---
title: Operating lock
description: "![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_1-1-0-1024x1024.jpg) Usecase: Publicly accessible government offices or hotel rooms. **Switching on** Press and hold simultaneously the following keys for 10 sec.: ![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_down.png) ![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_open.png) → The **LOC** display then appears and confirms the setting made. --- **Switching off** Press and hold…"
url: "https://faqdoc.info/en/systemauswahl/alpha-direct-en/alpha-direct-thermostat-55-matrix/operating-lock/"
updated: "2026-09-30"
category: Alpha direct thermostat 55 Matrix
---

# Operating lock

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_1-1-0-1024x1024.jpg)

Usecase: Publicly accessible government offices or hotel rooms.

**Switching on**
Press and hold simultaneously the following keys for 10 sec.:

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_down.png)

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_open.png)

→ The **LOC** display then appears and confirms the setting made.

---

**Switching off**
Press and hold simultaneously the following keys for 10 sec.:

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_down.png)

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_open.png)

→ The **OPE** display then appears and confirms the setting made.