I have been running into same problem since early am today. We have AO Smith Promax PCV 50 100. The pilot will stay on by itself when thermostat is on pilot ignition, but when I turn the thermostat to any higher setting A, B, C, the boiler will come on for a few minutes and then shuts down taking the pilto light out along with it. Was wondering if paper clip would work for my situation. Since this is me first time, Would appreciate if anyone could provide more details on the steps.Thanks in annticipation.