Compressor stops at cut-in level, why?

by Ken
(Bozeman, MT)

Compressor runs fine, until it reaches the cut-in level, then stops. If I hit stop switch and then hit start switch it will continue to run until it hits cut-out level, then it automatically starts and stops continuously until I turn it off.

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Mar 03, 2018
Early stop
by: Doug in s.d.ca.

Ken -

I agree with Bill, but you say "If I hit stop switch and then hit start switch it will continue...", which implies perhaps a mag starter or other larger machine. What make/model is this?


Mar 03, 2018
Compressor stops at cut-in
by: Bill

I understand this to mean that you are running your compressor from empty or low PSI in the tank, and when the tank pressure reaches the pressure level where the pump should cut in, if it were cycling between cut out and cut in, the pump stops. Then, if you start it again, the pressure will rise to cut out, you use air, the pressure drops to cut in, and the compressor will restart with this sequence as long as you are using air?

To my mind this has to be pressure switch related, and since that's not what's supposed to happen, if it persists and bothers you, change the pressure switch.

On the other hand, if otherwise the compressor runs as expected, why bother? Don't replace the pressure switch until it fails completely which may be in short order, or not for hundreds of cycles.

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