Troubleshooting the "Door Open" Error on the UKU Controller – Sauna Mini

Objective

If your UKU Controller displays a "Door Open" error message, this means the sauna believes the door is open, preventing the heater from turning on.

Follow the basic troubleshooting steps below before reaching out to support for more in depth troubleshooting.

Step 1: Inspect the Magnet, Probe, and Harness Connections

📌 The door sensor operates using a magnet and a magnetic probe. When the sauna door is closed, the magnet and probe must create a connection to signal that the door is shut, allowing the heater to turn on.

✅ What to Check:

1. Ensure the magnet and probe are properly aligned.

   • The magnet and probe must be within ½ inch (12mm) of each other when the door is closed.
   • Positioning matters! The edge of the magnet should NOT be directly above the center of the probe.
     • There is a dead spot in the center of the probe where a connection cannot be made.
     • Best practice: Align the edge of the magnet near the edge/side of the probe for proper connection.
   • (Insert image: Correct and incorrect magnet/probe alignment.)

2. Check the harness connections.

   • There are two harness connection points that must be secure for the sensor to communicate properly:
     • One under the bottom door beam.
     • One behind the wooden electrical box in the back right corner of the sauna (when looking in from the outside).
   • Unplug and firmly reconnect both harnesses to ensure a solid connection.
   • Gently wiggle the wires where they enter the harnesses to check for loose connections.
     • If a wire is loose, the sensor may fail to communicate with the UKU Controller.

🚨 If the door sensor components are misaligned, loose, or disconnected, the UKU Controller will continue to display the "Door Open" error.

Step 2: Reset the UKU Controller to Default Settings

📌 Sometimes a communication error occurs between the door sensor and the UKU Controller. Resetting the UKU Controller to factory default settings can often resolve this issue.

✅ How to Reset the UKU Controller:

1. Follow the step-by-step guide here:
   🔗 How to Reset the UKU Controller to Factory Defaults
2. After resetting, you must re-enable and disable a few settings for proper sauna functionality.
   • These settings will be covered in the reset guide linked above.

Next Steps: If You Are Still Experiencing the Error

If you have completed the steps above and the "Door Open" error persists, please reach out to Plunge Customer Support for further troubleshooting.

🔹 If you have already submitted a support ticket:

• You've received an email from Plunge Customer Support with a link letting you know what photos need to be submitted.
• Follow the instructions in the email to upload any required information for our team to review and we'll work on the next steps as soon as possible.

🔹 If you have NOT submitted a support ticket yet:

• Please submit a support request using our Contact Form.
• After submitting your ticket, you will receive an email with a link to upload required details.

📌 There will be additional troubleshooting steps once our team has reviewed the information you submit.

Create a Support Ticket Here