Message Meaning
ERR PHASE SEQ. Can be displayed in conjunction with interference in the
mains network, for example after a temporary power cut.
Reset the alarm as follows. If necessary switch off the
power supply for a minute or two.
Other alarm mes-
sage
Reset the alarm as follows. If the alarm remains contact a
service technician.
Resetting the alarm
For alarms that are not reset automatically acknowledgement is
required. Acknowledge the alarm by setting the heat pump to operat-
ing mode OFF and then back to the desired operating mode.
6.2 Check the water level in the heating circuit
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.
Note! Do not use any additives for water treatment in the
heating system’s water!
Note! The closed expansion tank contains an air filled bladder
that absorbs variations in the heating system’s volume. Under
no circumstances may it be drained of air.
6.3 Check the brine circuit level
The brine circuit must be filled with the correct amount of fluid other-
wise operational interruptions may occur.
22 – User manual VUBMA902
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