Pop Off Switch not working properly

by Dan Garrett
(Tullahoma TN)

The compressor comes on runs a few minutes, when it builds to pressure, the pop off valve pops open before cutting machine off. Switch has an OFF and AUTO but it does not work without having to plug the machine in and allow it to build then unplug

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Aug 10, 2016
Pop Off Switch not working
by: Bill

"the pop off valve pops open before cutting machine off", sorry, I have no idea what you are talking about here.

Is it the PRV letting go, the unloader valve... what exactly is not working?

When you say "but it does not work without having to plug the machine in and allow it to build then unplug it", what that alludes to is the compressor pressure switch. If the pressure switch has failed closed, as in it is passing power (the points sometimes weld shut) then it needs to be replaced, but your description of the compressor issue is a bit difficult for me to understand. Try reviewing the troubleshooting pages.

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