Why is the dew point pictograph flashing on my Quincy QGS compressor?
Short answer: High dew point warning (integrated dryer). If your Quincy QGS 20-30 (INFOLOGIC controller) is showing Dew-point temperature warning (pictograph flashing), 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?
On units with the integrated dryer, the dew-point temperature exceeded the (non-programmable) warning level. The alarm LED lights and the dew-point pictograph flashes; the warning clears when the condition does.
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?
- Hot compressor room driving the integrated dryer's dew point over the warning level
- Dirty dryer condenser
- Condensate drain not discharging
- Refrigerant charge or circuit problems if cleaning doesn't fix it
Can you fix it yourself?
Often — cool the room, clean the condenser with power off, and check the drain; the warning clears itself when the dew point recovers. Persistent high dew point points at the refrigeration circuit.
Step by step — what to try, in order:
- Scroll to display the actual dew-point temperature
- Check the room temperature and improve ventilation if hot
- Press the stop button, wait for the unit to stop, then switch off the voltage
- With power off, clean the dryer condenser and check the condensate drain
- Restart and confirm the dew point recovers
When do you need a technician — and why?
Refrigerant charge and circuit repairs on the integrated dryer are refrigeration work requiring a qualified refrigeration technician, both legally and practically.
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 Dew-point temperature warning (pictograph flashing) mean on a Quincy QGS 20-30 (INFOLOGIC controller)?
High dew point warning (integrated dryer). On units with the integrated dryer, the dew-point temperature exceeded the (non-programmable) warning level. The alarm LED lights and the dew-point pictograph flashes; the warning clears when the condition does.
Can I fix Dew-point temperature warning (pictograph flashing) on a Quincy QGS 20-30 (INFOLOGIC controller) myself?
Often — cool the room, clean the condenser with power off, and check the drain; the warning clears itself when the dew point recovers. Persistent high dew point points at the refrigeration circuit.
When does Dew-point temperature warning (pictograph flashing) on a Quincy QGS 20-30 (INFOLOGIC controller) need a technician?
Refrigerant charge and circuit repairs on the integrated dryer are refrigeration work requiring a qualified refrigeration technician, both legally and practically. Call a refrigeration-qualified technician if the dew point stays high — refrigerant charge and circuit repairs are not DIY.
Verified against service documentation: Quincy QGS 20-30 (INFOLOGIC controller) documentation for Dew-point temperature warning (pictograph flashing) (airenergy.com)