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Kenmore gas dryer heats up at cycle start, then no heat for the rest of the cycle

When I start the dryer cycle, either timed or other, the burner ignites and heats up for the first 5 minutes or so, then there is no heat for the rest of the cycle. The dryer tumbles fine, but only air dries after the first 5 minutes. I cleaned the vent and tube, and replaced the thermal fuse, but it did not solve the problem. I have a multi-tester and could check the thermostats and coils for the gas valve operation. Can you help?

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  • cbertforu Sep 06, 2008

    When I start the dryer cycle, either timed or other, the burner ignites and heats up for the first 5 minutes or so, then there is no heat for the rest of the cycle. The dryer tumbles fine, but only air dries after the first 5 minutes. I cleaned the vent and tube, and replaced the thermal fuse, but it did not solve the problem. I have a multi-tester and could check the thermostats and coils for the gas valve operation. Can you help?

    What voltages or readings should I look for the coils or thermostat(s)?

  • cbertforu Sep 06, 2008

    What voltage or ohms reading am I looking for to see if the flame sensor, or thermostat are not functioning properly? One of the solutions suggested that these components are possible causes for the problem.

  • cbertforu Sep 06, 2008

    Not completely, I need to know how to diagnose if the flame sensor or thermostat are not functioning correctly. What voltage test or continuity tests are required?

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The problem with your dryer is that the gas flame comes on first few times then quits and igniter keeps cycling on and off but never lets the gas go. Replace the coils on the Gas Valve.

Also ckeck the glow bar igniter, thermalfuse ( if there ) ,gas valve ,thermostats ,motor heat switch,timer selector switch or the sensor ...

Posted on Sep 09, 2008

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  • The thermostat tells the dryer to heat until the interior reaches a preset temperature
  • When the dryer reaches the pre-set temperature, the thermostat tells the timer to begin advancing.

    The timer advances until the interior cools, then the thermostat tells the timer to stop advancing, and tells the dryer to start heating again.
    so from the above illustration its the timer and the thermostat thats faulty
  • Posted on Sep 06, 2008

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    It can be a faulty gas flame sensor that is cutting off the gas, or a faulty thermostat.

    Here is a genereic diagram for a gas dryer.

    Posted on Sep 06, 2008

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    Obviously your gas valve is working, but I'm wondering if you have low gas pressure coming into the appliance or low voltage. Check the voltage at the coils during the first 5 minutes when the gas is on. The question is whether the gas valve is telling the gas to shut off due to high temperature or whether the gas valves are shutting off prematurely. Make sure the thermostat is correctly positioned and has no visible damage.

    Posted on Sep 06, 2008

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    No heat If your dryer doesn't heat, check these:

    Igniter
    Gas valve coils
    Thermal fuse
    Igniter Modern gas dryers use an electric igniter to ignite the gas from the gas valve. When it's working properly, the igniter glows bright orange. When it burns out, the dryer tumbles but there's no heat because the gas can't ignite. When the igniter burns out, you need to replace it. If the igniter is held by a tension bracket, you very well may need to replace the bracket too.

    The igniter is inside the dryer housing, near the bottom front, usually in a cone-shaped metal tube (the force cone). It's about 2 inches long. It's mounted to the far end of the burner tube, and it has two wires attached to it--or to the tension bracket, if there is one.

    Gas valve coils Watch the igniter. Does it glow bright orange, then shut off without igniting the gas? (When the gas ignites there's a large blue flame.) If so, there may be defective coils on the gas valve. Mounted on the top of modern gas valves, there are black electrical coils. The coils, when energized, open the gas valve. If one or more of the coils are defective, the valve doesn't open and the gas cannot ignite. Because it's often difficult to properly test the coils, it's usually best to replace both (all) of them at the same time.

    Thermal fuse On many dryers, there's a thermal fuse (a heat-sensitive fuse that blows if the dryer overheats) mounted to the exhaust duct inside the back cover panel. The fuse is about an inch long. It's usually embedded in black resin and mounted in a white plastic housing.

    If the fuse has blown, it has no continuity. When this happens, your dryer either just stops heating, or it doesn't work at all. Be sure to inspect the venting/heating system before replacing the fuse to put the dryer back into operation. (You can't re-set this type of fuse.)

    Posted on Sep 06, 2008

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