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