Sullair Air Compressors – Information, Manuals, Service Locations

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Sullair air compressors are rotary screw compressors. The company manufactures what they call Stationary Power, Portable Air Power and OEM type air compressors. Looking for information on Sullair compressors, or a forum for troubleshooting. You have arrived at the right site. Read on.

Within their Stationary Power line, they offer the industrial and manufacturing markets compressors, dryers, and other accessories to help delivery compressed air to those markets.

They are also big in what they term as Portable Air Power, and by that they mean what I refer to as Tow Behind type air compressors like the model 750 H shown in the photo.

For those looking to have a compressor manufactured for them, Sullair compressors offers their OEM line and they will build a compressor to suit your application.

Sullair ES8 air compressor
Sullair ES8 air compressor

Sullair compressors are sold world wide. They have been building rotary screw compressors and systems since 1965, and have manufacturing facilities in the U.S., in China, and in Australia.

In North America, Sullair compressors can be reached here:

Sullair, World Headquarters
3700 East Michigan Boulevard
Michigan City, IN 46360

This page is here to allow folks to ask questions about the Sullair air compressors in the OEM, stationary and tow-behind models to help other users of the Sullair brand.

Sullair 185 air compressor
Sullair 185 air compressor

Got a question about your Sullair air compressor? Before posting it using the forum you may want to read the existing submissions as your question may already be answered. Consider viewing the troubleshooting pages on this site too, as solutions to many compressor problems can be found there.

If you can help another Sullair compressor user by commenting on an existing post, that would be a great help for them and other Sullair air compressors users.

If you have questions about the Sullair 185 see this page.

If you have any questions about the Sullair 375, here is information about that model.

Thanks to questioners and all those that help providing answers.


Existing questions and answers about Sullair Air Compressors:

Sullair always waiting for blowdown

In automatic and manual, the compressor will not start, saying it is waiting for blowdown.

Sullair shutting down

I start on the engine it run fine but when we press the button of the compressor it shutdown

Understanding some Sullair fault codes

Recently i changed the oil and all filters in our compressor, The next day it shut down with the code low line pressure

Sullair Not Commissioned warning

We are using two 3710/A type air compressor in our facility for rig drilling operations. We are facing an unusual

Sullair 185 won’t start

Sullair 185 will turn over but won’t start even by spraying a little starting fluid in breather.

Sullair LS-100 pressure relief valve

When I start the unit now, the sump pressure starts at 135 and rises rapidly-until the pressure relief valve opens.

Sullair has high sump pressure

Sullair compressor is reading around 140 psi sump pressure while unloaded and blow down valve

Sullair getting P1 Low error

Recently moved the Sullair ES-8 compressor and as soon as I tried to power it up

Sullair sullicon blowing air

Oil haze is coming back up through air filter during shutdown

Sullair compressor blowing oil

Oil in air filter – setting Sullicon control to inlet valve

Sullair 185 keep shutting down

Sullair 185DP0CA keeps shutting down

Sullair 185 alarm went off

Low engine oil pressure alarm went off

Sullair 185 getting flashes

Getting 3 flashes from the SSAM

New comment? New question? Please add it here along with photos to help others help you with your compressor and equipment problem!

By Aidan Weeks

A passionate Mechanical Engineer with endless enthusiasm for fluid power - building off the back of over 18 years of high quality contribution and discussion stimulated by Bill Wade here at About Air Compressors. With both practical and theoretical experience in pneumatics and hydraulics, I'm putting my knowledge to work - and working my grey-matter through my research, assistance and publishing work here at About Air Compressors. Feel free to reach out any time! P.S. A HUGE shout out to Doug who really offers such great value to all visitors to About Air Compressors - once again, feeling like I'm standing on the shoulders of GIANTS by getting to work alongside such a great community

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My air compressor temperature is fluctuating from 178 to 210, which seems excessive.

Couple things-
What model?
Is that engine or airend?
And farenheit, I presume?

motor driven

That does seem a bit wide…is it maintaining 125psi?
Is the fan coming on, and the filter clean?
Is it set to modulate, or load/no load?
Finally, have you compared the range of discharge temp to the internal temp?
If they rise and fall more or less together, it might be the thermal valve next to the fluid filter is acting up.

Good luck!

PS1 is 100-110
Reads loaded and modulating when at 100 psi and then unloads at 110 psi but now temp. is up to near 220 degrees.
Filter is clean.
How do I check the thermal valve?

