How do I reset an ESTOP fault on a Quincy QSI compressor?
Short answer: Emergency stop button pressed. If your Quincy QSI series (QSI standard controls) is showing ESTOP, 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 Emergency Stop button on the control panel has been pushed, shutting the compressor down immediately. The unit will not restart until the button is released and the fault is cleared.
Which machines show this?
Quincy QSI industrial rotary screw compressors with the standard QSI control panel — larger plant-air packages, some fitted with Quincy's integrated refrigerated dryer, whose faults (DRYER CONT., DRYER D.P.) appear on the same display without stopping the compressor. The QSI panel reports faults as short text messages — OVERLOAD, HIGH TEMP, SUMP HAT, TEMP FAULT — rather than numeric codes, so search the exact wording on your display. "Sump" in these messages means the fluid separator vessel, and "fluid" is Quincy's term for the compressor lubricant. Faults clear from the panel after the cause is corrected; the manual keeps the electrical enclosure strictly off-limits to unqualified hands.
What causes it?
- The Emergency Stop button on the panel was pushed and is still latched
- The underlying reason someone hit the E-stop hasn't been resolved
Can you fix it yourself?
Yes — find out why it was pressed, fix that first, release the button, clear the fault, and restart. If it won't reset, leave the unit off.
Step by step — what to try, in order:
- Find out why the e-stop was pressed and make sure that problem is resolved first
- Twist or pull the emergency stop button to release it
- Clear the fault on the controller and restart the compressor
- If it will not reset, leave the unit off and get help
When do you need a technician — and why?
A fault that won't clear with the button released means a safety-circuit problem in the control wiring, and if nobody knows why the E-stop was hit, restarting blind risks running a damaged machine.
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 ESTOP mean on a Quincy QSI series (QSI standard controls)?
Emergency stop button pressed. The Emergency Stop button on the control panel has been pushed, shutting the compressor down immediately. The unit will not restart until the button is released and the fault is cleared.
Can I fix ESTOP on a Quincy QSI series (QSI standard controls) myself?
Yes — find out why it was pressed, fix that first, release the button, clear the fault, and restart. If it won't reset, leave the unit off.
When does ESTOP on a Quincy QSI series (QSI standard controls) need a technician?
A fault that won't clear with the button released means a safety-circuit problem in the control wiring, and if nobody knows why the E-stop was hit, restarting blind risks running a damaged machine. Call a service technician if the fault will not clear after the button is released or if you cannot identify why it was pressed.
Verified against service documentation: Quincy QSI series (QSI standard controls) documentation for ESTOP (manualslib.com)