If they are broken or fail to seal your compressor can run forever without building up enough pressure needed to initiate a shut off.
Porter cable compressor not building pressure.
Here are a few more.
The fault from a defective reed valve prevented the system from getting sufficient pressure.
Air passed through the intercooler safety valve instead of going through its second stage piston.
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An air compressor that will not build pressure runs on long past the point where it normally would reach the cut out pressure level and stop.
The result is the compressor motor will overheat.
See if there are any leaks in the pressure switch system.
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Porter cable pancake compressor will not build pressure based on the comments and questions on this site about why porter cable pancake compressors will not build pressure it s an ongoing problem.