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8.5 Trouble shooting
Fans do not start
1. Check that main supply gets to the unit.
2. Check that all connections are working (all connections in terminal box and fast couplings of supply and extract air fans).
3. If only the supply fan is switched off and if the external temperature is below zero, maybe the no-frost thermostat is activated: wait until the thermostat is
deactivated.
Reduced airflow
1. Check setting of fan speed in the terminal box or on the remote controls.
2. Check filters. Change of filters required?
3. Check grilles. Re-setting or cleaning of grilles required?
4. Check fans and heat exchange block. Cleaning required?
5. Check if air intake and exhaust have been clogged.
Fan noise/vibrations
1. Clean fan impellers. Cleaning required?
2. Check that the fans are firmly in place within the unit
3. Check that the unit is firmly fixed to the mounting bracket.
Excessive air noise
1. Check setting of fan speed in the terminal box or on the remote controls.
2. Check grilles. Re-setting or cleaning of grilles required?
Gurgling noise
1. Drainage connections have not been installed correctly.
2. Drainage connections below the unit has a too low water level, fill it up with water.
Unpleasant smell
1. Drainage connections have not been installed correctly.
2. Drainage connections below the unit has a too low water level, fill it up with water.
3. Check filters. Change of filters required?
4. Check grilles. Cleaning necessary?
Water leakage near the unit
1. Drain connections and elbows/plugs have not been installed correctly. Sealing necessary?
2. Drain connections and elbows/plugs are dirty. Cleaning necessary?
Fig. 8.o
Fig. 8.p
Fig. 8.q
Fig. 8.r
