What does Kaeser alarm 0039 A (package discharge temp too high) mean?
Short answer: Package discharge temperature too high. If your Kaeser Sigma Control 2 is showing 0039 A — PD 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 compressed air discharge temperature leaving the package is too high, usually a cooling problem.
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 dirty, cutting heat rejection from the package
- Cooling oil level low
- Cooling fan stopped or its airflow obstructed
Can you fix it yourself?
Often, yes — oil level, cooler cleaning, and confirming the fan runs cover the documented causes an operator can touch.
Step by step — what to try, in order:
- Check the cooling oil level.
- Clean the cooler.
- Verify the cooling fan is running and airflow is unobstructed.
When do you need a technician — and why?
A fan motor that won't run or an alarm that returns after cleaning is fan-motor or sensor work — electrical items for a technician.
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 0039 A — PD temperature ⇞ mean on a Kaeser Sigma Control 2?
Package discharge temperature too high. The compressed air discharge temperature leaving the package is too high, usually a cooling problem.
Can I fix 0039 A — PD temperature ⇞ on a Kaeser Sigma Control 2 myself?
Often, yes — oil level, cooler cleaning, and confirming the fan runs cover the documented causes an operator can touch.
When does 0039 A — PD temperature ⇞ on a Kaeser Sigma Control 2 need a technician?
A fan motor that won't run or an alarm that returns after cleaning is fan-motor or sensor work — electrical items for a technician. Call service if the fan is not running or the alarm returns after cleaning — fan motor or sensor work is a technician job.
Verified against service documentation: Kaeser Sigma Control 2 documentation for 0039 A — PD temperature ⇞ (airsolcan.com)