would help pinpoint a problem. I hope I helped you!
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.
A timed drying cycle uses the timer alone to stop the drying cycle. Once it times out like an egg timer a set of contacts open up shutting off the dryer. Or a set of contacts closes to activate a relay which in turn shuts off the power.
Auto dry usually uses a moisture sensor which would do the same thing as the timer. Once it doesnt sense moisture in the load for a predetermined time it in turn triggers a relay which shuts the power off. Some auto dry cycles just use the timer alone and guess-timate the drying time by the selection.
If yours does not use a moisture sensor then most likely it is your timer/cycle switch. There may or may not be a relay involved.
Most dryers have a basic wiring diagram on the inside somewhere on one of the panels which will help.
Since yours is acting up on both cycles Im guessing you have a bad relay or connection to that relay somewhere IF it uses a moisture sensor.
if the timer will not advance through the cycles and the dryer is getting hot try the timed setting not the sensed setting and if the problem continues on the sensed side only it is not the timer it is the sensor , the sensor is what senses the temperature inside the dryer that is what advances the timer on the sensed side it could be that the timer could be good and the sensor be bad try that
Check your breakers. Mine was doing the same thing, all of the 120v parts of the machine were working. (blower/drum motor/ lights) However the element wasn't coming on. Went to the breaker and found that one side of the 2 pole breaker was tripped. Turned both off and back on. Heater started working again.
When you set the dryer on settings such as normal or permanent press, it engages the various sensors that help the dryer to make the most efficient use of energy. Moisture sensor, heat sensor etc. (THAT IS WHAT TURNS ON YOUR AD SETTING) Normally it selects a time based on factory settings that it believes your load should be dried by. Say 50 minutes at Normal (high heat, normal) Every so often during the cycle, the machine will check the humidity sensor and the other sensors and try to see if the dryer is still on schedule. Sometimes it will determine that more time is needed, occasionally less time. While it calculates, it displays the Ad meaning that the machine is on auto dry. TO TURN OFF AUTO DRY, set it to a time setting instead of a DESCRIPTION setting.