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Can I bypass the thermistor? - Maytag Neptune MDE6700A Electric Dryer

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Hi, If you have a gas dryercan I bypass the thermistor? - 2_bing.gif.
The most common problem with a gas and no heat is the ignitor going bad...

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Posted on Aug 03, 2010

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1 Answer

What is the purpose of a thermistor


From a dictionary definition, the thermistor is "an electrical resistor whose resistance is greatly reduced by heating, used for measurement and control."

Essentially, what this means in plain english is, the thermistor is a temperature sensing device, designed to govern temperature or protect the machine from an overheat. In a washing machine for instance, as the water heats, the electrical resistance reduces and the controller measures the resistance to guage the temperature of the water, switching the water heater on, of off appropriately, to maintain the temperature the wash is set at.

More typically in a dryer, there will be several thermistors. One in the drum will do exactly as described above, while one or mor different designs of thermistor will be mounted in the heater unit its self. Typically the thermistors in the heater unit will be designed to cut power to the heater if it faults and begins to overheat. These overheat sensors typically come in 3 formats: "Fail ON" device, which allows voltage through at a certain temperature. A self resetting "Fail OFF" device that cuts power at a certain temperature and when the unit cools, restes and restores power. Finally a Fail safe "Fail OFF" device which fails at a higher temperature than the self resetting device. Typically, this last type of failsafe cutout has to be reset by either pushing a reset pin, or inserting a thin pin into the back of the device to reset the position of the convex bi-metal disc that will fail concave. DO NOT BYPASS THESE DEVICES! Typically most machines will finction with them bypassed but you remove ALL safety cutout function for overheat when you do this and create a fire hazzard!!

Sep 17, 2015 | Dryers

1 Answer

RM 2611


maybe bad 120 volt side of board that is bypassing thermistor

Apr 17, 2014 | Dometic Refrigerators

1 Answer

Heating element not coming on


Since the heating element turns on when the heater relay on the control board is bypassed, the problem must be the control thermistor. It is the one on the wiring diagram inside a circle and located on the blower housing. The indicated resistance of 50000 ohms is the resistance of the thermistor at room temperature. It goes down as the dryer heats up and when the dryer temperature is too hot and the thermistor resistance is too low, the control board turns off the heater relay.

The problem here must be the control thermistor. Its resistance must be too low or even shorted thereby making the control board "think" the dryer is too hot and therefore does not turn on the heater relay at all. Check the resistance of the control thermistor which must be around 50000 ohms at room temperature. Measure the resistance with the thermistor connected and disconnected. If the resistance is good when disconnected but not when connected, then the wires must be shorted somewhere else since the control board has been replaced. Locate the short circuit or simply replace the wire harness.

Aug 16, 2011 | Frigidaire Dryers

1 Answer

Dryer won't start


This usually caused by a blown thermal fuse on the blower housing located behind the rear access panel. This thermal fuse is wired in series with the motor and if it blows, power to the motor is terminated and the motor cannot run. No dryer function works when the motor cannot run.

Unplug the dryer or disconnect power then remove the rear access panel. Locate the thermal fuse then bypass it for troubleshooting purposes.

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Bypass the thermal fuse by disconnecting the wires and joining it together. Insulate properly and plug the dryer back in. The thermal fuse is indeed blown and needs to be replaced if the dryer starts. Do not use the dryer with the thermal fuse bypassed due to fire hazards.

Clean the lint filter and make sure the vent system is not restricted then replace the thermal fuse including the cycling thermostat (thermistor for other models) as a standard operating procedure and preventive measure. The thermal fuse usually cuts out due to a failed cycling thermostat(thermistor for other models).

Jul 19, 2011 | Roper REX3614KW Electric Dryer

1 Answer

Is there any way to bypass the thirmistor on this machine to make sure this is the problem


No, the computer reads the resistance from the thermistor to operate properly. If you try to bypass it, the computer will ring it up as an error and will not operation.

Jul 18, 2011 | Samsung WF328AAW Front Load Washer

1 Answer

I get hE code....after the dryer has been on for a few minutes? is it the thermistor or the coil? if it is the thermistor where is it in the machine?


HE is abbreviated as Heater Error. It could also mean you have a Restricted vent or your thermistor is fried that you need to replace thermistor. you can bypass the thermistor for test purposes by taping the wires together. it is located on the blower wheel assembly, this is a fire safety feature and should never be operated in the bypassed mode. Safety First, unplug before opening.

here are some generic pictures of opening a dryer. once it is verified that the thermistor is the problem, Untape the wires and replace them

http://www.appliancehelponline.com/dryerblowerassy.html

hope i ve been of help.

Cheers.

Jun 21, 2011 | Amana NED7200TW Electric Dryer

2 Answers

Can you bypass the fuse to make sure thats the problem


Hi tjjones24...
Yes you can bypass the fuse/Thermostat/Thermistors..
Just wire the two wires you remove from the fuse/thermostat/thermistor together and tape with electrical tape...if the unit works, then replace the fuse/theremostat/thermistor.
Just be sure to reinstall a new unit if necessary and DO NOT LEAVE THE WIRES TAPED TOGETHER AFTER THE TEST, AS IT CAN CAUSE A FIRE HAZARD.
Free Answer...Please rate me

Apr 20, 2011 | Crosley CDE6000 Electric Dryer

1 Answer

Dryer LED displayed HE and when you go to push start dryer wont start just clicks.Unplugged and plugged back in still same results. Does not show any error code though only the first time when it wouldnt...


hE=Heater error, Restricted vent. Replace thermistor. you can bypass the thermistor for test purposes by taping the wires together. it is located on the blower wheel assembly, here are pictures of opening the dryer. once it is verified that the thermistor is the problem untape the wires and replace. this is a fire safety feature and should never be operated in the bypassed mode. Safety First, unplug before opening. hope this helps Tim:

http://www.appliancehelponline.com/dryerblowerassy.html

Apr 17, 2011 | Amana NED7200TW Electric Dryer

1 Answer

Its a gas dryer and will spin but does not heat up


it can be the gas valve coils on the gas valve body,a bad thermistor or cycling thermostat on the blower housing or the hi limit thermostat on the burner tube,the cycling thermostat and hi limit can be bypassed to test,but not the thermistor or the gas coils

Oct 14, 2010 | Dryers

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