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Lennox used variable speed ecm motor on some of these furnaces. Look at the motor and tell me if has a bell on then with 2 plugs, one being a 16 pin plug.
OK that is as I expected, a true variable speed ECM motor.It is going to require a special tool to test the motor as it is high voltage powered but low voltage or DC voltage controlled.90 per cent of the time the issue is going to be in that bell on the end. If this is something you want to troubleshoot,I will direct you in getting the tester.
The tester determines if issue is in the control board or the module. You can remove the module from motor to test the motor but rarely the actual motor is the problem. The module is almost as much as the motor so often just as inexpensive to buy the motor/module combination.
The module or motor individually run around 500 bucks and the motor with module runs between 600 and 700 wholesale.
One note I might make is if furnace is less than 5 years old, this would be a warranty part.
90 per cent of the time the issue is with the bell controller on the motor.
Here is a link to a troubleshooting guide that will help if you want to troubleshoot it yourself
Let me know if I can assist further with troubleshooting
Motor is most likely ok, but yes the tester will tell you if it the module on motor or the control board