What does Kaeser alarm 0002 A (motor temperature too high) mean?
Short answer: Compressor motor too hot (shutdown). If your Kaeser Sigma Control 2 is showing 0002 A — Motor temperature ⇞, 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 drive motor overheated and the controller shut the machine down.
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?
- Motor cooling air blocked or the motor exterior caked in dust
- Ambient conditions outside the machine's limits
- Motor or its temperature sensor failing when trips continue after cleanup
Can you fix it yourself?
Often, yes — let it cool, clean the motor exterior, clear the cooling air supply, and keep the room within limits.
Step by step — what to try, in order:
- Let the motor cool before restarting.
- Keep ambient conditions within the machine's specified limits.
- Check the cooling air supply for blockages.
- Clean dust and dirt off the motor exterior.
When do you need a technician — and why?
If the motor still trips hot, the motor itself or its sensor needs professional attention — winding and sensor checks are meter work, not visual checks.
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 0002 A — Motor temperature ⇞ mean on a Kaeser Sigma Control 2?
Compressor motor too hot (shutdown). The drive motor overheated and the controller shut the machine down.
Can I fix 0002 A — Motor temperature ⇞ on a Kaeser Sigma Control 2 myself?
Often, yes — let it cool, clean the motor exterior, clear the cooling air supply, and keep the room within limits.
When does 0002 A — Motor temperature ⇞ on a Kaeser Sigma Control 2 need a technician?
If the motor still trips hot, the motor itself or its sensor needs professional attention — winding and sensor checks are meter work, not visual checks. Call service if the motor trips hot again after cleaning and correcting ventilation — the motor or its sensor needs professional attention.
Verified against service documentation: Kaeser Sigma Control 2 documentation for 0002 A — Motor temperature ⇞ (airsolcan.com)