I have a Weil-McLain HE-6 Series 2 boiler (about 18 years old) that tries to ignite but sometimes go through a few cycles before turning on. Sometimes it tries to ignite and the flame immediately goes out other times it will try to cycle on and then go through the pre-purge process before lighting. I had my plumber check it out yesterday (he tested all components and they check out ok). He told me that he spoke to a friend having a similar issue and they replaced multiple components (one by one) trying to resolve the issue. After replacing many components it did not resolve the issue. My plumber mentioned that he tested the gas and it came in at 7lb/in but fell 2lb/in when the boiler cycled on. Not sure if this is a symptom or where to go after this. I told him about this board but unfortunately he did not have i-net access to post a msg so I offerred to post for him describing the problem the best I could. Any ideas I can pass along to him?