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Check the alarm indicator regularly to make sure that the heat pump works properly. You would not always notice if
there is something wrong, as the auxiliary heater would start automatically (provided, of course, operating mode
AUTO was selected). For more information, please refer to the chapter TROUBLE SHOOTING on p. 19.
3.5.2 Checking the water Level in the Room water sytem
The pressure of the Room water system should be checked once monthly. The pressure, shown on the external
pressure gauge, should be 1-1,5 bar. If the value is below 0.8 bar with cold water in the system, more water must
be added (applies to a closed expansion vessel). To find out where the pressure gauge is located.
You can use ordinary tap water for filling the Room water system. In some rare cases the water quality would be
unsuitable for this purpose (corrosive or calcareous water). In case of doubt, we would recommend that you call
your installation contractor.
Don’t use any water treatment additives for the Room water system!
Level is too low
Level is correct
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