The dry was getting hot but not for long, then not at all.

Once the coils for the gas valve got hot they failed and shut the gas vavle off, we ended up changing the coils which fixed the problem but part select held up there end of shipping out these parts which we could not get localy. so if your dry ignites some time and or not for long its either these coils or the cycling thermostat which will casue the same conditions because the the cycling thermostat controls the coil. good luck!