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No heat dryer runs but no heat 2 thermostsats tested thermal fuse and ignitor all ok but still no heat

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Gas dryer runs but no heat. Took it apart cleaned all ducts and lots of years worth of dirt out of entire machine, looks brand new. Tested all components.


You did quite a bit of work. One other thing that controls the ignitor is called the flame detector. Its the black box looking thing mounted on the side of the big pipe the flame shoots into. Should be 2 wires going to it. A quick test to see if the ignitor comes on is to tie the 2 wires together. If you see the ignitor come on thats the bad part,

Jun 29, 2015 | Dryers

1 Answer

Dryer does not heat up model mdg508daww tested ignitor,radiant flame sensor,thermal fuse and tried limit fuse and cycling fuse checked blower wheel and made sure there was no air flow restrictions and...


Hello,

A few other things that could make the dryer not heat are,

Heat selector switch on the control panel

Timer

Motor


A quick question though...i see where ya tested the ignitor but what i would like to know is does it glow or not

To test the heat selector switch ya need to use a multimeter set to measure ohms of resistiance and test the following to have Zero ohms resistiance when set to high heat setting

Red wire to blue wire terminal (wire must be removed)
Red wire to yellow wire temninal

The heat circuit on the timer is
Yellow wire terminal on the timer to the red wire terminal...on that too the wires need to be removed off of the timer

On the motor the heat circuit on the motor switch is the yellow/black wire to the black wire to determine if its good the igniter can be checked for POWER (120 volts) since the motor only sends power to the ignitor when the dryer is running because itsa built in safety feature that will prevent the dryer from heating when not running


Good luck,
GENE

Oct 03, 2011 | Dryers

1 Answer

Dryer runs but does not heat.


Hi.

Check the thermal fuse. The fuse can be tested reading impedance.You can replace the fuse straight away, or you can first test it using a multimeter set on Ohms. If the multimeter reads Ohms infinity when you touch the fuse contacts with the probes, then the fuse is gone. A good fuse will read zero or low impedance.

If the fuse is OK, then you can have a defective thermostat.
In the same way you test the thermostats, thermistors or cutoff located in the heating group, near to fan and element. If they are OK, then they will be conductive at room temperature and will read zero Ohms. If they are bad they read open (infinity). You need to disconnect the part's contact to test properly.

The rest depends if the dryer is electric or gas.


On electric dryers you test the heating element. The heating element is tested in the same way. Set multimeter on impedance, disconnect element, and touch contacts with multimeter probes. If it reads open, then element is gone. A good element reading depends on the specific model. Most washer-dryers, including Whirlpool and Maytag read between 10 and 20 Ohms.


With gas appliances you need to test the ignitor, then coils and then the flame sensor. The ignitor is the most common cause for the problem. Heating coils problems are also common. The flame sensor does not fail very often.

Regards.

Ginko

Sep 06, 2011 | GE Dryers

1 Answer

Dryer air is not getting hot. All other functions still work.


There are several things that can prevent a dryer from not heating.. Unplug Power Before checking.
Electric Models
1- Power- Your dryer runs on 220volts. 110 runs the entire dryer and 110 runs just the element. Your breaker may have half tripped. Check to see if you are getting the correct amount of power by using a ohm meter. Also check the power cord for burn marks on the plugin and the cord itself.
2- The thermal fuse can prevent this from heating. The thermal fuse is a sensor on the blower housing the measures the temperature of the air. There is a cycling thermistat near the thermal fuse. If the dryer temp gets over 190-220 degrees the thermal fuse will blow to cut power to the element to prevent fire. You can test this by using a continuity tester.
3- High limit and/or thermal cutoff. These are both sensors on the heating element housing. Thermal cutoff is at the top and the high limit is near the bottom above the heating element connectors. Test these with a continuity tester.
4- Heating element- Just below the high limit on the heater housing. Test for continuity.
5- Motor- The motor has to reach a certain rpm to activate a sinfrigrial switch inside the motor. If the rpm is not reached it will not allow current to go to the element.
6- Timer- Make sure you are trying this on timed dry. Sometimes people use air fluff and forget to change it back. The timer could also not be sending current to the heater.

Gas models
1- Electric ignitor- Inside the flame tunnel inside of dryer near where gas line hooks up. Usually if it glows than it is still good but check to see if it is sending and amp signal to the heat coils.
2- Heater coils are two valves that open up when the ignitor send signal saying the ignitor can ignite the gas. Heat coils will not open to send gas if it does not receive a signal from the ignotor. They look like two round disk with two wires running from ignitor.
3- Flame sensor- Change if you change the heater coils. The flame sensor could not be detecting the flame inside so it shuts down the ignitor.
4- Motor- See above
5- Timer See above

If you have any further questions or need further assistance please feel free to comment me back

Jul 28, 2011 | Kenmore 63942 Dryer

2 Answers

Dryer is running, but heat will not turn on


There are several things that can prevent a dryer from not heating.. Unplug Power Before checking.
Electric Models
1- Power- Your dryer runs on 220volts. 110 runs the entire dryer and 110 runs just the element. Your breaker may have half tripped. Check to see if you are getting the correct amount of power by using a ohm meter. Also check the power cord for burn marks on the plugin and the cord itself.
2- The thermal fuse can prevent this from heating. The thermal fuse is a sensor on the blower housing the measures the temperature of the air. There is a cycling thermistat near the thermal fuse. If the dryer temp gets over 190-220 degrees the thermal fuse will blow to cut power to the element to prevent fire. You can test this by using a continuity tester.
3- High limit and/or thermal cutoff. These are both sensors on the heating element housing. Thermal cutoff is at the top and the high limit is near the bottom above the heating element connectors. Test these with a continuity tester.
4- Heating element- Just below the high limit on the heater housing. Test for continuity.
5- Motor- The motor has to reach a certain rpm to activate a sinfrigrial switch inside the motor. If the rpm is not reached it will not allow current to go to the element.
6- Timer- Make sure you are trying this on timed dry. Sometimes people use air fluff and forget to change it back. The timer could also not be sending current to the heater.

