Hey Ductman! I'm a complete HVAC novice, I could really use your help. (forgive me if I'm not describing things properly)
I have a 2008 Comfortmaker (model FEM4X3600A). I Came back from vacation and the coils were frozen and the fan wasn't running.
After thawing and restarting the unit, the blower motor(GE X-13 ECM by Regal Beloit) would just vibrate. (not rocking back & forth, but vibrate and move the fan slowly in one direction at serveral-second intervals)
A voltmeter tells me I have 120 VAC on both legs at the motor, as well as 240 VAC across both legs.
Same thing at the transformer...120 on both legs, 240 across both...I'm getting 24 VAC across the secondary transformer windings.
I do NOT read any DC voltage at either the board or the motor...or anywhere else.
Could my board (diodes/relay) be toast?...Or am I barking up the wrong tree? (no visible damage to board)...incidentally, there are 2 diodes on the board...I get 36 VDC on both sides of one diode...the other diode reads 36 VDC on one side and nothing on the other
Am I even headed down the right road? Anything else I should be doing? (My brother is an electrical contractor, so I have electrical help)
Any help is greatly appreciated. Thanks in advance for sharing your expertise online.
Chris - Sarasota, FL