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Sullair Compressor Fault Codes – Sullair Air Compressor Displaying Errors

Published Categorized as Air Compressor Displaying Error Fault Codes, Sullair 4 Comments on Sullair Compressor Fault Codes – Sullair Air Compressor Displaying Errors

A common problem with Sullair air compressors is Sullair compressor fault codes. This article will provide you with some useful information on compressor error codes, along with existing reader questions and responses about Sullair compressor fault codes!

Table of Contents

Reasons Sullair Compressor Shows Fault Codes

In the event of a system fault of some sort, the Sullair air compressor will likely display a fault code in the user operational display menu on its controller. If there is more than one fault active, each code will be displayed as separate items on this operational display menu; they can be viewed by pressing up or down.

Sullair Fault Codes

The fault codes displayed on the Sullair air compressor will typically be separated into:

  • Unit faults (ERR/ERROR)
  • System faults (SYS/WARNING)

Note that these may not be exactly as described above.

Error Fault

When the compressor displays an error or shutdown, the conditions of the error will automatically reset once the condition has been resolved, and the air compressor has restarted and works again with no issues.

System Fault

When the compressor displays a system alarm warning, the conditions will be automatically reset when the condition has been resolved and reset on the compressor.

It’s common for the fault codes to be separated in a way that some represent a problem or error with the controller itself which prevents normal operation of the compressor, and others represent system faults that occur externally from the controller and with the compressor.

The Sullair compressor fault codes will likely display their errors on the controller in two different light patterns:

  1. LED flashing slowly – this indicates an alarm warning condition where the compressor is continuing with the normal operation but user attention is required still.
  2. LED flashing fast – this indicates a trip condition where the controller will stop the operation of the compressor until the conditions of the error are resolved.

In most cases, the fault codes should be labeled with unique numeric codes which can then be understood from the user’s manual for the specific Sullair compressor.

Reader Questions & Responses

Sullair Compressor Fault Codes P1 – Sullair Compressor Troubleshooting


Recently moved the Sullair ES-8 compressor and as soon as I tried to power it up I got this error message:

2 64

Now it will not start at all.


Sullair ES8 air compressor
Sullair ES8 air compressor


A detailed visual inspection is worth performing for almost any problems which may prevent
unnecessary damage to the compressor. Always remember to:
a. Check for loose wiring.
b. Check for damaged piping.
c. Check for parts damaged by heat or an electrical short circuit, usually apparent by discoloration or a burnt odor.

After the electrical wiring has been done, it is necessary to check the direction of the motor rotation.
Pull out the EMERGENCY STOP button and press once, quickly and in succession, the (START) I and
(STOP) O pads. This action will bump start the motor for a very short time. When looking at the motor from the control panel side, view the coupling by looking through the air inlet duct on the lower side of the adapter fan housing. The coupling should be turning clockwise. If the reversed rotation is noted, disconnect the power to the starter and exchange any two of the three power input leads, then re-check rotation. A “Direction of Rotation” decal is located on the motor and cooler shroud to show proper motor/compressor rotation.

Let us know what you find, please.
Good luck.


P1 low means that once the unit is started the computer looks for the P1 transducer to register air pressure. A timer times out if not registering pressure it shuts down on a low P1.

The easiest problem is a bad transducer.

The supervisor should show the P1 value. What is that value? Is it 0? or is there a negative such as -10.

When you clear the fault and start the unit are you watching the P1 valve raise?

the other issue can be the inlet valve. If the inlet valve is closed and stuck closed the sump will not see pressure. That is a check if the sump pressure is not raising.

Since you stated the unit will not even start I would suspect the worst.

Maybe a drive coupling or snapped shaft or air end locked up. If the P1 transducer had a failure of a loose wire or the transducer has funny readings “out of range” the supervisor will tell you P1 error.

Sullair Compressor 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 on the info screen.

Today I started the compressor and got code low separator DP.

I shut the compressor down and then restarted it and have not had any issues yet today with the unit.

Low separator DP has shown up in the past from time to time.

Any input on fixing the issues?


DP could be the setting is too tight, or you may have a blown separator, or the oil pressure is too low, to begin with.


Ok, just to clear it up, DP means differential pressure, so the differential pressure is the pressure difference between the separator tank and the delivery pressure, if its too high, then it means there is a blockage (sep change required)

If it’s too low then it could be split (sep change required) what I can’t figure out is, that normally if the sep is split then it throws oil down the line, has this happened??

Sullair Compressor Fault Codes P1 – Sullair Air Compressor Troubleshooting


We are using two 3710/A type air compressors in our facility for rig drilling operations. We are facing an unusual issue with one of our air compressors which is displaying an error message as “Warning Not commissioned” on the WS controller.

Sullair Compressor Model 3710/a Control Screen
Sullair Compressor Model 3710/a Control Screen
Sullair Model 3710/a Label
Sullair Model 3710/a Label

We are using two 3710/A type air compressors in our facility for rig drilling operations. We are facing an unusual issue with one of our air compressors which is displaying an error message as “Warning Not commissioned” on the WS controller.

The maintenance indicator (amber LED) is ON but we are unable to find the right cause of this problem.

With regards to troubleshooting, we have replaced the air pressure regulator, the WS controller, Eaton fault relay, and I/O module 02250154-052, but the amber maintenance light is still ON.

We are unable to set the Unload pressure at 110psi and load delta pressure at 10psi. Currently, the unload pressure is 90 PSI and the load delta pressure is at 5psi.

Anyone can help with what we are having warning and how to reset this to fix it?


You will need a technician to hook up to the unit and reset maintenance timers. Also can adjust pressures there. But normally you should be able to adjust the WS controller.


If the IO module was replaced and not commissioned the machine does not know what parameters it was designed for and defaults to the lowest setting.


The module you have is definitely yet to be commissioned.

The commissioning of a new module requires a particular software from Sullair (called WSPC) and also the know-how of Sullair and its distributor to do so.

Just simply contact them to come down to do the commissioning of your I/O module.

If you have any questions regarding Sullair air compressor fault codes, please leave a comment below, with a photo if applicable, so that someone can help you!

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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