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I have a Carrier Weathermaker model 9200 which is throwing an error code 31 for the pressure switch. After researching a bit online I found that one of the drain lines could be clogged. I pulled all three lines and they were fine, they didn't have any backed up water and I could blow through them. I then checked the fan motor which appears to be spinning fine when the system in on. It spins freely by hand when the system is off. Up in the furnace window I never see the glow of the starter. It apparently never gets to that point in the startup. Any thoughts? Don
File Name: Lennox 80MGF Mid-Efficient Gas Furnace File Submitter: kdog File Submitted: 08 Mar 2012 File Category: Appliance Repair Manual Pot Luck Supper Service Manual for Lennox Mid Efficient Gas Furnace Models: 80MGF2-45 80MGF2-60 80MGF3-60 80MGF2-75 80MGF3-75 80MGF4-75 80MGF3/4-100 80MGF4/5-100 80MGF3/4-120 80MGF4/5-120 80MGF4/5-140 Click here to download this file