Kolpak Walk-In Cooler Error Code DOOR TEMP SENSOR: Display AUX1 Shorted or Open
DOOR TEMP SENSOR means Display AUX1 Function is set to DOOR TEMP and the input is shorted or open. The controller cannot read the door temperature sensor. Press ENTER to silence the alarm for one hour and have the sensor and cable checked.
Low: the door temperature reading is lost, and the main room controls keep working.
- Code
- DOOR TEMP SENSOR
- Maker
- Kolpak
- Equipment
- Walk-in coolers & freezers
- Applies to
- ArcticFox OEM Controller with Deluxe Display (Kolpak walk-ins)
What does Kolpak DOOR TEMP SENSOR mean?
On the Deluxe Display, AUX1 can be set to read a door temperature sensor, which watches the temperature at the walk-in door. In that setting the controller expects a normal sensor reading. A shorted input has no resistance and an open input has none connected, and neither can come from a healthy sensor. When the controller sees one of those states on Display AUX1 with the function set to DOOR TEMP, it posts the text alarm DOOR TEMP SENSOR in the Alarms menu. The alarm reports on the sensor circuit only. Door temperature alarms such as DOOR TEMP HIGH and DOOR TEMP LOW depend on this reading, so they cannot work properly while the sensor is bad. The sound returns after the one-hour silence if the circuit is not repaired.
Affected models and control systems
ArcticFox OEM Controller with Deluxe Display on Kolpak walk-ins. This alarm applies when Display AUX1 Function is DOOR TEMP and is listed in the Alarms menu on page 16.
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
- DOOR TEMP SENSOR text in the Alarms menu
- Audible alarm from the display
- No door temperature reading shown
- Door temperature alarms not triggering
Possible causes
Likely causes — what usually sits behind DOOR TEMP SENSOR on this control. A technician confirms which one it is before any part is replaced.
- Door temperature sensor cable pinched at the door frame by repeated opening
- Sensor connector disconnected during cleaning or door service
- Moisture at the door entry corroding the sensor or its terminal
- Display AUX1 set to DOOR TEMP although no sensor is fitted
Safe checks before calling for service
- Press ENTER to silence the alarm. It stays quiet for 1 hour and returns if the sensor circuit is not repaired.
- Look at the area around the door frame for a loose or hanging sensor wire. Do not pull or cut it.
- Ask whether the door or frame was serviced recently.
- Give the technician the alarm text DOOR TEMP SENSOR and the time it started.
How a technician diagnoses DOOR TEMP SENSOR
- Verify Display AUX1 Function is DOOR TEMP.
- Inspect the sensor and the cable where it crosses the door frame.
- Disconnect and meter the sensor resistance against its chart, then test the cable for continuity.
- Replace the sensor or repair the cable, then confirm a sensible reading on the Display.
- The sensor connection is inside the Display, which should not be opened by an operator.
- A meter and a resistance chart are needed to separate a bad sensor from a bad wire.
- A damaged door-frame cable may need routing that protects it from repeated door movement.
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
Does DOOR TEMP SENSOR mean the door is warm?
No. It means the door temperature sensor circuit is shorted or open.
Is this the same as DOOR TEMP SENSOR ALARM?
They name the same idea on different controller setups. This one is for the OEM controller with Display AUX1. The other is for the stand-alone Display.
Will the door alarms still work?
The door temperature alarms rely on this reading, so they cannot work properly until the sensor reads again.
Need help with Kolpak DOOR TEMP SENSOR?
A technician confirms the cause on site and gives you the price in writing before any work starts.