I have a comfort maker prj ii gas furnace also. What its doing is the blower will turn on, the glow ignitor will glow and as soon as the gas ignites it stay on fore about 10-15sec. And the whole heater shuts off. It repeats this every 30sec. Is the this the same problem which everyone on this forum facing or is this a different problem

I am having the same problems. They replaced my smart valve. Do you here any clicking on and off while it is trying to cycle?