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two possible problems
the non-return valve at the tank on in the line to the tank is faulty or the poppet valves /reed valves in the heads have failed
if they are poppet valve s there is a very fine spring that keeps the valves on the seats and if reed valves they can split
in both cases the air is pumped from one cylinder to the other and back and so no air is sent to the tank
to get parts look for the make of the compressor on the crankcase and order parts from the manufacturer spares or dealer spares of the maker of the compressor
Sounds like the thermal over load in the motor is tripping and resetting. Cut the power and try turning the motor and compressor by hand. If either is tight, work and oil it to try to free it up. If neither is tight, the motor is probably bad.
you probably have other issues along with the check valve. If this unit has a VP in the model # you may have a bad valve in either head. You will need to remove the heads to check. Another problem may be the unloader. It is located behind the front frame cover and is attached to the crankshaft. I have seen these come apart. Now if this does not have the VP in the model # you may have the following problem(s). The aux. valve located next to the pressure switch may be bad causing pressure to be put on the LP head valve located just behind the air filter threads. If this valve is closed no air can be pulled into the LP head /cylinder for compression thus the unit makes no air. The aux valve controls this valve in the LP head. I have also seen these valves stuck shut. Also make sure the air filter is not plugged. Hope this helps.