What does Kaeser warning 0011 W (oil filter clogged) mean?
Short answer: Oil filter clogged. If your Kaeser Sigma Control 2 is showing 0011 W — Oil filter 1 Δp ↑, the controller has logged a specific, documented condition. This page covers what it means, what causes it, what you can safely fix yourself, and when — and why — it takes a technician.
What exactly is the machine telling you?
Increased differential pressure across the oil filter — the filter element is clogged and should be replaced.
Which machines show this?
the wide range of current-generation Kaeser rotary screw compressors — ASD, BSD, CSD, DSD, ESD and related series — built since roughly 2011 with the Sigma Control 2, the industrial-PC controller with a text display and RFID access. It reports faults as a four-digit number plus a letter: 'A' messages are alarms that shut the machine down, 'W' messages are warnings or service reminders it keeps running through, with arrows marking whether the value went over or under its limit — so 0015 A is the airend-overheat shutdown while 0013 W just asks for an air filter. Practical tip: the same subsystem often has a W and an A code (0004 W before 0022 A on the separator); acting on the W message is how you avoid the A shutdown.
What causes it?
- Oil filter element clogged — increased differential pressure
- Filter run past its interval
Can you fix it yourself?
Yes, if trained — the change itself is routine, but only with the machine shut down, isolated, and fully depressurized per the operator manual.
Step by step — what to try, in order:
- Schedule an oil filter change with a genuine element.
- Perform it only with the machine shut down, isolated, and fully depressurized per the operator manual.
When do you need a technician — and why?
Crews not trained on this machine's depressurization procedure should hand the change over — the oil circuit sits on a pressurized system.
If it does come to a service call and you're in Nashville, TN or Birmingham, AL, we maintain independently compiled lists of local companies that service industrial air compressors — real businesses with verified contact information, none of whom paid to be listed.
Related questions
What does 0011 W — Oil filter 1 Δp ↑ mean on a Kaeser Sigma Control 2?
Oil filter clogged. Increased differential pressure across the oil filter — the filter element is clogged and should be replaced.
Can I fix 0011 W — Oil filter 1 Δp ↑ on a Kaeser Sigma Control 2 myself?
Yes, if trained — the change itself is routine, but only with the machine shut down, isolated, and fully depressurized per the operator manual.
When does 0011 W — Oil filter 1 Δp ↑ on a Kaeser Sigma Control 2 need a technician?
Crews not trained on this machine's depressurization procedure should hand the change over — the oil circuit sits on a pressurized system. Have a technician do the filter change if you are not trained on depressurizing this machine.
Verified against service documentation: Kaeser Sigma Control 2 documentation for 0011 W — Oil filter 1 Δp ↑ (airsolcan.com)