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4 Loosen the bracket holding the fan and pull the fan out carefully
5 Clean the fan using a cloth or a soft brush. Do not use water. White spirit
can be used to remove obstinate settlements. Allow to dry properly be-
fore remounting.
4.6
Duct System Maintenance
4.6.1
Cleaning extract louvres and supply air diffusers
The system supplies fresh air to your home and extracts the used indoor air via the duct system and diffusers/louvres.
Diffusers and louvres are mounted in ceilings/walls in bedrooms, living room, wet rooms, WC etc. Remove diffusers
and louvres and wash in hot soapy water as required (diffusers/louvres must not be exchanged). Cleaning of diffusers/
louvres can be done as necessary.
4.6.2
Checking the outdoor air intake
Leaves and pollution could plug up the air intake grille and reduce the capacity. Check the air intake grille, and clean as
necessary. It is recommended to do this at least twice a year.
4.6.3
Checking the roof cowl (if fitted)
The roof cowl (if fitted) connected to the exhaust air duct needs to be checked at least twice a year and cleaned if
necessary.
4.6.4
Checking and cleaning the duct system
Dust and grease deposits may build up in the duct system, even if required maintenance such as changing of filters is
being carried out. This will reduce the efficiency of the installation.
The duct runs should therefore be cleaned/changed when necessary. Steel ducts can be cleaned by pulling a brush
soaked in hot soapy water through the duct via diffuser/louvre openings or special inspection hatches in the duct sys-
tem (if fitted).
It is recommended to do this every 5 years and is normally carried out by authorized companies specialized in this area.
5
Troubleshooting
If problems should occur, please check the items below before calling your service representative.
Fans do not start
1. Check the control panel for alarms.
2. Check that all fuses and fast couplings are connected (main power supply and fast couplings for supply and extract
air fans).
3. Check the week schedule. Fans may be set to
OFF
in the Schedule airflow settings menu.
Reduced airflow
1. Check the control panel for alarms. Some alarms can reduce the airflow to
LOW
if active.
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