150 l 220vac air compressor hums on restart
When I start the unit up from scratch, ie no air in tank, it start perfectly and builds up pressure to the cutoff point with no problem.
Then I use air......When the unit reaches the refill pressure point, it tries to start and the motor turns three or four times and them sits and hums. If I drain the tank completely, it starts up again correctly to the switch off pressure point, on second startup, it does the same things, motor turns a couple of times and the hums
Hope you can help