I have a Goodman propane-fired furnace GMS950904 CXA. Both yesterday and now today the circulator blower runs continuously but the furnace does not operate. The LED flashes six times, indicating an open in the rollout circuit. There are two rollout switches/sensors on the furnace that are stamped with L200F plus a pile of other numbers. Both times one of them (same one) tripped out (opened up). I reset the switch and things go back to normal until the next failure. I assume this a 200 deg F switch. Goodman's website was not helpful in getting a part number. The owner's manual offers these possible causes: flame rollout, misaligned burners, blocked flue and/or air inlet pipe, failed induced draft blower, loose or improperly connected wiring, faulty rollout limit switch. These are the results of my inspection of these items: no flame rollout visible during start up or steady state run with all furnace panels in place, no indication of burner misalignment, no blockage in flue or inlet pipes at their openings outside (don't know about the rest of the piping), induced draft blower replaced 2.5 years ago, bearings are quiet, nothing wrong with the wiring that I can see. There is no melted wire insulation, carbon deposits where there shouldn't be, mouse turds, etc. That leaves the rollout switch itself. I took both the rollout switches out of the furnace and set our kitchen oven at 180 deg F. I put the switches in the furnace for several minutes and then checked the switches. They hadn't opened up. Next up 200 deg F, still closed. I kept going up in 20 degree intervals. I had to go to 280 degrees to get the switches to open up. They both opened when I set the oven at 280. I realize this oven is not a laboratory instrument but I'm surprised there's that much of a difference between the oven and the snap action rollout switches. We live in Massachusetts so our furnace had a summer vacation. But October has been cold so the furnace has been running for several weeks now. If I had some air blockage problem due to critters building nests in the supply or flue pipe I would have thought it would have shown up by now. So what do I check next?

having issue with water into furnace, I can shut the furnace totally off and the water is still registering as going into furnace, the only way to stop the water meter is to shut off input to the furnace. anyone ever have this problem? water meter was checked and is working fine. and it must be because when i shut the water to the furnace off the meter stops totally