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This unit will shut down if unloaded for a set period of time. Usually 5 to 10 minutes. This time could be longer if some one has changed it from the factory setting. There is a timer in the control box that starts counting down when the unit unloads. If it stays unloaded long enough for the timer to count down the unit will stop until the air pressure drops to the low set point on the pressure switch. It will then start up. If the unit loads before the counter counts down the timer starts from the beginning when it unloads again. This cycle continues until you manually shut it down or you stop using air long enough for the timer to reach Zero and shut down.
The unloader is designed to release the pressure in the discharge tube after the unit reaches set pressure. The unloader is usually located within the pressure switch and is enabled with a small lever opening a valve (some look like tire stem). You can verify if it is working by cycling compressor and listening for release of air after unit reaches set pressure. Some compressors do not have a built-in unloader relying instead on loose fitting parts to bleed out air. On these units, air leaking back from the intank checkvalve will cause problem of loaded/backpressure and the motor cannot overcome. Easy to verify if checkvalve is leaking; with pressure in tank remove the discharge tube at the checkvalve and spray soapy water. Clean or replace this valve as needed. Good luck
I share your frustration with the same machine. Mine is approx 3-4 months old and within the first month i had a leak at the base of the machine which was fixed under warranty. The following month the machine started leaving water in the base of the unit after the wash cycle was complete. LG claim it is an electronic fault in the circuit board. I have refused repair and am now claiming a replacement with them. I don't feel it is acceptable for a machine that's only 3months old to give problems such as these.
The drain hose under the sink needs to be tied up,above the point where it enters the drain pipe or disposal,water is feeding back into the unit,run the disposal more often also this helps prevent this from happening.
The burst of air you hear as the compressor shuts off is the cylinder unloading so it will not have to restart against a high pressure load. If the unloader is electrical it would explain the hum that you hear. This could be a normal function.