Danfoss – 41VUBMA102
Message Meaning Cause Remedy
SENSOR HOT
WATER
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
sequence changed
when changes
were made in the
electrical installa-
tion 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
opened radiator/
floor loop thermo-
stats.
Ensure that all
thermostat valves
are fully open.
The following table only applies to installations that use ground water as refrigerant.
Message Meaning Cause Remedy
BRINE OUT Brine lower than set tempera-
ture. The compressor stops and
there is no hot water produc-
tion.
The lowest set
brine temperature
has been reached.
The system resets
itself when the
temperature has
risen to the set
value.
BRINEFLOW
LOW
The flow switch was not active
during the latest start. The
compressor stops and there is
no hot water production.
Brine’s flow is low. Contact your
installer.
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