grumpa8637
New member
Not knowing much about these, and trying to troubleshoot. The unit is a Goodman, model GSC140361AA. Think I'm dealing with a locked rotor situation but will describe my findings to this point. When unit starts, fan motor runs fine but there is a hum from the compressor that comes and goes about every 5 minutes. It's sealed so can't see shaft. Making use of a borrowed "Fieldpiece" HS35 multimeter with power disconnected; the dual capacitor shows correct dual mfd ratings, compressor windings show 1.7ohms between the common & run winding, 1ohms between common & start windings, 2ohms between the run & start windings, no short from any one lead to ground. With power restored and using clamp on, compressor run winding is at 60A & start winding is at 4A. So here's where I'm unsure, is the start so quick that I don't see the 60A on the start winding? Thought I'd see it on both or the start rather than run. Additionally, not understanding capacitor operation, capacitor shows 340V to fan and only 120V to compressor. The capacitor is a "dual" type with a 370V rating, what should I be seeing on these? Any help or suggestion greatly appreciated.