15
TROUBLESHOOTING
VALLOX DIGIT SE/SE VKL
© VALLOX • We reserve the right to make changes without prior notification.
Outdoor air coming to
the dwelling is cold.
SYMPTOM
REASON
DO THIS
• Air cools down in the attic ducts.
• The heat recovery cell is frozen, which is
why extract air cannot heat outdoor air.
• The post-heating radiator does not work.
• The extract air filter or the cell is clogged.
• The initial adjustment of ventilation has not
been done.
1
• Check the insulation of the attic ducts.
• If the heat recovery cell is frozen, check the setpoint for
freezing protection. The setpoint for freezing protection can
be raised by 1 or 2
°
C, or the sensor can be bent closer to
the cell, in which case the supply air fan stops earlier (see
the instructions for using the control panel in Section
3.3.23.). Thaw the cell before closing the door.
• If the post-heating radiator does not operate, check to see if
overheating protection prevents it from operating. Press the
overheating protection reset button (see page 14, Q), and
measure the temperature of supply air inside the unit when
the door is closed. If the radiator does still not work, contact
a maintenance company.
• Check that the filters and the heat recovery cell are clean.
Supply air fan keeps stopping
• HR cell antifreeze is in operation.
NOTE! If you decrease the setpoint too much, the
cell may freeze. Compare with list item 1.
2
• The fan stops more rarely and the efficiency of the heat
recovery cell gets better when the setpoint is decreased by
1 or 2
°
C. (See the instructions for using the control panel,
Section 3.3.23.)
Supply air fan stops and
starts too frequently.
• The difference between the stopping and
starting temperatures is too small.
• The preheating radiator does not work.
3
• Raise the difference between the stopping and starting tem-
peratures by 1 or 2
°
C. It extends the period between stop-
ping and starting. (See the instructions for using the control
panel, Section 3.3.22.)
• If the preheating radiator does not operate, check if over-
heating protection prevents it from operating: press the
overheating protection reset button, and measure the tempe-
rature of outdoor air inside the unit before the heat recovery
cell when the door is closed. If the radiator does still not
work, contact a maintenance company.
The maintenance reminder
symbol ( ) is displayed and
the unit operates otherwise
normally.
• The maintenance reminder lights up the
service reminder symbol in the main
display of the control panel at an interval
of approximately 4 months (factory
setting).
• You may change the interval (see the
instructions for using the control panel,
Section 3.3.21.).
4
• Check the cleanliness of the filters and the unit. If needed,
clean or replace the filters. Also check the external grille.
• Reset the maintenance reminder symbol to make it
disappear. (See the instructions for using the control panel,
Section 3.3.10.)
"Exh air sensor faulty"
message is displayed and
the unit is stopped.
• There is a fault in the freezing protection
sensor.
5
• Contact a maintenance company. Sensor mounting needs to
be checked and the sensor has to be replaced if necessary.
"Sup. air sensor faulty"
message is displayed and the
unit is stopped.
• There is a fault in the supply air sensor.
6
• Contact a maintenance company. Sensor mounting needs to
be checked and the sensor has to be replaced if necessary.
"Inp. air sensor faulty"
message is displayed and the
unit is stopped.
• There is a fault in the extract air sensor.
7
• Contact a maintenance company. Sensor mounting needs to
be checked and the sensor has to be replaced if necessary.
"Out air sensor faulty"
message is displayed and the
unit is stopped.
• There is a fault in the outdoor air sensor.
8
• Contact a maintenance company. Sensor mounting needs to
be checked and the sensor has to be replaced if necessary.
