How do I reset an emergency stop on a Quincy QGD Airlogic2 controller?
Short answer: Emergency stop activated. If your Quincy QGD 40-60 / QGS 40-100 (Airlogic2 controller) is showing Emergency stop, 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 was pressed and the compressor stopped immediately. The event is recorded in the Event History menu, and the controller's Reset action clears it once the button is released.
Which machines show this?
Quincy QGD 40-60 hp and QGS 40-100 hp rotary screw compressors with the Airlogic2 display controller, including Full Feature packages with the integrated refrigerated dryer. Like Quincy's smaller INFOLOGIC machines, these display icons and text messages, not numbered fault codes — a lit alarm LED means a warning, a flashing one a shutdown, and the specific condition is spelled out on the controller's screens and logged in the Event History menu. Warning and shutdown levels for temperatures are programmed values with factory settings, so your machine's exact trip points can differ. Two habits the manual insists on: the emergency stop does not make the machine voltage-free, and service timer changes go through the authorized distributor.
What causes it?
- The emergency stop button was pressed — the event is logged in the Event History menu
- The button is still latched, blocking the Reset action
Can you fix it yourself?
Yes — resolve the cause, unlock the button, clear the condition with the Reset action button, and restart. Repeated mystery e-stops deserve investigation, not shrugs.
Step by step — what to try, in order:
- Resolve the reason the e-stop was pressed
- Unlock the emergency stop button
- Use the controller's Reset action button to clear the condition
- Restart with the start button
When do you need a technician — and why?
The manual is blunt that emergency stop does not remove voltage from the machine — any inspection beyond the button itself needs the unit switched off and locked out, and safety-circuit faults are technician work.
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 Emergency stop mean on a Quincy QGD 40-60 / QGS 40-100 (Airlogic2 controller)?
Emergency stop activated. The emergency stop button was pressed and the compressor stopped immediately. The event is recorded in the Event History menu, and the controller's Reset action clears it once the button is released.
Can I fix Emergency stop on a Quincy QGD 40-60 / QGS 40-100 (Airlogic2 controller) myself?
Yes — resolve the cause, unlock the button, clear the condition with the Reset action button, and restart. Repeated mystery e-stops deserve investigation, not shrugs.
When does Emergency stop on a Quincy QGD 40-60 / QGS 40-100 (Airlogic2 controller) need a technician?
The manual is blunt that emergency stop does not remove voltage from the machine — any inspection beyond the button itself needs the unit switched off and locked out, and safety-circuit faults are technician work. Call for service if the machine will not reset or repeatedly ends up e-stopped for unclear reasons.
Verified against service documentation: Quincy QGD 40-60 / QGS 40-100 (Airlogic2 controller) documentation for Emergency stop (compressorworld.com)