I have a roughly 7 year old Pentair Minimax. It is used for both the pool and spa. It became gradually harder and harder to start until finally it would not start at all. It would try several times, and I could smell gas, but it just wouldn't light. I found this thread and saw the suggestion about cleaning the jets. I bought some wire brushes but then decided a more complete disassembly was warranted. I first verified that the blower was running, the ignitor was getting hot and I knew that I had gas. I turned off the gas, turned off the power and then pulled the gas jet assembly. Lo and behold, when I looked back up into the gas jets, most of the jets had cocoons, or spider silk in them... this include the jet closest to the ignitor. I cut the end off of a Q-Tip and cleaned out the jets. After reassembly everything works fine. The silk was fairly tenacious and I'm not certain that it could be properly cleaned without being able to look into the jets. In my unit I needed 1/4 and 3/8 box wrenches and sockets to remove the gas jet assembly. After the jet assembly was loose, I rotated it and the valve/regulator for access and cleaning of the jets.