What does Kaeser alarm 0015 A (airend temperature too high) mean?
Short answer: Airend discharge temperature too high (shutdown). If your Kaeser Sigma Control 2 is showing 0015 A — 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 permissible airend discharge temperature (ADT) was exceeded and the controller shut the machine down. This is the classic overheat trip on Kaeser rotary screw compressors, typically caused by poor cooling or low oil.
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 surfaces blocked with dust — a dirty cooler cannot shed heat
- Ambient temperature or ventilation outside the machine's limits, or cooling air openings blocked
- Cooling oil level low
- Temperature monitoring or cooling-system fault if the trip repeats after cleanup
Can you fix it yourself?
Often, yes — cooldown, cooler cleaning, oil top-up (machine off and depressurized), and ventilation fixes clear most ADT shutdowns.
Step by step — what to try, in order:
- Let the machine cool down before doing anything else.
- Check that ambient temperature and ventilation are within the machine's specified limits (cooling air inlet and outlet not blocked or too close to a wall).
- Clean the cooler surfaces of dust and debris.
- Check the cooling oil level with the machine off and depressurized per the operator manual sight glass procedure.
- Acknowledge the alarm with the reset key after cooldown and monitor the next run.
When do you need a technician — and why?
A repeat trip after those basics needs Kaeser service to check the thermostatic control and cooling system with instruments rather than another reset.
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 0015 A — Airend discharge temperature ADT ⇞ mean on a Kaeser Sigma Control 2?
Airend discharge temperature too high (shutdown). The maximum permissible airend discharge temperature (ADT) was exceeded and the controller shut the machine down. This is the classic overheat trip on Kaeser rotary screw compressors, typically caused by poor cooling or low oil.
Can I fix 0015 A — Airend discharge temperature ADT ⇞ on a Kaeser Sigma Control 2 myself?
Often, yes — cooldown, cooler cleaning, oil top-up (machine off and depressurized), and ventilation fixes clear most ADT shutdowns.
When does 0015 A — Airend discharge temperature ADT ⇞ on a Kaeser Sigma Control 2 need a technician?
A repeat trip after those basics needs Kaeser service to check the thermostatic control and cooling system with instruments rather than another reset. Call a Kaeser service technician if the trip repeats after cleaning the cooler and correcting oil level and ventilation.
Verified against service documentation: Kaeser Sigma Control 2 documentation for 0015 A — Airend discharge temperature ADT ⇞ (airsolcan.com)