What does Change Separator mean on a Gardner Denver AirSmart G2?
Short answer: Separator element plugged (G2 shutdown). If your Gardner Denver AirSmart G2 controller is showing Change Separator, 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?
Differential pressure across the separator element exceeded 15 PSIG (1 bar), forcing a shutdown until the element is changed.
Which machines show this?
Gardner Denver rotary screw compressors with the second-generation AirSmart G2 controller, the color-display successor to the original AirSmart. The key difference for anyone searching a fault: the G2 displays fault names as plain text — "High Discharge Temp", "Drive 1 Fault", "Change Separator" — while the first-generation AirSmart showed numbered codes like SHUTDOWN #128. If your display shows words with no number, you are on a G2. Shutdowns stop the machine and reset with the STOP button once it has come to rest; advisories keep the machine running and clear from the home screen's upper-right (Gardner Denver logo) button. Many G2 packages pair the controller with a variable frequency drive it supervises.
What causes it?
- Separator element differential pressure exceeded 15 PSIG — the element is plugged
- Element overdue per the Separator Change Timer advisory history
Can you fix it yourself?
No — resetting only permits short-term operation. Order the correct element and get it changed; a plugged separator costs energy and carries oil downstream until it's replaced.
Step by step — what to try, in order:
- Order the correct separator element for your model
- Press STOP to reset only for short-term operation until replacement
- Check the Separator Change Timer advisory history to confirm the element was overdue
When do you need a technician — and why?
The element sits inside the pressurized air/oil tank, which must be depressurized before opening — the manual explicitly marks this as not a DIY job.
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 Change Separator mean on a Gardner Denver AirSmart G2 controller?
Separator element plugged (G2 shutdown). Differential pressure across the separator element exceeded 15 PSIG (1 bar), forcing a shutdown until the element is changed.
Can I fix Change Separator on a Gardner Denver AirSmart G2 controller myself?
No — resetting only permits short-term operation. Order the correct element and get it changed; a plugged separator costs energy and carries oil downstream until it's replaced.
When does Change Separator on a Gardner Denver AirSmart G2 controller need a technician?
The element sits inside the pressurized air/oil tank, which must be depressurized before opening — the manual explicitly marks this as not a DIY job. Call a technician to change the element — the air/oil tank must be depressurized before opening.
Verified against service documentation: Gardner Denver AirSmart G2 controller documentation for Change Separator (best-aire.com)