Gas models
1- Electric ignitor- Inside the flame tunnel inside of dryer near where gas line hooks up. Usually if it glows than it is still good but check to see if it is sending and amp signal to the heat coils.
2- Heater coils are two valves that open up when the ignitor send signal saying the ignitor can ignite the gas. Heat coils will not open to send gas if it does not receive a signal from the ignotor. They look like two round disk with two wires running from ignitor.
3- Flame sensor- Change if you change the heater coils. The flame sensor could not be detecting the flame inside so it shuts down the ignitor.
4- Motor- See above
5- Timer See above

If you have any further questions or need further assistance please feel free to comment me back.

Jul 27, 2011 | Kenmore Dryers

1 Answer

Dryer will not heat up when running. Was told to check the thermo fuse, ignitor and/or coil. Is that right? How do I check those things.


hello there
Please follow this procedure I have provided below and it will tell you how to test each one ok
Hope this is very helpful


Investigate these five areas if your dryer is not heating up:

Proper Voltage

If your dryer won't heat up, it's possible that it is not being supplied with the proper voltage. Here are three ways to make sure power is getting to your dryer: First, make sure your dryer is plugged in. Next, check the circuit breaker panel to make sure all the circuit breakers are in the correct positions. Finally, check to make sure no fuses in your fuse panel are blown. Any of these could explain why power is not getting to your dryer.

dryer_heating-element.jpg Heating Element

It is possible that your dryer isn't heating because its heating element is defective. Heating elements are irrepairable. If yours has ceased to function properly, you will have to replace it. Open your dryer's cabinet and locate the heating element so that you can test it.
dryer_thermal-fuse.jpg Thermal Fuse

Another possible cause for a dryer not heating up could be attributed to a faulty thermal fuse. Once a dryer's thermal fuse has blown, it is no longer of any use. If your dryer's fuse is blown, you will have to replace it. Open up your dryer's cabinet and locate its thermal fuse so that you can test it.
dryer_thermostat.jpg Thermostat

If any of your dryer's thermostats have become defective, they could be the reason that your dryer is not heating. Open up your dryer's cabinet and test each of your dryer's thermostats. If any are faulty, replace them.
dryer_timer.jpg Timer motor

A defective timer motor could also cause your dryer to not heat up. Test your dryer's timer motor. If it is no longer functioning as it should, replace either the entire motor assembly, or just its motor.























Jan 24, 2010 | Kenmore Dryers

1 Answer

Tested every part for continuity, replaced ignitor, still no heat


If the dryer runs , but no heat , then the thermal fuse is probably the problem . Unplug the dryer and remove the lower front panel . Remove the inside filter from inside the dryer , and remove the filter housing form the front , held on by 2 screws and the clip holding it to the blower housing . You will see 2 wires going to a flat egg shaped piece ( you may not be able to see the piece , but you can see the wires ) . This is on the left of the visible thermostat . Remove the 2 wires from this piece and put them togather . Plug in dryer and see if burner lights then . If so , then replace the thermal fuse . Pt # 3392519 .

Sep 10, 2009 | Whirlpool GGQ8831L Gas Dryer

1 Answer

There is no heat


Disconnect power and access your dryer fuses. Check and test your fuses for "continuity". Most likely, a white thermal fuse. Can possibly be your ignitor or heat element as well. Is your dryer gas or electric?

Jan 27, 2009 | Hoover Dryers

2 Answers

Gas dryer is not heating up, after being moved


BE SURE THE GAS IS TURNED BACK ON. CHECK THE TEMP SELECTOR SWITCH TO BE SURE IT IS SETTING ON A SELECTION AND NOT BETWEEN SETTINGS. BE SURE IT IS NOT ON FLUFF AIR/NO HEAT. IF THAT IS ALL O.K., THERE ARE FOUR ITEMS TO CHECK IN THE HEAT CIRCUIT.
1. IGNITOR. CHECK FOR 120 VOLTS AT THE IGNITOR TERMINAL CONNECTION WITH DRYER RUNNING.
2. WATCH THE IGNITOR. IF IT GLOWS, CLICKS, GOES OFF WITH NO FLAME, ONE OF THE SOLENOIDS IS BAD. REPLACE BOTH.
3. IF THE IGNITOR COMES ON BUT NEVER SHUTS OFF,
THE RADIANT SENSOR IS BAD.
4. IF THERE IS NO RESPONSE FROM ANY OF THE CHECKS ABOVE, THERE IS A THERMAL FUSE ATTACHED TO THE EXHAUST PORT. IT MAY BE BAD. CHECK FOR 120 VOLTS ON THE TWO TERMINALS OF THE THERMAL FUSE WITH THE DRYER RUNNING. IF YES, THE THERMAL FUSE IS BAD.

Apr 21, 2008 | Dryers

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