24
6 Troubleshooting
Fault
Cause
Solution
Fan not changing
rotation direction.
Control unit operating in quick
ventilation mode.
• Select eco mode (heat recovery) on the
programming unit.
Fan faulty.
• Replace the fan.
Control unit or power supply
unit faulty.
• Replace the control unit or power supply
unit.
Fan not working.
No power supply.
• Check the power supply.
Installation or maintenance
fault.
• Check the fan connector is seated
properly.
• Check the cables.
Fan faulty.
• Replace the fan.
Control unit or power supply
unit faulty.
• Replace the control unit or power supply
unit.
Increased noise in
standard mode.
Rotor blades dirty.
• Clean the rotor blades.
• Clean the ventilation system.
Foreign bodies in the fan.
• Remove foreign bodies.
Low air flow rate.
Inside cover closed.
• Open the inside cover.
Filter dirty.
•
Clean or replace the filter.
Heat exchanger dirty.
• Clean the heat exchanger.
• Clean the ventilation system.
Supply air is cold.
Control unit operating in quick
ventilation mode.
• Select eco mode (heat recovery) on the
programming unit.
Heat exchanger not in use.
• Replace the heat exchanger.
7 Environment & disposal
The crossed-out wheelie bin symbol indi-
cates that the product must not be disposed
of with household waste.
Dispose of the product in accordance with
applicable local recycling regulations. Dis-
posing of the product separately helps re-
duce incinerated and landfill waste volumes,
and reduces the impact on environmental
and human health. Sort packaging materials
and dispose of them accordingly.
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