DHP-AX – 40
VUBMI102
Message
Meaning
Cause
Remedy
RETURN LINE
SENSOR
Return sensor fault.
Electrical fault.
Contact your
installer.
HOT WATER
SENSOR
Fault in the hot water sensor.
No hot water production.
Electrical fault.
Contact your
installer.
ALARM
ROOM
SENSOR
The actual room temperature is
not displayed. To calculate the
supply temperature’s desired
value, use 20°C instead.
Electrical fault.
Contact your
installer.
ERR PHASE
SEQ.
The compressor in the heat
pump is operating in the
wrong direction and this means
that only the auxiliary heater is
maintaining heating.
The phase sequen-
ce changed when
changes were
made in the elec-
trical installation
of the house.
Contact your
installer.
HIGH RETURN The temperature of the water
that returns from the radiators
is too high and prevents
the heat pump from working
Insufficiently ope-
ned radiator/floor
loop thermostats.
Ensure that all
thermostat valves
are fully open.
