Quote:
Originally Posted by anthonygraff24
for testing purposes, we took the relief valve off of the compressor.
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This statement has me a bit worried. The relief valve is there for your safety and to protect the rest of the system from being over-pressurized, ESPECIALLY if your switch is failing to turn off the compressor. If your relief valve was venting at a lower pressure, preventing you from being able to tell if the switch was working, you need to calibrate the relief valve to vent at 120 psi. Please put it back on, calibrate it, then continue your trouble shooting.
You don't say whether your system is reaching 120 psi with the compressor running. I assume it is, but if not, this could indicate your regulator is attached backwards. There is an arrow on the regulator indicating the direction of pressure drop (ie, high pressure goes in the back of the arrow, low pressure comes out).
Jon's suggestion to check the gauge is also a good one. We've had some gauges (even brand new ones) that needed a "tap" to get the needle unstuck.