VALLOX 90 SE
14
TROUBLESHOOTING
Outdoor air coming to
the dwelling is cold.
SYMPTOM
REASON
• 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 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
freeze protection. The setpoint for freeze 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, section 3.3.20).
Thaw the cell before closing the door.
• Check that the filters and the heat recovery cell are clean.
Supply air fan keeps
stopping.
• The stopping of the supply air filter is acti-
ve.
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 3.3.20.)
Supply air fan stops and
starts too frequently.
• The difference between the stopping and
starting temperatures is too small.
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 3.3.19.)
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 set-
ting).
• You may change the interval (see the
instructions for using the control panel, sec-
tion 3.3.18).
4
• Check the cleanliness of the filters and the unit. If needed,
clean or replace the filters. Also check the external grille.
• Acknowledge the maintenance reminder symbol to make it
disappear. (See the instructions for using the control panel,
section 3.3.7.)
"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. The sensor installation
must be checked and if necessary the sensor replaced.
"Inp. 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. The sensor installation
must be checked and if necessary the sensor replaced.
"In air sensor faulty" message
is displayed and the unit is
stopped.
7
• Contact a maintenance company. The sensor installation
must be checked and if necessary the sensor replaced.
"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. The sensor installation
must be checked and if necessary the sensor replaced.
DO THIS
• There is a fault in the extract air sensor.
Summary of Contents for 90 SE L
Page 17: ......
