Product review (5 stars): Solved my problem of gas dryer not heating up.
Problem was that drum rotates (motor & blower works) but no flame, no heat (igniter did not come on). I checked to make sure machine was getting gas first. This problem could be caused by many things so do your diagnostics first. In my case I checked electrical continuity of all electrical components - all showed OK except 1 of the older coils, which is why I decided the problem might be there. One of the older coils showed "open circuit" so I discarded it. The coils control the flow of gas to the igniter via solenoids. They come as a set, so might as well replace both. These coils solved the problem - dryer now works fine. But every case is different. If you think the coils are the problem make sure you order the right ones for the right dryer - you must know the exact model number & make of your dryer. Hope his helps.