What does Gardner Denver shutdown 201 low sump pressure mean?
Short answer: Low sump/reservoir pressure. If your Gardner Denver AirSmart controller is showing SHUTDOWN #201 LOW SUMP PRES, 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?
Reservoir pressure stayed below 15 PSIG (1 bar) after one minute of operation, pointing to an inlet valve or minimum pressure valve problem.
Which machines show this?
Gardner Denver rotary screw compressors fitted with the first-generation AirSmart microprocessor controller — a wide range of oil-injected packages, including VFD-equipped variable-speed units where the controller supervises the drive. The first-generation AirSmart reports problems as numbered codes: SHUTDOWN #1xx and #2xx faults that stop the machine, and ADVISORY #3xx warnings that let it keep running while flagging maintenance. That numbering matters when you search — the later AirSmart G2 dropped the numbers and displays plain-text fault names instead, so a numbered code on the screen tells you that you are on the earlier controller. Shutdowns clear with Stop/Reset once the machine has stopped; advisories acknowledge with the Enter key.
What causes it?
- A large open demand or major leak downstream pulling pressure away faster than the machine builds it
- Service valves positioned wrong after maintenance
- Inlet valve or minimum pressure valve not doing its job — the manual's stated cause when pressure stays under 15 PSIG
Can you fix it yourself?
Check the easy stuff first: close the big open demand, set the valves right, and watch sump pressure build on one restart. If it still won't hold 15 PSIG, the valves themselves are the problem.
Step by step — what to try, in order:
- Check for a large open demand or major leak downstream drawing pressure away
- Confirm service valves are positioned correctly
- Press Stop/Reset and try one restart while watching sump pressure build
When do you need a technician — and why?
Inlet valve and minimum pressure valve repairs mean opening the pressurized air circuit at the sump — pressurized-system work the manual assigns to 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 SHUTDOWN #201 LOW SUMP PRES mean on a Gardner Denver AirSmart controller?
Low sump/reservoir pressure. Reservoir pressure stayed below 15 PSIG (1 bar) after one minute of operation, pointing to an inlet valve or minimum pressure valve problem.
Can I fix SHUTDOWN #201 LOW SUMP PRES on a Gardner Denver AirSmart controller myself?
Check the easy stuff first: close the big open demand, set the valves right, and watch sump pressure build on one restart. If it still won't hold 15 PSIG, the valves themselves are the problem.
When does SHUTDOWN #201 LOW SUMP PRES on a Gardner Denver AirSmart controller need a technician?
Inlet valve and minimum pressure valve repairs mean opening the pressurized air circuit at the sump — pressurized-system work the manual assigns to a technician. Call for service if pressure will not build — inlet valve and minimum pressure valve repairs are pressurized-system work.
Verified against service documentation: Gardner Denver AirSmart controller documentation for SHUTDOWN #201 LOW SUMP PRES (best-aire.com)