I have a Danby DPAC3899 where fan will not start on its own, Fan capacitor checks out OK, fan will run once its push started, but will not start on its own, just "twitches" back and forth a coup0le of times. Brushes maybe?
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Re: Danby 3899 Fan does not start
I'm not an AC guy, but I had a similar problem with an AC unit at home it turned out to be the motor itself. Another time it was the relay. Did you try tapping the motor when on to see it it would turn?
In my case I used to whack the motor and after a couple of times it would turn, until it just wouldn't work anymore.
I sounds to me like the motor/ brushes, since it runs after being pushed.
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There is no start capacitor, but there is a RUN capacitor. More than likely it will be a 'combination' run capacitor that shares the common terminal of a dual capacitor with a higher mfd side for the compressor. Typically a 35/5 or 40/5 rating is what you'll see on the side of the capacitor. It will be grey in color, possibly round or oval and near the size of a soda can.
What you are describing is a motor trying to start without the aid of its run capacitor, which momentarily allows a bit more amperage flow through the start winding than it does once the motor starts. This is what 'charges' the run capacitor, so turn off the power, note the position and terminals the wires are on, remove them with insulated pliers and short across ALL terminals to drain the potential charge before touching the spade clips with your bare fingers. Remove the capacitor and read the rating on the side for replacement. Contact just about any local HVAC company for a replacement or go to WWGrainger's website and see if you can buy one retail from them.
The three terminals will be marked 'C' for common, 'Herm' for compressor and 'F' or 'Fan' for the condensor fan. If you get any wire in the wrong place, you could potentially damage the compressor or the fan motor.
Unlikely to be a capacitor but they aren't expensive to replace. More likely to be compressor failing to start, or controller faulty. Try powering up the compressor and fans to see if they run independently of the controller
It can be the start capacitor,or the fan itself can be bad,replace the start capacitor,then if this does not help,replace the fan motor,sense you can start the fan by hand,and it runs for hours,it must be the start capacitor.
possible faulty fan or fan capacitor I'd change can capacitor first if runs there's your problem solved. also if your pretty handy, apply direct power to it if should turn on if good if it does turn on suspect a faulty board or selector switch