flame comes on but goes out after 3 minuets

flame comes on but goes out after 3 minuets. the dryer continues to run. if i turn the dryer off and let it set for 5 minuets or so it will repeat. flame lights and then goes out. have check all wires. everything is clean and looking good. replaced thermal fuse thinking maybe it was showing an overheat to early. thermistor is good (wouldn't run at all if not) but checked with ohm meter anyway. ideas?

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Hi,

Does the unit have a gas safety on/off valve? If a thermocouple is used you'll see a small copper tube (or in some devices an electrical wire) connecting the flame sensor to the valve. Maybe it is not sensing the flame and shutting it down. Or it is faulty somehow. Just a thought

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Gas Valve Solenoid

Gas dryers have two or more gas valve solenoid coils. The gas valve solenoids open the gas valve ports to allow gas to flow into the burner assembly. If a gas valve solenoid fails, the dryer won’t heat. To determine if one or more of the gas valve solenoids has failed, check the igniter. If the igniter glows and goes out but does not ignite the gas, the gas valve solenoid is defective. If one or more of the gas valve coils are defective, we recommend that you replace them as a set.

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