My CH compressor shuts off before reaching set pressure?

by Jim MacDonald
(Miramichi NB Canada)

I have a upright Campbell Hausfeld compressor Direct drive.

It shuts off at 50 PSI. I changed the pressure switch and that didn’t help.

Is there a thermal shutoff that may be turning it off?
Jim, please pull the cover on the pressure switch with the power off.

Drain the tank to zero PSI.

Power on, then run the compressor with the tank empty and drain closed and monitor the pressure rise and the pressure switch to see if it trips at the 50 PSI mark, will you?

Since you don’t indicate the model number, it’s pretty hard to check and see if there is a thermal switch, though there likely is one.

If the pressure switch trips to off when the compressor stops at 50 PSI, then it is still a pressure switch issue.

If the pressure switch does not trip, and the motor stops, then power is likely still flowing to the motor circuit, and that surely suggests a switch on the motor or maybe a motor capacitor issue.

There is a page on this site about checking capacitors if the motor stops again at 50 PSI yet the pressure switch has not tripped to off. Might want to check them.

Let us know, will you?

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