OJ Electronics specializes in designing and manufacturing intelligent electronic controls for electric underfloor heating and HVAC systems, ensuring energy efficiency and comfort.
OJ Electronics is a global leader in the design and development of electronic controls for underfloor heating and ventilation systems. Headquartered in Sønderborg, Denmark, the company has over five decades of experience in creating intelligent solutions that improve indoor climate comfort and energy efficiency for residential, commercial, and industrial applications.
The brand is widely recognized for its OJ Microline® series of thermostats, which feature intuitive touchscreens, WiFi connectivity, and precise temperature regulation for electric floor heating. Beyond heating, OJ Electronics produces advanced drives and control systems for air handling units (AHUs) and ventilation applications. Their products are designed with a focus on reliability, ease of installation, and compliance with strict international safety standards.
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Press the test button on the unit (often the top button). The red light should flash, indicating the ground fault circuit interrupter is working. Press the reset button (often on the side) to return to normal operation. This should be done monthly.
Sensorless mode allows the thermostat to operate based on a fixed heating percentage (duty cycle) rather than temperature readings. This is useful if the floor sensor is damaged or not installed.
OJ thermostats are generally suitable for tile, stone, laminate, concrete, and wooden floors, provided the correct floor protection settings are selected during setup.
Typically, a white LED indicates power is on with no heat demand. An amber LED indicates the heat relay is active. A flashing red LED usually signals a GFCI error or trip.
The serial number and software version can often be found in the 'User Settings' or 'Thermostat Readouts' menu under the 'Support' or 'About' section of the interface.