My dryer does not heat, I replaced the radiant sensor, beacause the igniter is working correctly, my next step will be replacing the gas valve coils and/or the thermal fuse. Could any one tell me how to test this components so I don't waist time trying to guess. Thank you.
The thermal fuse is easy to test. Just check continuity using a multimeter or ohmmeter. A lack of continuity means a blown thermal fuse.
The coils are difficult to test. You can use a multimeter or ohmmeter and check for continuity, but the problem is that a coil may be sticking open only after heating up, so you can see the difficulty this would present. If a coil is suspected of being faulty, it is best to replace both (all) at the same time. These coils are what permit the gas valves to open and they can cause a no light or a cycling condition. Really sorry for your trouble and I hope this helped. Best wishes.
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