DE DIETRICH Thermostat modulant d’ambiance - Manual (Page 78)

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Problem The display does not function.
Solution Thermostat OpenTherm: your boiler may not support OpenTherm Smart
Power. Thermostat RF: insert (full) batteries.
Problem The backlight for the display does not work.
Solution Thermostat OpenTherm: your boiler may not support OpenTherm Smart
Power. In that case fit batteries in the thermostat (see paragraph 3.2).
Thermostat RF: insert (full) batteries.