Kolpak Walk-In Cooler Alarm LOW AIR TEMP: Room Too Cold
LOW AIR TEMP on a Kolpak walk-in's ArcticFox controller means the room has been colder than its limit for longer than the delay. Press ENTER to silence the alarm for 1 hour. Check for frozen product and call if the room stays too cold.
Medium: the room is colder than intended, which can freeze product, though the equipment is running.
- Code
- LOW AIR TEMP
- Maker
- Kolpak
- Equipment
- Walk-in coolers & freezers
- Applies to
- ArcticFox OEM Controller with Deluxe Display (Kolpak walk-ins)
What does Kolpak LOW AIR TEMP mean?
The low limit is simpler than the high one. The controller takes the ROOM TEMP setting and subtracts LOW TEMP ALARM OFFSET. When the return air temperature stays below that value for longer than LOW TEMP ALARM DELAY, it raises the text alarm LOW AIR TEMP in the Alarms menu. A room that is too cold can freeze produce, dairy and drinks, so the alarm is as much about product as about equipment. The manual's action is to press ENTER to silence the alarm for 1 hour while the condition is addressed, and the alarm sounds again if it is not corrected. It lists no causes. A cold room usually points to the controller not turning cooling off when it should, a setpoint that was changed, or a wrong reading from the return air sensor. The AIR TEMP SENSOR alarm may appear with it if the probe is the problem.
Affected models and control systems
The manual covers the ArcticFox OEM Controller with Deluxe Display used on Kolpak walk-in coolers and freezers.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- LOW AIR TEMP in the Alarms menu
- Produce or drinks freezing
- Ice on shelves, product or evaporator
- Alarm sounding again after an hour
Possible causes
Likely causes — what usually sits behind LOW AIR TEMP on this control. A technician confirms which one it is before any part is replaced.
- Room temperature below ROOM TEMP minus LOW TEMP ALARM OFFSET for longer than LOW TEMP ALARM DELAY
- Room temperature setting changed lower during a cleaning or service visit
- Return air sensor reading warmer than the real room, so cooling does not stop
- Compressor or liquid solenoid not shutting off when the room reaches the setpoint
Safe checks before calling for service
- Press ENTER on the display to silence the alarm for 1 hour.
- Check the product, especially near the evaporator, for freezing.
- Move delicate items such as produce away from the cold air stream.
- Look at the set temperature on the controller and compare it with the usual value.
- If the room stays cold, call for service and note the temperature and set point.
How a technician diagnoses LOW AIR TEMP
- Read the Alarms menu and the controller's air temperature.
- Compare it with a reference thermometer.
- Check the setpoint and alarm offset and delay settings.
- Check that the return air sensor reads correctly.
- Check that the compressor and any liquid line solenoid shut off at the setpoint.
- Confirm the room holds its setting without the alarm returning.
- Setpoint and alarm parameters are service-level settings that change how the room is protected.
- Checking whether the compressor and solenoid shut off needs a meter and gauges.
- A wrong sensor reading has to be proven against a thermometer before parts are changed.
How LOW AIR TEMP differs from similar codes
LOW AIR TEMP is the cold side of the room alarms. HIGH AIR TEMP covers the warm side.
Technical reference
- Document
- ArcticFox Deluxe Display - Original Instructions, Installation, Operation and Maintenance Manual
- Edition
- Part No. 500002385-4, 5/23
- Models / control
- ArcticFox OEM Controller with Deluxe Display (Kolpak walk-ins)
- Section
- ArcticFox OEM Controller - Alarms Menu, p.16
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Kolpak walk-in cooler & freezer error codes
What sets the low limit?
The manual says ROOM TEMP minus LOW TEMP ALARM OFFSET, held for longer than LOW TEMP ALARM DELAY.
Can the alarm cost me product?
Yes. A room that is too cold can freeze produce and drinks.
Could the sensor be the cause?
Yes. A bad return air reading can stop the controller from ending the cooling call.
Need help with Kolpak LOW AIR TEMP?
A technician confirms the cause on site and gives you the price in writing before any work starts.