DHP-AX – 39
VUBMI102
z
The room sensor’s display shows the actual indoor temperature in normal mode.
z
To display the outdoor temperature press the up and down buttons at the same
time.
z
To set the desired indoor temperature press either the up or down button.
z
If the heat pump has an active alarm the text AL appears in the display.
Troubleshooting
10
Alarm
10.1
In the event of an error message try restarting the installation using the installation’s
safety switch. If restarting the heat pump does not help try rectifying the problem
using the table below. Contact your installer, see section ”13 References”, if you are
unable to rectify the problem yourself.
Message
Meaning
Cause
Remedy
LOW
PRESSURE
ERROR
LOWPRESS ERROR - The com-
pressor stops and there is no
hot water production.
Not enough fluid
in the brine sys-
tem. Air in the
brine system.
Blocked filter in
the brine system.
Contact your
installer.
HIGH
PRESSURE
ERROR
HIGHPRESS ERROR - The com-
pressor stops and there is no
hot water production.
Insufficiently ope-
ned radiator/floor
loop thermostats.
Air in the heating
system. Blocked
strainer in the hea-
ting system.
Open radiator /
floor loop thermo-
stats. Top up and
bleed the heating
system or contact
your installer.
MOTOR P
ERROR
Motor protection cut out. The
compressor stops and there is
no hot water production.
Power failure cau-
sed by a blown
fuse or the safety
switch has deploy-
ed.
Check the fuses
and reset the
safety switch.
OUTDOOR
SENSOR
Fault in outside sensor. To cal-
culate the supply temperature’s
desired value, use 0°C instead.
Electrical fault.
Contact your
installer.
SUPPLY LINE
SENSOR
Supply line sensor error.
Everything stops except the
circulation pump for the hea-
ting system.
Electrical fault.
Contact your
installer.
