6. Go back to the Er:xxx display by pressing the
h
key. Press the
key: the CLR parameter flashes after the errors. 000 corresponds to
the PCB selected.
Clear the error memory by pressing the
key.
7. Exit the Malfunctions menu by pressing the
h
key.
9.3
Fault finding
Problems
Probable causes
Corrections
The radiators are cold. The heating set point tem
perature is too low.
Increase the value of the room temperature set point or, if a room ther
mostat is connected, increase the temperature on it.
The heating mode is deac
tivated.
Activate the heating mode.
The radiator valves are
closed.
Open the valves on all radiators connected to the heating system.
The heat pump is not op
erating.
Check that the heat pump is switched on.
Check the fuses and switches on the electrical installation.
The water pressure is too
low (< 1 bar).
Top up the system with water.
There is no domestic
hot water.
The domestic hot water
set point temperature is
too low.
Increase the domestic hot water set point temperature.
The domestic hot water
mode is deactivated.
Activate the domestic hot water mode.
The appliance is in re
duced domestic hot water
mode
Check and modify the comfort and reduced time ranges for the domes
tic hot water.
Adapt the domestic hot water set point temperature.
The shower head is re
stricting the water flow.
Clean the shower head; replace it if necessary.
The heat pump is not op
erating.
Check that the heat pump is switched on.
Check the fuses and switches on the electrical installation.
The water pressure is too
low (< 1 bar).
Top up the installation with water.
Significant variations in
domestic hot water
temperature
Insufficient water supply
Check the water pressure in the installation.
Open the valve.
The domestic hot water
hysteresis is too high
Contact the professional responsible for maintenance of the heat pump.
The heat pump does
not work.
The heating set point tem
perature is too low.
Increase the value of the room temperature set point or, if a room ther
mostat is connected, increase the temperature on it.
The heat pump is not op
erating.
Check that the heat pump is switched on.
Check the fuses and switches on the electrical installation.
The water pressure is too
low (< 1 bar).
Top up the system with water.
An error code appears on
the display.
Correct the error if possible.
The heat pump runs
short-cycling in do
mestic hot water mode
The temperature set point
is too low
Increase the set point
The water pressure is
too low (< 1 bar).
Not enough water in the
installation.
Top up the system with water.
Water leak.
Contact the professional responsible for maintenance of the heat pump.
Fig.52
MW
-1
0
0
0
6
9
0
-1
9 Troubleshooting
7611444 - v06 - 04032019
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