First time poster here. Amazing forum and Thank You to those who are knowledgeable and put forth the time to help out the rest of us homeowners. I just returned from a deployment last night and for the past 9 days of cold weather my wife and kids have had no heat. It's my #1 priority to get this fixed. Initial issue was when she came from work and the house was colder than normal. Turned up the heat and nothing. She investigated found the pilot out and tried a relight procedure unsuccessfully and after smelling gas in the furnace closet, she called the gas company and they shut it all down and immediately told her to replace the gas valve. She assumed they knew what was up and she dropped the $200 and between her Dad and a friend replaced it. After that the pilot would light but no burners. She called out a friend with HVAC experience and he said it's a bad circuit board. She dropped another bunch of money to replace that. Same issue..pilot lights...flame sensor warms up and then a bunch of weird clicking from the gas valve like it's trying to send gas down. Another person tells her it may be the thermostat...she goes out and gets a new one. The fan comes on when you tell it to with the thermostat and pilot attempts to light when you command heat so I can only assume all their wiring is all good. Before you tell me why did she keep throwing parts at it remember at this point in the story I'm a million miles away and her and the kids are freezing. Two days ago before I got home someone mentioned the pilot orifice may be plugged so her dad cleaned it...no change. Fast forward to today when I get home. I could not even get the pilot to light. I took the ignitor off and orofice out and inspected it and put it back together and it finally lit and I had the same thing after about 45 seconds...lots of weird noises coming from the brand new gas valve which according to my wife sounded exactly the same with the old valve. EDIT... Found this video on Youtube...this is exactly what ours was doing today when I got the pilot lit. [url=http://youtu.be/4TisC2jn4dY]Payne Furnace Not Lighting - YouTube[/url] EDIT...I also want to add that whenever I do a call for heat with the thermostat the very first and only thing that is happening is the ignitor starts clicking. All the Youtube vids I wathed had the inducer motor coming on for a few seconds and then the ignitor clicking AFTER the pressure switch had been made. While holding the door switch in with a call to heat the the LED just flashes once quickly over and over. I called and paid for a "professional" to come out and he jumped the poles on the main board and used the cover safety switch to actuate it. He immediately said..well here's your issue your inducer is not starting. I read the sequence and assumed it started at the same time the gas valve opened to light the burners??? The fan spins freely and he tested voltage in and out and said the fan control board was bad. He quoted me nearly 5 times what I could buy the part for here in town so I sent him on his way and replaced it in 10 minutes myself. Motor is still not running ever during the start sequence. Now my questions..when does the inducer fan in Payne Model 376B Year 1988 supposed to come on? Reading the sequence of events it makes it sound like nothing can happen until it does, but I had the pilot going today, the clicker stopped and after about 45 seconds, and it started making the funny noises so I think the flame sensor is functioning. Is it supposed to start immediately in the sequence? As of right now I cannot even get the pilot to light again. You can hear the gas valve open, the clicker is making a nice blue spark, and you can smell gas but it won't light. :wall::wall: To recap...Right now the pilot won't light, the inducer fan is not running while it's trying. We've replaced the gas valve, main circuit board, thermostat on the wall, inducer motor control, the pilot orifice is clean, the inducer fan spins free. In the morning I plan to check voltage at the output of the inducer motor board where the motor wires connect to rule out the motor itself being toast. Sorry for the long post but I'm desperate. Were $600 into this..have paid several professionals look at it and every person has said replace a different part. About the only thing left is the inducer motor but buying these non returnable parts the week before Christmas that don't fix the issue is really getting old!! I also now have to figure out why the pilot is not lighting after having it going earlier today...separate issue??? Who knows. I'm at a loss. :help: Thanks for any replies in advance!

Starting earlier this week I've noticed that my heat upstairs wasn't working and I was getting an error for "Primary/Secondary Limit Switch" on the LED diagnostic. What was happening is the furnace (Lennox G24M3-75A-12) is firing up but I noticed the blower isn't working and then after a minute or so the furnace shuts down. I have so far replaced the primary limit switch thats on the front in the heat exchanger and the secondary limit switch thats on the back of the blower. Further research showed that it might be the run capacitor so I brought one today. Installed it and viola the blower came on after a little bit. I let it run for 5-10 mins and I think its fixed, warm air coming out of the vents and everything. When I go to button everything up though it turns off and shuts down giving me the same error. It seems most definitely blower related as I have replaced both limit switches and the capacitor and when I replaced the capacitor I saw some life from the blower. Anyone have any suggestions or ideas about what it could be? I saw a Youtube vid where the guy said to test the blower motor with an ohmmeter and I did. Readings were fine 3.x, 5.x, 7.x and 7.x. It should be noted that when I turn on just the fan or the AC at the thermostat that the air and blower both doesn't come on but the outside AC unit does.