
12-11-2007, 09:38 PM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 5,307
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ok, restore power to the unit, then power it down. if the capacitor is good, shorting across it should give a clean sharp spark. Use an insulated screwdriver. don't use the meter it could fry it!. with your meter hopefully an analog meter, set your resistance test to RX1. place the probes across the cap. if it is good it will go upscale then back downscale. reverse the leads and touch the cap again. again it should go upscale then back down. if you get this indication then the cap is good. check your control fuse(s) might be a glass fuse might be a cartridge fuse. your control is 24 volt?? or 120 volt?? - Power up the system and check your input to the control transformer, then the secondary of the transformer. if you can get to the movable pole piece of the fan contactor try pushing it in with something insulated. if the motor is good it will start. if it just hums, a start winding might be shot, or the cap might be open. (if it tested ok as above) then yes the start winding might be at fault.
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