How Does A Gas Dryer Work? — Appliance Repair Tips



not all dryers look the same but all of them operate in the same manner through a combination of three main factors airflow heat and drum rotation in this video we will address how these three factors work together as well as potential problems you may encounter when operating the dryer uses a blower wheel to draw air in from the front or rear of the appliance the air is heated and circulates through the clothes as the drum rotates the hotter the air the more effective it is at removing moisture from the clothes you can expect an average load of clothes to take about 60 minutes to dry for gas dryers the air is heated by a burner and air flow is vital to its proper operation to ensure your dryer has sufficient air to operate it should be located in an open well-ventilated area and not in a cramped closet or laundry room for proper air flow the rear of the appliance should be kept several inches away from the wall if the airflow is poor the flame will not be pulled through the burner housing properly this can cause the high-limit thermostat to heat up and switch off the voltage to the burner assembly the thermostat will reset after it cools and the process will repeat however the dryer will take too long to dry because the heat is continually being shut off and the thermostat itself can become damaged some models will also have a thermal fuse on the blower housing poor air flow can cause this fuse to fail if this happens the dryer will not heat at all until the fuse is replaced if functioning properly the heated air is pulled evenly through the tumbling clothes and then through a lint screen to maintain proper air flow it's important to clean the lint screen after each load the last stage of airflow is the exhaust stage the heated air that has removed the moisture from the clothes must be vented to the outside of the home an exhaust vent is used for this purpose there are two types of venting material that can be used each has a different length limit the best type to use is rigid venting which is usually efficient up to 40 feet in length however be aware that any bend in the venting impedes air flow and reduces the length limit for efficient operation for example each 90 degree Bend subtracts 8 feet from that 40 foot limit the other type of venting you can use is semi rigid this type of material is usually efficient up to 20 feet in length again any bend will impede air flow a 90 degree bend will subtract 8 feet from the allowable 20 foot total use only rigid or semi rigid venting any other material may increase the risk of fire as the lint in the vent could ignite during normal operation since an exhaust vent clogged with lint is the most common cause of restricted air flow we recommend cleaning out the vent at least once a year as we mentioned earlier the air inside the dryer is heated by the burner the burner is energized by a standard 120 volts of alternating current when the timer and heat setting are selected on the dryer control panel and the start switch is activated the voltage passes through the cycling thermostat the high-limit thermostat and the thermal fuse if applicable to the model on its way to the burner assembly the voltage then travels through the flame sensor and the first gas valve coil before reaching the igniter the igniter will begin to glow and when it gets hot enough the flame sensor will detect the heat and switch off which diverts the current to the other gas valve coils the coils then activate plungers in the gas valve which allow gas to flow out into the burner housing since this happens very quickly the igniter is still hot enough to ignite the gas establishing a long blue flame with an occasional yellow tip at its end to maintain the proper air temperature the heat in the blower housing is monitored by the cycling thermostat during normal operation the air temperature should be between 120 and 160 degrees Fahrenheit when the air reaches the proper temperature for your dryer the cycling thermostat will switch off the voltage to the burner assembly the high-limit thermostat and thermal fuse also monitor the air temperature again if there is an airflow problem the high limit thermostat may switch off the voltage to prevent damage to the dryer eventually if the airflow problem is not corrected the thermal fuse may fail and the dryer will not heat at all in addition to the fuse and high limit thermostat the igniter and flame sensor can also fail and prevent the dryer from heating if your dryer does not heat you should test all of these parts individually to determine if one of them has stopped functioning the gas valve coils can also fail but testing them can be inconclusive if at any time during the drying process you observe the igniter glowing and shutting off without establishing a flame then one or more of the gas valve coils are probably defective and will need to be replaced keep in mind the coils can fail several minutes into the drying cycle which will result in the dryer taking too long to dry as the blower wheel draws the air into the dryer and the burner assembly heats it the drum is rotated by a drive belt the belt goes around the entire drum and is looped down to a drive pulley on the motor which drives the belt and around an idler pulley which puts tension on the belt the drum has baffles inside to lift and rotate the clothes which is an important step in the process as it allows the heated air to dry the clothes evenly the drum is supported by glides or rollers in the front and rollers or bearing in the rear depending on the model over time the drum supports will wear out and the dryer may become noisy during use if the drum is overloaded or if a support roller glide bearing or pulley fails the belt may begin to slip it can also fray and eventually break when the belt breaks you may hear the motor running but the drum will not rotate on some models a broken belt will activate a switch that prevents the motor from running air flow heat and drum rotation are all necessary for efficient dryer operation and as you can see all three are interrelated if you're experiencing a problem with your dryer repair clinic has a solution enter the appliances full model number in our websites search engine for a complete list of compatible parts our site also has an extensive selection of instructional videos to assist you covering topics like part testing disassembly and part replacement at repair clinic we make fixing things easy

