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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7990
Experience:  Furnace, A/C and heat pump specialist.
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I have a G60UHV-36B-090-02 when i Start the heat cycle, it

Customer Question

I have a G60UHV-36B-090-02 when i Start the heat cycle, it ignites and the heater blower runs, but after the unit fires the heater and supposed to start the main blower, the main blower only runs in slow speed. It then shuts down and tries to restart, same cycle. If I turn on the fan only it just runs in slow speed. Sensor or motor? Start cap or is that built into the motor?
Thanks
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

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.

Customer: replied 1 year ago.
2 molex connectors, one 14 pins the other 4
Customer: replied 1 year ago.
pic
Expert:  airheatman replied 1 year ago.

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.

http://i.imgur.com/TnvwGV2.png

http://i.imgur.com/J7C6DhX.jpg

Customer: replied 1 year ago.
I can get the tester but what is the general cost of the ECM? Am I better off saving the $100 for the tester or just buying the ECM? I have no problem troubleshooting the issue if it will save me big bucks.
Expert:  airheatman replied 1 year ago.

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.

http://i.imgur.com/wTdlh9a.png

Expert:  airheatman replied 1 year ago.

Here is a link to a troubleshooting guide that will help if you want to troubleshoot it yourself

http://www.mediafire.com/view/1p9oo8lxwy4p19o/Ecm_motor_servicing_guide.pdf

Expert:  airheatman replied 1 year ago.

Let me know if I can assist further with troubleshooting

Customer: replied 1 year ago.
I really need that tester to verify if it's the ECM Module, motor or control board?
Expert:  airheatman replied 1 year ago.

Motor is most likely ok, but yes the tester will tell you if it the module on motor or the control board

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