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8
Regular checks
8.1
Checking operation
During normal operation, the alarm indicator lights green continuously to show
that everything is OK. When the alarm is triggered, it flashes green at the same time
as a text message is shown in the display.
Figure 14: Flashing alarm indicator in the event of an alarm.
Regularly check the alarm indicator to ensure that the installation is working cor-
rectly. It is not always the case that you will notice a problem with the installation,
for example, in the event of a fault with the compressor the auxiliary heater starts
automatically (operating mode AUTO). For further information about alarms, see
section "10 Troubleshooting".
8.2
Checking the water level in the heating system
The line pressure of the installation must be checked once a month. The external
manometer must show a value between 1-1.5 bar. If the value is below 0.8 bar,
when the water in the heating system is cold, the water must be topped up (applies
in the event of an empty expansion tank).
You can use normal tap water when topping up the heating system. In certain
exceptional cases the water quality may be so poor (for example very hard water)
that it is not suitable for filling the heating system. If unsure, contact your installer,
see section "13 References".
ALARM
LOW PRESSURE ERROR
VUBMI102
DHP-AX – 35
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