[mwjenn]

I have a Carrier 58UHV060-12 Natural Gas furnace. The ICM blower module failed and was replaced. This in not a PSC ( Permanent-split-capacitor) motor. My first question is, if you apply power (120 VAC) to the 5 pin connector terminals and leave the control plug ( communications, 16 pin connector) REMOVED from the motor what should the motor do? Run at full speed or not run at all. Everywhere I have researched I have not found anywhere that it should run until you hook up common 24 VAC and G ( fan), but a local HVAC contractor tells me it should run. This answer will determine where I proceed from here.

 

[yuri]

It needs a 24 volt signal to tell it what speed to run at. Has different speeds for heating and cooling and continuous low. Normally continuous low is energized by G. Right now it is waiting for a signal (ET to call home).:wink2:

I doubt it should run at all w/o that 16 pin connector hooked up as it would not know what to do and if it ran full blast could overspeed etc.

There is a way to test it with a simulator device GE has or you can put voltage to the pins if you are very careful and know how. This video has the procedure.

https://ca.video.search.yahoo.com/v...&sigb=12s8pj6ui&sigt=10ld3f1vi&sigi=12b848lq8

 

[mwjenn]

that is my thoughts also, but it just does not state anywhere. I have seen this video before along with others. I had bought two modules and both acted the same way, apply power with the control connector removed and the motor runs at full speed. I returned the first and got a replacement and the replacement acted the same way, hard to believe that two brand new modules act the same way and both are bad so I just wanted to make sure I was not thinking incorrectly.

thanks