The blowdown cycle must be completed before the system will restart.
The regulator is not sending a signal to the inlet valve. Check regulator.
Faulty seal in inlet valve. Machine shut down under a full load. Machine shut down with service valve open.
Faulty shaft seal. Faulty inlet valve.
There is too much moisture in the oil. Service the oil and the filter.
Check cooling fan. Check oil level. Check compressor speed – it may be too fast.
Check engine speeds; the engine could be running too slow. Check the compressor, it could be tight or seized.
Check blowdown valve. Check muffler at blowdown valve. Check pilot line for blockage.
Check the oil level, it could be too full. Plugged coalescing filter. Compressor running too fast. Oil is broken down – requires service. Check oil return line. Check valve on back of compressor.
The oil level in the sump tank lowers when there is air pressure in the system. All the lines that are above the sump tank will drain back to the tank when the system is shut off, giving the impression that there is more oil in the system.