What does Separator Change Timer mean on a Gardner Denver AirSmart G2?
Short answer: Separator maintenance warning (G2 advisory). If your Gardner Denver AirSmart G2 controller is showing Separator Change Timer, 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?
Either differential pressure across the separator exceeded 8 PSIG or the separator maintenance timer expired — the element should be changed soon.
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 differential pressure passed the 8 PSIG warning level
- The separator maintenance timer expired — the element is due on hours even if pressure drop looks fine
Can you fix it yourself?
The advisory resets from the home screen (upper-right logo button), but the element still needs changing soon — waiting until the 15 PSIG shutdown just turns a scheduled job into downtime.
Step by step — what to try, in order:
- Order the correct separator element
- Schedule replacement before the 15 PSIG shutdown level is reached
- Reset the advisory with the upper-right (Gardner Denver logo) button on the home screen
When do you need a technician — and why?
The element change itself means opening the depressurized air/oil tank — a pressurized-vessel job the manual keeps out of DIY hands.
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 Separator Change Timer mean on a Gardner Denver AirSmart G2 controller?
Separator maintenance warning (G2 advisory). Either differential pressure across the separator exceeded 8 PSIG or the separator maintenance timer expired — the element should be changed soon.
Can I fix Separator Change Timer on a Gardner Denver AirSmart G2 controller myself?
The advisory resets from the home screen (upper-right logo button), but the element still needs changing soon — waiting until the 15 PSIG shutdown just turns a scheduled job into downtime.
When does Separator Change Timer on a Gardner Denver AirSmart G2 controller need a technician?
The element change itself means opening the depressurized air/oil tank — a pressurized-vessel job the manual keeps out of DIY hands. Have a technician perform the element change on a depressurized machine.
Verified against service documentation: Gardner Denver AirSmart G2 controller documentation for Separator Change Timer (best-aire.com)