ELECTRICDryer no heat or little heat, or shuts down to fast:
Checkyour venting and lint basket. Check blower for lint build up and blower wheel obstruction., test by trying to turn the wheel manually by hand (should be easy) May have to remove cabinet or front/back plate to get to it)
Next check the heating element itself with a meter for continuityit should showOHMS CLOSED CIRCUIT. If not its defectiveor has a short if its grounding out? Which in turns causes blown fuses or thermostats or overheating.
The heating elements are located inside the heater ducts. If you think a heating element is faulty, test it with avolt-ohm-multimeter(VOM)set to the RX1 scaleat 20K ohms. Disconnect the leads from the power terminals and clip one probe of the VOM to each terminal. The meter should read about 12. (1200)ohms.If the reading is higherohms, the heater is faulty and should be replaced. Replace a faulty heater with a new one of the same type and electrical rating. A heater connected to a 115-volt line usually has an 8.4-ohm resistance; a heater connected to a 220-volt line usually has 11 ohms resistance.
Check dryer Terminal block prongs both outside prongs should give combined 220, and 110 each if u check 1 outside & 1 center (ground) prong. Also check house electrical outlet for full voltage. 220 because if u only get half or 110 volts you will be able to run the machine which uses only 110 to run motor but not the heater which uses a full 220,OR?you may have a broken centrifugal switch in the motor because this switch activates the motor and the heater as well. supposedto be if the motor does not run, the heater should not heat in order not to createafire but ifthe motor is not running,andthe heater is still heating, then there could be a problem with the motor centrifugal switch that is connected to this interlock switch that should trigger the heater.
Check the thermal cut off, the cycling and the hi limit thermostats. For continuity or OHMS. If no ohms or resistance they need replacement.
In somedryer'sthecontrol panel relies on athermistorrather than aCYCLING thermostatto 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 thethermistorindicates that more heat is needed to keep the air temperature constant inside the drumthis is why in some cases the dryer will operate at lower cycles like gentle or low heat but not at higher settings?)
Lastly check your moister sensor.( located inside the dryer door usually) Especially if machine seems to shutdown early and clothesare still wet. Test with a meterat room temperatureand it should show continuity. A failed moisture sensor will affect the dryer run timein the automatic moisture sensing cyclebut it will not affect the heatingof the dryer or the timed cycle.Which are reflected by the thermostats.
Answers & Comments
ELECTRICDryer no heat or little heat, or shuts down to fast:
Checkyour venting and lint basket. Check blower for lint build up and blower wheel obstruction., test by trying to turn the wheel manually by hand (should be easy) May have to remove cabinet or front/back plate to get to it)
Next check the heating element itself with a meter for continuityit should showOHMS CLOSED CIRCUIT. If not its defectiveor has a short if its grounding out? Which in turns causes blown fuses or thermostats or
overheating.
The heating elements are located inside the heater ducts. If you think a heating element is faulty, test it with avolt-ohm-multimeter(VOM)set to the RX1 scaleat 20K ohms. Disconnect the leads from the power terminals and clip one probe of the VOM to each terminal. The meter should read about 12. (1200)ohms.If the reading is higherohms, the heater is faulty and should be replaced. Replace a faulty heater with a new one of the same type and electrical rating. A heater connected to a 115-volt line usually has an 8.4-ohm resistance; a heater connected to a 220-volt line usually has 11 ohms resistance.
Check dryer Terminal block prongs both outside prongs should give combined 220, and 110 each if u check 1 outside & 1 center (ground) prong. Also check house electrical outlet for full voltage. 220 because if u only get half or 110 volts you will be able to run the machine which uses only 110 to run motor but not the heater which uses a full 220,OR?you may have a broken centrifugal switch in the motor because this switch activates the motor and the heater as well. supposedto be if the motor does not run, the heater should not heat in order not to createafire but ifthe motor is not running,andthe heater is still heating, then there could be a problem with the motor centrifugal switch that is connected to this interlock switch that should trigger the heater.
Check the thermal cut off, the cycling and the hi limit thermostats.
For continuity or OHMS. If no ohms or resistance they need replacement.
In somedryer'sthecontrol panel relies on athermistorrather than aCYCLING thermostatto 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 thethermistorindicates that more heat is needed to keep the air temperature constant inside the drumthis is why in some cases the dryer will operate at lower cycles like gentle or low heat but not at higher settings?)
Lastly check your moister sensor.( located inside the dryer door usually) Especially if machine seems to shutdown early and clothesare still wet.
Test with a meterat room temperatureand it should show continuity.
A failed moisture sensor will affect the dryer run timein the automatic moisture sensing cyclebut it will not affect the heatingof the dryer or the timed cycle.Which are reflected by the thermostats.
Read more :
https://www.youtube.com/watch?v=wVTBrGMql7g
http://www.ehow.com/info_12203962_check-dryer-thermistor.
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https://www.youtube.com/watch?v=MMP7BW1lLs4