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Sounds like the thermocouple needs replaced. When ever the couple doesn't make enough electricity the gas valve is shut down automatically. Sounds like your thermocouple is right at the threshold of minimum voltage and doesn't generate enough voltage to keep valve open.
It may may be the safety system for pilot light is maladjusted. There is a sensor which has to be heated by the pilot light or the valve shuts down altogether. If the pilot light stays lit then you check to see if it is positioned to light main burner.
DISSCONNECT ALL ELECTRICAL POWER from unit before doing ANYTHING ELSE!!!!! Check all Gas connections IMMEDIATELLY!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Be certain non have come loose due to vibration during operation (check and retighten all fittings associated with this device). Should all gas connections be found properly connected & tight, refer to owners manual regarding pilot light. If pilot light has gone out, gas smell will be sensed in the area of appliance, even when NOT turned on! Should pilot be found to be lit..... all connection determined to be connected properly & tight..... IMMEDIATE action should be taken to shut gas supplying appliance OFF !!!!!!!!!!! Contact Professional Service Representative at earliest convenience !!!!!!! DO NOT APPLY GAS PRESSURE TO UNIT TILL ISSUE IS RESOLVED!!!!!!!! GAS CAN BE EXTREMELLY DANGEROUS and EVERY CAUTION SHOULD BE OBSERVED WHEN WORKING IN THE AREA to PROPERLY VENTILATE to open air source. DO NOT ALLOW VAPORS TO ACCUMULATE & AVOID ALL SPARKES & OPEN FLAMES !!!!!!
Check that the pilot light is lit and flame kicks on when dryer is activated. If no flame, then check gas valve. If only pilot remains lit but does not increase when dryer is activated, then you could have a bad coupler or sensor or circuit problem which would have to be tested with a voltmeter and/or test light.
No flame indicates that this is a gas dryer?
If so, there has to be either a pilot light, or an ignitor. If it has a pilot light, make sure that it is lit. If it isn't, the gas will not flow. The sensing bulb above the pilot light must be hot before it will allow gas to flow.
Dryer does not have pilot light. There is an ignitor that glows when the dryer is started and lights the flame when the gas begins to flow. With the front of the dryer off start it up and look for the glow. when it glows hot enough (or on a newer model it might be a spark) the gas should ignite. When the flame sensor sees that the gas is ignited it shuts off the ignitor and keeps the gas valve open until the temperature sensor gets high and shuts it off. When the temp sensor cools down the cycle repeats.
If no glow or spark-->bad ignitor
If no gas flow-->bad flame sensor or bad gas valve coil
If gas comes on and goes off quickly-->lint filter and/or vent pipe or outlet may be clogged or bad flame sensor.
If you have a pilot light (small flame) you can try to re-light it by turning the knob on the gas valve to the pilot position and pushing the knob down while lighting the pilot, you may have to hold the knob down for up to 30 seconds before releasing it. The pilot should stay lit and then turn the knob to the on position. If the pilot will not stay lit or the main burner will not light it could be the gas valve or the temperature sensor.