I have a Lennox G60UHV-36A-070-07. Problem was fan noise. Original parts: GE ECM 2.3, 1/2 HP, 1 phase Stock nbr 5462, 5SME39HL0252 120/240 V DATE CODE F0.7V CLASS B Module: Ge ECM motors by Regal Beloit 120/240 V 6/11/07 The only other info on the module is on the bottom, Lennox Part No: 18M8001 ECM 2.3 CN03 The repairman, replaced the motor and module, $500 plus $300 labor. (I believe a refurbished one) Problem: the fan motor ramps up and down continually. No air out of registers. The burner ignites as usual after a minute or so, then cuts off. The module was supposedly programmed for the motor. I'm not sure, but he may have tried another motor module with same results. The control board of the ECM module shows no blemishes or burn marks on any part or solder. I wonder if the thermistor could still be bad, causing the ramping up and down? Repairman recommended replacing the main control board next. My thought, if the original problem was the motor, why would a new control panel fix this? I've checked a lot of troubleshooting online, most beyond my expertise. I considered buying a motor and module on ebay for cost savings, but most modules are CN02, not CN03. Is this important? Does the module have to be programmed for the motor or for the Lennox unit? I saw a single post on a troubleshooting site asking about the ramping problem but there was no reply. Can you suggest possible problems, parts to replace, etc, for the ramping problem? Testing that would resolve this? I'm not a fan of continued replacing parts without knowing the problem, but my own expertise is minimal.

Hello, everyone! I am trying to fix my old gas furnace with electrical ignition for a while, and am seeking help from all of you. The furnace started to have problem this winter. At first, what happened was it failed to start some time, about once a week or so. The fan kept blowing cold air, but there was no ignite fire. As soon as I restarted it by removing and install the front panel, it would run for a few days. What I noticed it that the inducer fan had trouble to start some time, and I heard quacking noise when it ran. So I replaced it. Now it works fine during day time. However, it has trouble to heat up the room in morning. I set temperature to 68 during day time, and 60 during night. In the morning, the temperature will only raise to about 67 degree. The furnace is still running, but only blow cold air. I find that the pilot fire runs fine, but obviously the smart gas valve is shut off. However, I can restart it without problem by removing and install the front panel. The air filter is a new one. I feel that something turned off the gas after the furnace runs for a while What could cause the smart gas valve to shut off after running for a while? Any help will be greatly appreciated.