I have an 18 year old Tempstar 93 percent high efficiency furnace, running on propane. I believe I can get all the model numbers if needed. The blower keeps running on this thing after the burners go out, and after some forum research, I found that tapping on the limit switch it would shut off and back on as needed. I am very much appreciative of the forums here. The switch is a BC-1546-AA which is now obsolete but with some replicas for replacements, so I went ahead and ordered one ($169.00 + = ouch). I had some information that there may be some contacts in those things that could be cleaned to crutch this along for a while, waiting for parts, etc. I dismantled it and found a circuit board with transistors, resistors = whatever they are called - I'm not real savvy about that stuff. But when I had it apart some of these things are obviously fried and melted together. The problem started this year with the initial startup of the furnace, but the blower had been running this summer with the AC and no problems. Aside from the tapping on the switch and getting it going and shutting off, everything else is working well and pretty normal. The question is: whether the fried parts in the switch would just be the normal wear out of those parts or should I be concerned about something causing that failure? The cost of maintaining this furnace has really only been two surface igniters, filters/cleaning, and blower motor oil for almost eighteen years so there's no whining about a $200.00 investment now. But if there is something else I should check, it would be great to get any information the subject. Appreciate the help, Bob

I just bought an older house that has the original gas furnace and what I think might be the original water circulator pump for the hot-water baseboard heaters. Circulator pump is making a high-pitched whine when the furnace first turns on. A repair guy said the circulator had an issue with ball bearings and that it would soon get louder and then die. He said the noise was a sign that it was "on its death bed," but he didn't even take a close look at it! I heard that you can simply put oil in the thing, and it might fix the problem. Anyone know if that's true? I'm strapped for cash, and don't want to replace it if all it needs is some oil--especially because the replacement he was offering to install looked like a cheap piece of work, and the warranty was only for three months! Could this problem be solved with oil, and where do I get it? Most importantly, where do I put the oil? The pump is an old, red cylindrical shaped Taco pump.