My air compressor will not restart after falling below the restart pressure. Replaced pressure switch. It is somewhat sporadic. When it reaches pressure and the unloader valve releases pressure, then it will restart. But it will do that only sometimes. More often it reaches stop pressure, the compressor shuts off (doesn't unload), and then will not restart when pressure falls. It can then be manually restarted by pressing the reset switch on the magnetic starter. The new pressure switch came with a new unloader valve.
I would think so too, except that the new pressure switch has a brand new check valve. And the issue is exactly the same as with the old pressure switch & check valve.
See attached image. Was 1 number off on the model number.
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Last edit: 6 years 1 week ago by rlb8988@yahoo.com.
What you are describing is not a check valve. That is a schrader/unloader valve on the pressure switch. It only releases a small amount of pressure that is left over in the transfer tube after the unit pumps up. If you follow the small tube from the pressure switch to the tank, that is where the check valve is located. It is mostly in the tank and the tank must be drained completely prior to removal.
