My Shinco air conditioner model# AP14000 is flashing P2. I found out that this may mean An over voltage, the motor may be working too hard due to a dirty filter. So, I cleaned the filter on the upper, back of the unit. I then plugged it back in, turned it on. It ran fine for about 5 or so minutes. Then it Beeped a few times and stopped. I repeated this process 2 or 3 times and the same thing happened each time. It flashes P2 each time. What do I do now?