30 Comments

  • Lee Funny

    April 14, 2019

    Thanks for this video.. I understand now how it works

    Reply
  • Zavier The Great

    April 14, 2019

    That's kind of scary…

    Reply
  • Dan Webster

    April 14, 2019

    Very nice video send me my Tee shirt address is in my about section

    Reply
  • Zanimljiva Struja

    April 14, 2019

    Better is electricly heated dryer.

    Reply
  • joseph Norcal USA #1

    April 14, 2019

    helpful information, thank you for sharing !!

    Reply
  • Blaine Bugaski

    April 14, 2019

    So, semi rigid ducting is acceptable up to 20 feet, but basically every dryer has two 90 degree elbows. Once behind the dryer and one at the wall. So suddenly your semi rigid ducting is only acceptable for a 4 foot run????

    Reply
  • glb360

    April 14, 2019

    In my case a fuse blew because there was too much lint. Fuse and exhaust duct were replaced and lint was cleaned out of entire unit. Problem solved.

    Reply
  • Allbut Sweet

    April 14, 2019

    Super sweet got the dryer to work thanks a bunch

    Reply
  • Joe Black

    April 14, 2019

    Can someone help? I have a 2015 whirlpool Gas Dryer. The voltage on the dryer is 110v but the socket is 220v. I have a converter regulator to convert 220 to 110. The problem: My maid plugged the dryer in 220v (God only knows why she felt the need to pull it out of the 110v and put in 220v – we think she was charging her cell hehehe ) ANYWAYS – the dryer ran for a few seconds and stopped – nothing works. Is the dryer toast? or is there a fail safe to protect it? what should I inspect?

    Reply
  • Jessica McGinley

    April 14, 2019

    Your videos have been so helpful! I've already replaced a broken igniter and thermal cutoff. Still no flame so I need to test the cycling thermostat and flame sensor. I'm hoping either of those will fix it because I don't feel comfortable messing with anything gas related.

    Reply
  • RedDestroyer Gaming

    April 14, 2019

    I have a question here

    —> 2:31

    Which venting is used the most?

    Reply
  • Elizabeth Vollmer

    April 14, 2019

    Fantatstic and very useful- should be the basis of a class

    Reply
  • Neil Christian Langoyan

    April 14, 2019

    WE HAVE A DRYER LP GAS FED. 220 V. 3 PHASE. WHAT DOES IT MEANS? IS IT OK OR NOT?

    Reply
  • Andre West

    April 14, 2019

    This video was THE BEST! Simple, comprehensive, clear, yet concise and thorough! Good Job! Thanks so much!

    Reply
  • Xx_Braden_xX

    April 14, 2019

    What about the drive motor??

    Reply
  • Napoleon Blownapart

    April 14, 2019

    thats crazy! never tought they exist.

    Reply
  • Shinji Ikari

    April 14, 2019

    this is exactly what i was talking about cheryl

    Reply
  • carlos morales

    April 14, 2019

    thank you ..good video..

    Reply
  • orto claud

    April 14, 2019

    totally educational video awesome!

    Reply
  • matt dennis

    April 14, 2019

    Thank you. Very helpful.

    Reply
  • Mayor Fuglycool

    April 14, 2019

    +Noah R. Check out this video !

    Mayor Fuglycool

    Reply
  • Yaganzii Robert

    April 14, 2019

    what do you think is a better buy, electric or gas? in your opinion.

    Reply
  • Kill Bill

    April 14, 2019

    So a gas dryer still needs to be plugged in, in order to work? Do people prefer gas over electric?

    Reply
  • hector rios

    April 14, 2019

    thanks videos are great very specific and clear!

    Reply
  • Ngadirin Harjautama

    April 14, 2019

    Thanks, it is useful for understanding it.

    Reply
  • Levi Kleinschmidt

    April 14, 2019

    does carbon monoxide come out of the duct?

    Reply
  • Ron Second Amendment

    April 14, 2019

    Great video.

    Reply
  • 2StealthGTi

    April 14, 2019

    Great videos on the operation of front load washer/dryer.  Very insightful for things to be aware of.  

    Reply
  • RepairClinic.com

    April 14, 2019

    No problem!

    Reply
  • Gary Button

    April 14, 2019

    thanks!

    Reply

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