WANDERS Domus Mode D'emploi Et Instructions D'installation page 23

Step 
Do not place a log in front of the pilot flame as this will
prevent the main burner from igniting and may result in
the accumulation of unburned gases in the hearth. If this
happens you must extinguish the pilot flame and contact
you certified dealer
It is prohibited to add extra (ceramic) logs or other
materials to the lumber set. It will prevent the hearth
from working properly and can damage your unit
beyond repair. The ceramic logs can be replaced only by
the same logs produced by WANDERS.
Placing the batteries
Technical data
The remote handset of this gas hearth is powered by a
9 V block battery. The receiver in the hearth has four
.5V batteries (type LR6 or AA). The batteries will last for
about one year.
placing the battery in the back of the remote control
placing the batteries in the receiver of the hearth.