What does Kaeser warning 0002 W (motor temperature high) mean?
Short answer: Compressor motor running hot (warning). If your Kaeser Sigma Control 2 is showing 0002 W — 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 is hot but not yet at the shutdown limit.
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 running hot but below the shutdown limit — restricted cooling air
- Dust and dirt on the motor exterior
- Ambient conditions outside limits
Can you fix it yourself?
Usually, yes — this is the early warning: clean the motor, clear the cooling air supply, and keep the room in spec before it becomes the 0002 A trip.
Step by step — what to try, in order:
- Keep ambient conditions within specified limits.
- Check the cooling air supply for restrictions.
- Clean the motor exterior.
When do you need a technician — and why?
A warning that continues after ventilation and cleaning fixes points at the motor or its sensor — professional checks before it escalates to a shutdown.
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 W — Motor temperature ↑ mean on a Kaeser Sigma Control 2?
Compressor motor running hot (warning). The drive motor is hot but not yet at the shutdown limit.
Can I fix 0002 W — Motor temperature ↑ on a Kaeser Sigma Control 2 myself?
Usually, yes — this is the early warning: clean the motor, clear the cooling air supply, and keep the room in spec before it becomes the 0002 A trip.
When does 0002 W — Motor temperature ↑ on a Kaeser Sigma Control 2 need a technician?
A warning that continues after ventilation and cleaning fixes points at the motor or its sensor — professional checks before it escalates to a shutdown. Call service if the warning continues after improving ventilation and cleaning.
Verified against service documentation: Kaeser Sigma Control 2 documentation for 0002 W — Motor temperature ↑ (airsolcan.com)