Schlueter Ditra Heat Thermostat

🌍 Overview

This adapter integrates Schlüter / OJ Microline OWD5 thermostats into ioBroker via the official cloud APIs.

It is based on the HA Integration from @robbinjanssen. For more informations see the documentation.

Cloud-only — no local gateway, Modbus, or LAN API required.

🚀 How to Start

Install adapter in ioBroker
Open instance configuration
Enter:

Setting	Description
Username	Your Schlüter/OJ cloud login
Password	Cloud password
API Key	Below works in most cases
Customer ID	Found in thermostat info
Client SW Version	Numeric value from thermostat
Poll Interval	Default: 60 seconds

Save & start adapter

For API-Key you can try with: f219aab4-9ac0-4343-8422-b72203e2fac9. You can find this Key in Forum: https://community.home-assistant.io/t/mwd5-wifi-thermostat-oj-electronics-microtemp/445601, so it looks like a global Key.

Documentation

🇺🇸 Documentation

🇩🇪 Dokumentation

Compact Architecture Overview

Architecture Badges

Compact Program Structure

flowchart LR
  UI[User / UI] --> IO[ioBroker States]
  IO --> ADP[Adapter]

  ADP -->|read| OWD5[OWD5 Cloud]
  ADP -->|write| OCD5[OCD5 Cloud]
  OCD5 --> TH[Thermostat]

  ADP --> OBJ[Object Tree]
  OBJ --> RO[Read States]
  OBJ --> AP[Apply Controls]

Internal Flow (Mini)

flowchart TB
  READY[onReady] --> LOGIN[Cloud Login]
  LOGIN --> POLL[pollOnce]
  POLL --> UPSERT[Update Objects + States]
  UPSERT --> BACKOFF{All offline?}
  BACKOFF -- yes --> INC[Increase interval up to 1h then 12:00/00:00]
  BACKOFF -- no --> RESET[Reset to base interval]
  INC --> POLL
  RESET --> POLL

  APPLYBTN[Apply Button] --> ROUTER[applyRouter]
  ROUTER --> API[updateThermostat]

📌 Notes

Developed and tested with a single thermostat
Multi-device environments supported, but feedback welcome

Changelog

WORK IN PROGRESS

(patricknitsch) Add Node.js 26 in test-and-release.yml

0.7.4 (2026-06-05)

(copilot) Fixes for Repo Checker

0.7.3 (2026-05-25)

(copilot) Fixes for Repo Checker

0.7.2 (2026-05-23)

(copilot) Add Icons for Notifications

0.7.1 (2026-05-21)

(copilot) Modify notification manager to work with instances
(copilot) Update Dependencies

0.7.0 (2026-05-14)

(claude) Add Notification Manager

Older changelog entries can be found in CHANGELOG_OLD.md.

License

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.