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HERZ ETKF
Setting the heating break
If the heating is being switched off for the summer, you can save battery power. This involves opening the valve up fully.
Limescale protection measures remain in place. Wireless commands from the window contact or remote control will no
longer be executed.
• To activate the heating break, turn the setting wheel clockwise during manual operation (Manu) until “On” appears on
the display.
• To terminate the heating break, quit manual operation (Manu) or turn the setting wheel anticlockwise.
Setting frost protection mode
If you do not want the room to be heated, the valve can be closed. It will only be opened again if there is a risk of freezing
due to frost. Limescale protection measures remain in place. Wireless commands from the window contact or remote control
will no longer be executed.
• To activate frost protection mode, turn the setting wheel anticlockwise during manual operation (Manu) until “OFF”
appears on the display.
• To terminate frost protection mode, quit manual operation (Manu) or turn the setting wheel clockwise.
“Window open” function
If the room is being ventilated, the actuator controls the temperature to save on heating costs. While this function is active,
the “window open” symbol ( ) appears on the display.
Without window contact: The actuator will automatically detect a significant drop in temperature due to ventilation. You
can set your own “window open” temperature and time.
With taught-in window contact: The temperature will only be reduced during the time that the window is left open. You
can set your own “window open” temperature.
• Press and hold down the menu button for more than 3 seconds.
• Use the setting wheel to select the “AEr” menu item.
• Confirm with OK.
• Use the setting wheel to set the temperature/time. Then press OK to confirm.
• Without a taught-in window contact, this function can be deactivated by selecting a time of “0”.
Setting the offset temperature
The temperature is measured at the heating appliance itself, with the result that other parts of the room may be warmer or
colder than this. To allow for this, you can set a temperature offset of ±3.5°C. If, for example, a temperature of 18°C is measu-
red somewhere within the room instead of the 20°C set, it means that an offset of -2.0°C needs to be configured.
• Press and hold down the menu button for more than 3 seconds.
• Use the setting wheel to select the “tOF” menu item.
• Confirm with OK.
• Use the setting wheel to modify the temperature.
• Press the OK button to confirm.
Restoring the factory settings
You can reset the actuator to its initial state manually. This will clear all the settings that have been made manually.
• Press and hold down the menu button for more than 3 seconds.
• Use the setting wheel to select the “rES” menu item.
• Confirm with OK.
• “ACC” will appear on the display; press OK to confirm.
Intended use
The energy-saving controller has been designed for the purpose of controlling a standard heating appliance valve. The de-
vice may only be operated indoors and must be protected from the effects of damp and dust, as well as solar radiation and
sources of radiant heat. Using the device for a purpose or in a manner other than that described in this operating manual
constitutes a breach of the “intended use” and shall invalidate the warranty and any liability claims. The same shall apply in
the event of any conversion or modification work. The devices are intended exclusively for domestic use.
Troubleshooting and maintenance
Error code on display
Problem
Remedy
Battery symbol (
)
Battery power too low
Replace batteries
F1
Valve actuator sluggish
Check installation, inspect
heating valve
F2
Adjusting range too large
Check actuator fastening
F3
Adjusting range too small
Check heating valve
F4
1 wall thermostat already
taught in
Teach out devices
F5
4 wireless components
already taught in
At 12:00 every Saturday, the actuator performs a weekly descaling function to prevent valve calcification. “CAL” will appear
on the display.
