What does Kaeser warning 0008 W (airend temperature high) mean?
Short answer: Airend temperature approaching shutdown limit (warning). If your Kaeser Sigma Control 2 is showing 0008 W — Airend discharge temperature ADT ↑, 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 maximum airend discharge temperature is almost reached. The machine keeps running, but it is warning you a thermal shutdown is coming.
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?
- Cooler getting dirty and losing heat rejection
- Cooling oil level dropping
- Oil filter overdue
- Ventilation or installation conditions outside specified limits
Can you fix it yourself?
Usually, yes — this is the warning stage: clean the cooler, check oil, change an overdue filter, and fix ventilation before it becomes the 0015 A shutdown.
Step by step — what to try, in order:
- Clean the cooler.
- Check the cooling oil level.
- Replace the oil filter if it is due.
- Ensure adequate ventilation and keep installation conditions within specified limits.
When do you need a technician — and why?
Persistent warnings after those steps mean something in the oil or cooling circuit is drifting, and that diagnosis needs a service technician's gauges.
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 0008 W — Airend discharge temperature ADT ↑ mean on a Kaeser Sigma Control 2?
Airend temperature approaching shutdown limit (warning). The maximum airend discharge temperature is almost reached. The machine keeps running, but it is warning you a thermal shutdown is coming.
Can I fix 0008 W — Airend discharge temperature ADT ↑ on a Kaeser Sigma Control 2 myself?
Usually, yes — this is the warning stage: clean the cooler, check oil, change an overdue filter, and fix ventilation before it becomes the 0015 A shutdown.
When does 0008 W — Airend discharge temperature ADT ↑ on a Kaeser Sigma Control 2 need a technician?
Persistent warnings after those steps mean something in the oil or cooling circuit is drifting, and that diagnosis needs a service technician's gauges. Call service if the warning persists after cleaning the cooler and correcting oil level and ventilation.
Verified against service documentation: Kaeser Sigma Control 2 documentation for 0008 W — Airend discharge temperature ADT ↑ (airsolcan.com)