OJ Microline Thermostat for Home Assistant (Marketplace integration)

Installs: 169 sharing analytics
GitHub stars: 19
Connection: Uses the vendor's cloud
Upkeep: Updated in the last 6 months
Version: 2.1.2, October 17, 2026
Category: Climate, Thermostats and heating
Kind: Marketplace integration
Needs: Needs the Marketplace (HACS on 2026.10 and older)
Domain: ojmicroline_thermostat
Source: github.com/robbinjanssen/home-assistant-ojmicroline-thermostat
Issues: Report an issue

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation.

About

OJ Microline Thermostat connects an OJ Microline Wifi thermostat to Home Assistant through the vendor's cloud. It provides a climate entity plus binary sensors, sensors, switches and date entities for vacation, temperatures, power and energy usage. Presets and target temperature can be changed, and an option sets the comfort mode duration and comfort temperature. WD5 and WG4 series thermostats receive live updates, and energy usage history is imported as a long-term statistic for the energy dashboard. For the WD5 series, actions set or cancel a vacation and edit the weekly schedule. Setup is done in the UI, where the thermostat series is chosen and account details are entered.

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Supports

Uses the vendor's cloud Needs an internet connection and an account with the vendor.
From the Marketplace Installed through the Marketplace, formerly HACS.
Actively maintained Its author released or pushed a change in the last six months.

Provides

Climate
Switches
Sensors

Setting it up

Install it from the Marketplace and restart Home Assistant, then add it under Settings, Devices and services.

Connect

ModelThe WD5 series includes OWD5 and MWD5; the WG4 series includes UWG4 and AWG4; the WG5 series includes UWG5.

Wd5

Username
Password
API KeyThe API key used by the app.
HostLeave blank to use the default. If specified, omit the https://.
Customer IDLeave blank to use the default.

Wg4

Username
Password
HostLeave blank to use the default. If specified, omit the https://.
Application codeThe application code sent on login. Standard WG4 thermostats use 2 (the default); Danfoss LX (lxwifi.danfoss.us) requires 4.

Wg5

UsernameThe account you use in the OJ Microline app.
Password
Identity hostOAuth2 login server. Leave blank for standard OJ Microline. For nJoy / WarmlyYours (UWG5) enter: identity.njoy.warmlyyours.com (omit the https://).

Re-enter the password

Password

Reconfigure

Username
Password
API Key
HostLeave blank to use the default. If specified, omit the https://.
Customer IDLeave blank to use the default.
Application code
Identity hostOAuth2 login server. Leave blank for standard OJ Microline. For nJoy / WarmlyYours (UWG5) enter: identity.njoy.warmlyyours.com (omit the https://).

After setup

Set the regulation to comfort mode when changing the temperature.
The duration in minutes the comfort mode should be enabled.
Comfort temperatureThe temperature used when switching to the comfort preset. Leave empty to use the comfort temperature stored in the thermostat.

Texts from the code of robbinjanssen/home-assistant-ojmicroline-thermostat.

Entities

Binary sensorsOnline, Heating, Adaptive mode, Open window detection
DatesVacation begin, Vacation end
SensorsSchedule, Temperature room, Temperature floor, Temperature range min, Temperature range max, Temperature set point, Energy usage, Power, Sensor mode, Boost end time, Comfort end time, Vacation begin time, and 1 more
SwitchesVacation

Actions

Set vacationSchedule a vacation for the thermostat's group (WD5 series). The vacation runs from 00:00 on the start date until 00:00 on the end date; if it has already started, vacation mode is activated immediately.Fields: Start date, End date
Cancel vacationCancel the scheduled or active vacation for the thermostat's group (WD5 series). An active vacation returns to schedule or manual mode, whichever was used last.
Set scheduleSet the events of one or more weekdays in the thermostat group's weekly schedule (WD5 series). Up to 6 events per day, on the quarter hour, at least 15 minutes apart; a time earlier than the previous one is after midnight (03:00 at the latest).Fields: Days, Events