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TROUBLE SHOOTING
1. Outdoor air coming to the dwelling is cold.
REASON
• Air cools down in the attic ducts.
• The heat recovery cell is frozen, which is why extract air cannot heat outdoor air.
• The preheating radiator does not work.
• The extract air filter or cell is clogged.
• The initial adjustment of ventilation has not been done.
DO THIS
• Measure the temperature of supply air in the unit and compare it with the air coming
• Check the insulation of the attic ducts.
• Check the operation of the defrost thermostat and preheating resistor (see Section
• Check that the filters and the heat recovery cell are clean.
• Check the initial adjustment.
2. Supply air fan keeps stopping
REASON
The heat recovery cell defrost function works and prevents the cell from freezing.
DO THIS
If you want the fan to stop at temperatures lower than the preset value, you can decrease
the threshold value of the thermostat by 1 to 2°C.
NOTE!
If you decrease the threshold value too much, the cell may freeze.
See Section 1.
VALLOX 90SC
from the valve.
2.6 Defrosting on page 5). You can turn the defrost thermostat clockwise. In this case
there will probably be no freezing, but extract air can be too warm when going out.
The defrost thermostat can also be turned anticlockwise. In this case, the risk of
freezing of the heat recovery cell will increase. According to the factory setting, the
defrost thermostat works at +5°C.
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