Well, I hope you are luckier than we were. I noticed some time back that when the furnace kicked on, the fan ran normally for about 10 minutes and then it sounded like a battery drill that was running down. In other words, it started running slower and slower until it sounded like it was barely running at all. You could hear "pops" every so often, I later found out that this was because it was re-firing every so often because I wasn't moving enough air to keep the sail switch open and the flame would go out, only to speed up enough to re-fire. I finally got a technician out, he check everything and it was decided that the fan motor needed to be replaced. That happened today and I am glad it was them and not me that attempted this process. In my rig, the furnace has to come out to be serviced and hence the difficulty. It took the two of them 30 minutes to get it out...one on the outside and the other going in through the cold air return grate under my kitchen cabinets. The motor took another 30 minutes to be replaced and then to return the furnace they had to reverse the process but had to loosen the drawer rails and stiles to be able to reseat it in the proper place. Another 45 minutes. In all, they were here about 2.5 hours. The good news is that my total bill was only $300 and now we have steady heat and the system only takes about 15 minutes to bring the temp up to desired level instead of the previous 30-45 minutes. So, hopefully the efficiency is increased and my propane usage will go down