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 cell is clogged.
• The initial adjustment of ventilation has not
been done.
1
• Measure the temperature of supply air in the unit and com-
pare it with the air coming from the valve.
• Check the insulation of the attic ducts.
• If the heat recovery cell is frozen, check the setpoints for
heat recovery cell freeze protection and preheating (see
Section 2.4.). 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. Thaw the
cell before closing the door.
• If the post-heating radiator does not operate, check to see if
overheat protection prevents it from operating: press the
black button at the end of the radiator. If the protector has
tripped, you hear a click when pressing the button. Pressing
the button resets the radiator in working order after the
tripping of the overheat protector.
• Consult an expert to find out why the overheat protector
tripped.
• Check that the filters and the heat recovery cell are clean.
• Check the initial adjustment.
Supply air fan keeps
stopping.
• The stopping of the supply air filter is
active.
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.
NOTE! If you decrease the setpoint too much, the cell may freeze.
Compare with list item 1.
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 the
stopping and starting of the supply air fan.
• If the (electric) preheating radiator does not function, check
if overheat protection prevents it from operating: press the
black button at the end of the radiator. Also check whether
the preheating radiator has been taken into use and adju-
sted correctly.
• If the radiator does still not work, i.e. the fan does not stop
more rarely, contact a maintenance company.
VKL unit has stopped.
• Antifreeze of the water-circulating radiator
is active.
NOTE! If there is no non-freezing solution in the water
of the radiator, the radiator is at risk of freezing and
breaking down. If the radiator breaks down, there is a
risk of water damage.
4
• Immediately troubleshoot the situation. Check if the
circulation pump is broken, the boiler out of operation etc.
The situation may pass by itself as soon as supply air
temperature exceeds 10
°
C, but do not wait till it happens.
Filter guard indicator is lit
and the unit operates
otherwise normally.
• The pressure in the filter guard (pressure
difference switch) has risen above the
adjustment value or fan speed is 3 or 4.
5
• If fan speed is 3 or 4, no maintenance activities are needed.
• If fan speed is 1 or 2, check the cleanliness of the filters and
the unit, and clean or replace the filters if needed. Also
check the external grille.
11
TROUBLESHOOTING
VALLOX 132 E/VKL
© VALLOX • We reserve the right to make changes without prior notification
Summary of Contents for 132 E Series
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