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to the correct polarity. If possible use alkaline batteries.
• Close the battery compartment.
• Like during first commissioning the heating control asks
you to enter date and time.
• However, the settings of the time program, the comfort/
lowering temperature, etc., have been maintained.
• Since the heating control and the valve operating mecha
nisms are no longer synchonised after a battery replace
ment the heating control performs an automatic synchro
nisation that takes about 2 minutes (“SYnc Auto”).
After the synchronisation the heating control returns to
the normal operating mode.
b) “FHT8V” valve operating mechanism
If the batteries of the valve operating mechanism are emp
ty, the battery symbol is displayed. In addition, an acoustic
signal in generated in intervals of 2 minutes for three hours
every day.
Proceed as follows to replace the batteries:
• Remove the cover of the valve operating mechanism’s
battery compartment (slide down).
• Remove the empty batteries and dispose of them ac
cording to applicable environmental regulations
• Wait until all segments of the valve operating mecha
nism’s LC display are off. You may speed up this process
by pressing the key on the valve operating mechanism.
• Insert two new LR6 (Mignon/AA) batteries into the bat
tery compartment. Pay attention to the correct polarity. If
possible use alkaline batteries.
• The display shows “C1” followed by a 2-digit number,
followed by “C2” and another 2-digit number (both num
bers together are the currently stored safety code of the
