What does the TS1 temperature sensor error mean on a Quincy QGS?
Short answer: Element outlet temperature sensor disconnected. If your Quincy QGS 20-30 (INFOLOGIC controller) is showing Temperature sensor error (TS1), 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 general alarm LED flashes when the element outlet temperature sensor (TS1) is disconnected — the controller has lost its temperature protection signal. The manual says to first check connections and cables before condemning the sensor.
Which machines show this?
Quincy QGS 20-30 hp rotary screw compressors with the compact INFOLOGIC controller, including tank-mounted and integrated-dryer variants. There are no numbered fault codes on this controller: it communicates with LEDs and pictographs — a flashing temperature symbol, a motor symbol, an e-stop symbol, a service wrench — plus small scrollable screens (like d.06 for service-timer hours). Identifying a fault means reading which pictograph is lit or flashing and whether the alarm LED is steady (warning) or flashing (shutdown). Warnings clear themselves when the condition passes; shutdowns need the cause corrected and the unit reset. Larger QGS machines from 40 hp up use the different Airlogic2 controller instead.
What causes it?
- Element outlet temperature sensor TS1 disconnected
- Cable or connection fault — the manual says check connections and cables before condemning the sensor
- An actual failed sensor, proven only after the wiring checks out
Can you fix it yourself?
Power-cycle once and stop there. Do not run the compressor without a working temperature reading — TS1 is its only protection against a high-temperature failure.
Step by step — what to try, in order:
- Note the alarm and any error message on the display
- Power-cycle the unit once
- Do not run the compressor without a working temperature reading
When do you need a technician — and why?
The manual requires the sensor be replaced only after being proven faulty, and proving it means electrical diagnostic work on the control wiring by qualified personnel.
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 Temperature sensor error (TS1) mean on a Quincy QGS 20-30 (INFOLOGIC controller)?
Element outlet temperature sensor disconnected. The general alarm LED flashes when the element outlet temperature sensor (TS1) is disconnected — the controller has lost its temperature protection signal. The manual says to first check connections and cables before condemning the sensor.
Can I fix Temperature sensor error (TS1) on a Quincy QGS 20-30 (INFOLOGIC controller) myself?
Power-cycle once and stop there. Do not run the compressor without a working temperature reading — TS1 is its only protection against a high-temperature failure.
When does Temperature sensor error (TS1) on a Quincy QGS 20-30 (INFOLOGIC controller) need a technician?
The manual requires the sensor be replaced only after being proven faulty, and proving it means electrical diagnostic work on the control wiring by qualified personnel. Call a technician if the alarm persists — the manual requires the sensor be replaced only after being proven faulty, which is electrical diagnostic work.
Verified against service documentation: Quincy QGS 20-30 (INFOLOGIC controller) documentation for Temperature sensor error (TS1) (airenergy.com)