“PS1 is 100-110” – hmm, was it adjusted down? that model is supposed to run at 125. 1807 is 100. Probably irrelevant.

Filter clean, FAN?
anyway, when the temp goes over about 185, the oil cooler should start getting warm(er). Works the same as an automotive thermostat.
So if it gets to say 200 the radiator ought to be quite hot. If not, then it’s the thermal valve.

BTW, have you verified the input power voltage and connections along with fan rotation direction are OK? Might not be a bad idea.

So I checked the oil level with it off. There are two sight glasses, currently the lower sight glass is half full, it appears we are losing oil as I had the level to half full on the upper sight glass. The manual doesn’t reference the upper sight glass, do you know which sight glass we are supposed to fill?
Also, I did dial the PSI down when it was running hot in hopes of bringing the temp down, should I raise it back up?

“The compressed air/fluid mixture enters the separator/sump tank and flows through an internal baffle system. The direction of movement is changed and its velocity significantly reduced, thus causing large droplets of fluid to form and fall to the bottom of the separator/sump tank. The fractional percentage of fluid remaining in the compressed air collects on the surface of the separator element as the compressed air flows through the separator. A return line (or scavenge tube) leads from the dry side of the separator/sump to a medium pressure region of the compressor unit. Fluid collecting on the bottom of the separator… Read more »

Got a compressor that heats up rapidly when started but is not low on oil. Any possible causes?

Could be a clog in the oil line between the reservoir and the air-end. It’s making pressure, right?

Sullair 3709V showing Fault ANO Sensor, anyone know what this is referring to?

That’s probably AN0, isn’t it? Just a guess, maybe annual maintenance?
You should have a manual for the WS Controller, but I don’t have one, sorry.

I have a 2007 375 h only has 338 hrs on it 4 cyl cat engine my question is is that is it suppose to be building air as I try to turn motor over air starts coming out of the bleed offs on oil tank and air end any help would be greatly appreciated.

Sounds like maybe the unloader is stuck open. Somewhere not too far past the intake filter.
Does it start?

I have an old Sullair 100Q; has been working well but started recently, it build pressure on the gauge then idled down but only very low flow volume coming our from receiver. What’s up?

Clogged intake or separator filter. Does the engine rev up while you have flow, but the pressure/flow drops anyway?

Thanks for getting back with me. There really isn’t much flow. If I hold my hand over the outlet there is some pressure but the volume is almost nothing. Mine is an older model with no warmup switch. The engine starts in higher rpm, the gauge shows pressure buildup, then the rpm idles back like anytime when you close the outlet. I will check everything again to make sure there is nothing clogging the air intakes, like a mouse nest or something. I did recently drain the separator/receiver and replace filter and fluid but it did run okay after that.

I checked the air intake and there were a couple of small paper wasp nests. I removed them and cleaned the filter element but flow did not improve. Not much suction on air intake; of course if something is blocked on the outlet side there would be no place for air to move to. When I changed filter and fluid, I could not find Dextron II so I used Dextron III/ Mercron. Would that make any difference? It did run okay after the change but did not get much use before things stopped working.

Dexron II vs Dexron III
Depends. Could. Most Dex II was made with a base oil. Likewise, most Dex III is a synthetic.
So, if you had oil base in it, and put synthetic in, you’d need to flush the oil base out.
Otherwise, AFAIK, it should be OK.
You say you changed the separator? You might want to check that the scavenger tube isn’t clogged or bottomed out.
Does it seem like you have actual pressure when you first open a service valve, and then when the flow is low, what pressure is shown on the gauge?

buenas tardes, tengo un compresor sullair 750, al encender me sale en el display el error P1,2,3, por favor me gustaria saber a que se refiere este diagnostico. gracias por su atencion

P1,P2,P3 Signal Error Shutdown
Error Loss of all transducer inputs during run phase
Check voltage source and ground for good connection.

(transducers need 5V input)
You can find the manuals on-line.

I have a sullair 10b-40 older model. I rebuilt the sullicon due to a tear in in it. Replace the check valve.

When un-loading it does not pull back to close the butterfly. Keeps sump pressure high and blowdown works. It trys real fast to pull back and then lets go. Any suggestions or ideas ?

Thanks, Steve

(Post moved to the Sullair page – Moderator)

So, then what? Does it repeatedly try to unload, or cycle/sputter trying, or what?
Can you monitor the solenoid voltage or current while this is going on?