About Air Compressors.com

More than 16 years on line helping folks with their air compressor problems!

You are here: Home / Kaeser SM 11 back pressure error

Kaeser SM 11 back pressure error

SM 11 the back pressure Error is preventing me from starting

by Josh
(Australia)

SM 11
SM 11

 

SM 11 gauge closeup
SM 11 gauge closeup

 

SM 11 air compressor
SM 11 air compressor

 

 

SM 11 gauge and plumbing
SM 11 gauge and plumbing

_____________________________

Fault code
by: Carl

Actually, thinking about it, i cant see the number on the bottom line of the screen? What number or letter is it showing when you turn the power on?

________________________________

Controller
by: Carl

Hi again,
Thanks for the photo. Sorry, i may have misunderstood, it looks like, as you said, the back pressure fault is as soon as you turn the power on, not when you press the start button. I can see on the screen of your Sigma basic controller the bottom line is illuminated.
Does it let you reset this by pressing the reset button (reset button is the red “Stop” button) if if it doesnt let you reset then i havnt seen that before, are all the electrical connections in properly? The connection into your vent valve? (Brass component attached to the separator with a hose going to the air filter) if all these connections are ok then you may have a problem with the controller itself which could mean you may need an HPC engineer to come along to look at it to “K-load” it which mean taking all software off and putting back on again. Or a new controller.
Let me know how you get on
Carl

_________________________________

Vent
by: Carl

Hi,
Im guessing you have a sigma 1 controller fitted and it has the words “back pressure” on the screen as opposed to a number on the bottom row of the screen as you would with a sigma basic controller?

Either way, the back pressure error is indicating that you have pressure in the separator tank (where the oil is).

Do you have a pressure gauge on this tank? If so then it should read zero on start up.

Attached to the separator tank is a combination vent valve where you should find a little ball valve which is used for keeping pressure in this tank and firing out the oil when you have an oil change.

Check that this valve is open or you will get the back pressure error.

Secondly, inside that brass vent valve i mentioned is a rubber diaphragm, it has been known for this to inflate so will not let the separator vent, replace the diaphragm (it comes in an intermediate service kit along with air filter, oil filter and filter mat)

Finally, again with the vent valve, do you have an electrical connection to it? Make sure you have voltage going to it?

How old is your machine? If you could post a few photos of the machine and the vent valve/separator it would help a great deal.

Try all the above and reply to this post to let me know if it fixes it.

Many Thanks

Carl

 

 


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

Subscribe to this page / comment / post
Notify of
guest
guest
7 Comments
Inline Feedbacks
View all comments
Herari
Herari
January 24, 2021 2:06 am

Hi my name’s Herari sir my compressor is Kaeser SM16 I wanna ask you how to solve when my compressor screen post (INTERNAL SOFTWARE ERROR).

Reply
View Replies (1)
Jim
Jim
September 2, 2020 10:05 am

Hi i have an issue with an SX8 with a sigma basic controller. It has an alarm code 3 which i understand is motor rotation/back pressure. I have meggared the motor all ok. The rotation is ok as i have seen it run. It ran for approx 10-15 minutes made pressure then runs unloaded then trips. I now cannot reset the trip. I have checked electrical connections all ok. Replaced diaphram and o ring in brass valve block. I’m stumped. Could it be the solenoid on the brass block? Or controller issues? The pressure guage on the separator vessel reads… Read more »

Last edited 6 months ago by Jim
Reply
Hasan Mamaadov
Hasan Mamaadov
June 13, 2020 1:08 am

Hi .I have also witnessed with the ” 0042 back pressure” alarm in our Kaeser ASD 32 air compressor.Sometimes it was possible to reset but most time not possible.Unfortunately i couldn’t find full service manual from google.Who can send me link to download service manual.Thanks in advance
 
 

Last edited 8 months ago by Hasan Mamaadov
Reply
View Replies (3)

Search here to find the specific compressor info you need!

The latest pages added to this site include…

  • The Porter Cable compressor tank is full, but I can’t get air to come out? – December 2020
  • The compressor appears to compress the air but there no air at the hose on a 921.166460 – December 2020
  • Bambi 75/250 won’t build air after being on its side – November 2020

Getting around this site…

  • About Air Compressors
  • Sitemap – About-Air-Compressors.com
  • About Different Brands of Air Compressors
  • Calculating CFM
  • Identifying An Older Air Compressor
  • Jim Graham

Troubleshooting a compressor. Issues common to all and by the compressor make.

  • Troubleshooting Your Compressor
  • Compressed Air How To
  • Picking A Compressor
  • Air Compressor Parts
  • What Is My Compressor Worth

To help you understand compressors!

  • Compressed Air Treatment
  • General Compressed Air Information

Disclosures etc.

  • Privacy Policy
  • Disclaimer & Copyright Policy
  • Contact About-Air-Compressors.com
Want to bragg about your gorgeous computer rebuild? We'd welcome it here!"

RSS feed information.

If you wish to be updated when new comments are posted, add: about-air-compressors.com/comments/feed/ to your RSS reader. Thanks.

© 2021 · about-air-compressors.com ·

wpDiscuz