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.
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.
The pressure switch is typically made with a rubber diaphragm which presents an opportunity for air to leak.
My experience with a porter cable compressor not building pressure was quite revealing.
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Even though the compressor motor might shut down due to it having a thermal cut off switch overheating the motor is never good.
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See if there are any leaks in the pressure switch system.
The fault from a defective reed valve prevented the system from getting sufficient pressure.
How to fix air compressor not building pressure easy fix.
The result is the compressor motor will overheat.
Air passed through the intercooler safety valve instead of going through its second stage piston.