Compressor cuts on and off and not pressure

by Lisa Harris
(alabama)

My compressor cuts on and off with no pressure for the air pressure to work.I have a paasche d500.


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Bill says...

Hi Lisa. Have a look at the page linked from the Pressure Switch button on the Nav bar.

If your tank pressure is below the pressure switch cut in setting, and the compressor starts and stops at that pressure level with no tank pressure increase, that points to a questionable pressure switch to me.

Cheers,

Bill



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Compressor will not shut off ...

MY COMPRESSOR WILL NOT SHUT OFF AFTER REACHING MAX PRESSURE

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Bill says...

This normally indicates that your pressure switch has failed.

Get it replaced as soon as possible, as you have the potential for a serious problem if your PRV should fail before you replace the switch.

Cheers,

Bill

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Starts to build air then shuts down

by tracy
(berlin nh)

starts to build air then shuts down

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Bill says...

Starts to build air... for a minute, two, what pressure level in the tank, shuts down how... a bit more info would be useful.

If the pressure is building in the tank, and the unit shuts off (not blowing a fuse) before reaching the normal cut out pressure, and the unloader valve dumps air when the compressor shuts off, then your pressure switch is either set wrong, or is failing.

Cheers,

Bill


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Pro force compressor will not start

by Lindsay
(Wisconsin)

Power supply has been checked and the outlet works fine. When I flip the switch to turn my compressor on, nothing happens.

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Bill says...

Frustrating, isn't it?

Bleed the tank down to zero, and toggle the lever on the pressure switch, assuming there is one. Anything happen?

If you have power to your compressor, and nothing happens when you turn the on/off switch to on, and there is no pressure in the tank, then it's quite possible you have a failed pressure switch.

That's where I would look first.

Cheers,

Bill

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Compressor will hot shut off at pressure limit

by WILLIAM
(OGDENSBURG NY )

I have huskey h 150 3tp 3 gallon compressor that will not shut off at 155lb pressure. have replaced 3 pressure switches, so know it is not that that. sounds like it is not building up enough pressure to shut it off. I can run it for quite awhile and it won,t knick off the safety valve. WHATS THE PROBLEM? THANK YOU. BILL.

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Bill says...

What is the normal cut off pressure of your compressor? If it is higher than the 155 PSI yours reaches, then the problem is not your pressure switch.

The problem is that your compressor can't get the pressure level in the tank up to the cut out pressure level, whatever that is for your compressor.

You need to take a look at these page on why a compressor won't build pressure.

Cheers,

Bill

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sears 919-152920 air comp. but won,t turn off

by mark
(michigan)

sears 919-152920 air comp. fills tank ok but won,t turn off

model # 919152920
4hp 25 gallon tank
won't turn off automaticlly

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Bill says...

Mark, if your compressor won't turn off once the pressure in your tank reaches the normal cut off pressure, then continues to run until the PRV blows, you have a dangerous situation.

I believe that your pressure switch has failed, and needs to replaced immediately.

Cheers,

Bill

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Compressor is not shuting off

by Eugene
(Eckert, Colorado)

The tank has a PSI max.,of 175 pounds. I do not remember pumping up as high as it is. I have been turning it off manuelly at 140.
You can email me at eugenegab@yahoo.com
Thank You
Eugene

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Bill says...

Hello Eugene.

If your air compressor keeps running past the cut out pressure level, and the pressure level continues to rise in the tank past that level, then you need to replace the pressure switch as this is the symptom of a failed pressure switch.

Cheers,

Bill



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Jun-Air pancake compressor- wont shut off

by victor
(austin, tx)

I have a decade old Jun Air (wonderful, quiet, great pressure, but oil and maintenance are expensive) which i got from a life in a lab- now i use it in my shop.

I use it sporadically, many times I'll switch it on for a few minutes, use it and then shut it off.

But this weekend i had it on, and noticed its hissing, and not cutting off (the hissing seems to be coming from the regulator - not the PRV). I want to overhaul this thing, but a Jun-Air dealer wants $200. Where can i start myself?

How can i troubleshoot the Pressure switch? I'm handy and not afraid to make a mess.
Any help would be greatly appreciated.

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Bill says...

Victor, you have a failed pressure switch, and the hissing may mean that it's failed with the unloader valve open, hence the hissing.

Look under the pressure switch lid to see if it shows you the cut in and cut out pressures. Then, take that info and the pressure switch to a compressor repair shop and see if they can duplicate the pressure levels and the interface with the unloader valve.

If you want Jun Air manuals, check this page.

Cheers,

Bill

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Jun 07, 2010
Thanks
by: victor

Thanks for the feedback.
But knowing the Jun-Air compressor shop in Central Tx, they would likely charge me either way. Should i just plan on replacing it? Can i use a Non Jun Air pressure switch? ( i love the Jun-Air, but authorized service is pricey and overrated)

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As noted in the original post, "Look under the pressure switch lid to see if it shows you the cut in and cut out pressures. Then, take that info and the pressure switch to a compressor repair shop and see if they can duplicate the pressure levels and the interface with the unloader valve."

You can use any pressure switch that provides close to the same cut in / cut out pressures and interfaces with the unloader valve.

Of course, use of a non-Jun Air part may void any warranty you have on the unit, if any.

Cheers,

Bill

Jun 07, 2010
industrial compressors
by: Anonymous

thanks for a great blog, you covered the basics really well, if it helps you can out more about industrial compressors uk
at thebcas website, it's short for British Compressed Air Association. Hope it helps.

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My air compressor shuts off at 80 psi and will not kick on again untill o psi

by Wayne Thomas
(Chesapeake, Va)

my compressor was just rebuilt with a new motor and compressor. My air compressor now shuts off at 80 psi and will not kick on again untill o psi.

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Bill says...

Hi Wayne. That sounds like your pressure switch either has bad settings or has failed.

It's the pressure switch that turns the power on to the motor when the pressure drops to the cut in pressure level (often around 80 PSI in fact) and turns the motor off when the pressure reaches the high pressure cut out (often around 125-150 PSI).

If the pressure switch was removed and replaced, maybe the wiring is wonky?

Cheers,

Bill

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compressor operates intermittently

by norman Matkin
(Lawrencetown, Nova Scotia Canada)

When starting from zero the unit would charge to max.,i.e 125 psi and shut off as expected. But when the pressure reached 90psi the motor sputtered and would not restart and the circuit brkr popped. But if I bled the tank to zero the compressor charged up to normal max pressure but it would not automatically restart. I replaced the compression switch but things did not change. Also when the motor did cut off air was expelled as expected.

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Bill says...

Hi Norman.

From zero PSI, your compressor runs perfectly up to 125 PSI and stops at the normal cut out pressure level?

Then, you start using air, the pressure drops to 90 PSI, and this is the normal cut in pressure and your compressor tries to start at that pressure, is that correct?

If it were my compressor, and these summaries are correct, I would replace the pressure switch, and make doubly sure that it was wired correctly.

Cheers,

Bill

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