Gas dryer not heating properly?

Filed Under Dryer Repair

Clothes Drying

 

Gas dryers use a burner to create heat. This burner has a number of parts that are known to fail over time. You can test some of these parts, but some must be simply replaced based on certain symptoms.

The parts prone to failure in your burner assembly are:

The Igniter

The Coils

Or the Flame Sensor

How a burner works: When the motor begins to turn, the motor switch closes allowing a Burner Breakdowncurrent to reach the flame sensor. The flame sensor allows electricity to reach the igniter. The igniter then heats up to a temperature high enough to ignite the gas. Once the igniter is hot enough the flame sensor releases the igniter circuit which allows the current to run through the coils that open the gas valve. Gas then releases out past the igniter and lites fire and the heat is drawn into the dryer.

 

How to troubleshoot: Observation is key to troubleshooting a gas dryer.

Coil KitIf your dryer is hot at the beginning of the cycle but finishes cool then it is likely you have bad coils. As the coils age, they lose the ability to keep the gas valves open. This will sometimes cause the valves to open and close rapidly, resulting in a chattering sound. Unfortunately, the coils can’t be tested to verify the failure so replacing them is a decision based on the above.

Dryer IgnitorIf the dryer never gets hot, there are more items to check and test. The first item is the Igniter. There is a clear plastic connector attaching the igniter to the burner. Disconnect this and place your probes onto the two contacts of the igniter. The meter should read under 100 Ohms of resistance. Any reading above this means that the igniter needs replacing.

Flame Sensor

If the igniter passes the test then you need to test continuity on the flame sensor. You should have continuity between the two contacts. If not, then you need to replace the flame sensor.

If all of the above pass their tests, you need to make sure that there isn’t a build up of lint around the burner. Sometimes lint can block the flow of gas preventing it from igniting.

If you need more help with this, visit the Repair Forum.


Comments

7 Responses to “Gas dryer not heating properly?”

  1. Michelle on May 24th, 2008 3:48 pm

    Hello, I have a stackable Kenmore washer / dryer. The dryer is leaving burn marks all over my clothing. I clean the lint compartment before each drying cycle, but my dryer is still getting too hot.

    How can I fix this?

    Thanks ;o)

  2. Kevo on June 21st, 2008 12:36 am

    I have a 2002 Maytag Neptune dryer that will not heat. MDG5500AWW I had a repair technician inspect the unit and then tell me that the computer board needed to be replaced. I purchased the board from your site, installed it and the dryer worked when initially put back together; 1 time. The dryer will now not heat any longer. Do you have any suggestions? Also, I took the front door apart to check some of the sensors, coils, etc. I removed a sensor from the side of the heating tunnel (not sure what to call it) with a black and white wire and now I can not remember if the black wire goes on top or the white one? Can you assist in both of these issues? Greatly appreciated…….

  3. Ed on June 21st, 2008 3:37 pm

    My dryer heats up when it’s first started but when it stops for any reason or after certain time running it will stop heating. The igniter goes read hot and very bright but there is no gas ignition. I replace all of the sensors; temperature sensors and flame sensor and the problem still continues. I understand that it might be the coils on the gas valve. My question is how do I know that it is the coils and not the valve itself. I removed the gas valve and exited one of the coils and it works fine. The second coil it does not but if I switch the coils the one that did not work before works now and the one that did work befoer it does not in the new position. Is this an indication that the problem is the valve itself? I’m at a lost and ready to purchase a new valve (Part number 504091) but I wonder if the coils (Part number AP3094251) alone will do the job. Another question, if I purchase the valve Part number 504091, does it comes with the coils or I have to buy them separately? Please help.
    Thanks,
    Ed

  4. Todd on June 24th, 2008 3:27 pm

    Whirlpool LGR5636EQ3 Gas Dryer runs but no heat. Gas is on. I have checked the coil, igniter and flame sensor, all are reading less then 100 ohms. What next?

  5. fred matuszewski on June 29th, 2008 2:41 pm

    I have a Hot Point electric dryer that is not
    heating properly Model #nvlr333etowb,I would like
    to know what is the problem? Could it be more than one problem?

  6. bob on July 9th, 2008 12:09 pm

    gas dryer won’t heat. replaced the igniter and coils. igniter dosen’t get hot. help

  7. Mike on July 22nd, 2008 4:34 pm

    control panel does not come on but the power is on to dryer. does it need a new board or not. This is a whirlpool dryer duet model number GEW9250PLO

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