I have a Danby DPAC8399 air conditioner, and its fan motor started acting strangely. Sometimes, it it will only do a hum and won't start, and other times it will do that hum for a few seconds and then start in the wrong direction. I can help the motor by giving a push to the fan so it starts in the proper direction. From these symptoms, I though the start/run capacitor was bad. So I measured it with a multimeter and it displayed 7.72 μF, which is in range for an 8 μF ±5% capacitor. Still, I replaced it just in case, but the motor is still having the same behavior.
Now I am wondering what to check next. Is there a way to know whether I have to replace the PC board or the motor itself?
Here is a picture of the motor and its plate:
In case it can help diagnosing the problem, I measured the resistance between the different wires (Updated with values measured while motor disconnected prom PC board):
|Red||11.2 Ω||15.1 Ω||∞||21 Ω|
|Yellow||5.1 Ω||∞||31.5 Ω|
The fan has 3 speed (Low, Med, High) and I measured the voltage between the ground and these wires for all the speeds:
The air conditioner has 4 modes (Cool, Heat, Dry and Fan), but I did all my test in fan mode only.
Picture of the PC board:
Picture of the PC Board on which you can see the capacitor at the bottom:
On the right of this picture, you see the 5 colored wires going to the motor. Outside these wires there is a ground wire, and an orange and a white wire going to the capacitor:
The original capacitor and its specifications:
I am also wondering why the black wire has infinite resistance with the other motor wires and has only 20 volts or less. And why the brown wire has only 0.5 volts or less? Does this look normal for such a motor?
Well, it was quite a bit of work taking the motor out of the AC. It is definitely not meant to be serviceable unfortunately. And no luck finding a centrifugal switch. See the pictures of the open motor:
Also, I am wondering what the symbol means on the brown wire on the diagram:
I ordered a new PC Board and swapped the PC Board, but that did not fix the issue. The motor still sometimes starts in the wrong direction.
I managed to find a new motor and swapping the motor fixed the issue.