What does Kaeser warning 0026 W (oil change due) mean?
Short answer: Cooling oil change due. If your Kaeser Sigma Control 2 is showing 0026 W — Oil change h ⇞, 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?
The maintenance interval for the cooling oil has expired — an oil change is due.
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?
- The cooling oil's maintenance interval has expired — an oil change is due
- Nothing is broken; this is the hour counter doing its job
Can you fix it yourself?
Yes, if you are equipped to safely drain and refill with the approved Kaeser fluid; reset the counter afterward.
Step by step — what to try, in order:
- Schedule a cooling oil change with the approved Kaeser fluid.
- Reset the maintenance counter after the change.
When do you need a technician — and why?
Teams without the equipment or the approved fluid should book service — the wrong oil or a bad refill costs far more than the service call.
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 0026 W — Oil change h ⇞ mean on a Kaeser Sigma Control 2?
Cooling oil change due. The maintenance interval for the cooling oil has expired — an oil change is due.
Can I fix 0026 W — Oil change h ⇞ on a Kaeser Sigma Control 2 myself?
Yes, if you are equipped to safely drain and refill with the approved Kaeser fluid; reset the counter afterward.
When does 0026 W — Oil change h ⇞ on a Kaeser Sigma Control 2 need a technician?
Teams without the equipment or the approved fluid should book service — the wrong oil or a bad refill costs far more than the service call. Have Kaeser service perform the change if you are not equipped to safely drain and refill the unit.
Verified against service documentation: Kaeser Sigma Control 2 documentation for 0026 W — Oil change h ⇞ (airsolcan.com)