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4 Troubleshooting
FAULT
If the fans are not working or cannot be
adjusted
If the supply air feels too cold
If the air flow rate has been seriously reduced • The filters (item nos. 1, 2) may be clogged by dirt. Clean or re-
If none of this helps, please contact your supplier for service. Please state the serial number on the rating plate inside
the unit (open the door).
5 Cleaning - Maintenance
Before opening the door of the heat recovery system or carrying out maintenance on the kitchen hood: switch off the
heat, let the fans continue for three minutes to remove hot air, remove the power from the unit and wait 2 minutes
before opening the doors.
Doors: Opened by loosening both eccentric hooks and releasing the hooks. The doors can then be completely removed.
Fans:
Item nos. 9 and 10/Chap. 6. General Drawings. The fans normally do not need to be inspected.
If necessary, they can be cleaned with a small brush and compressed air, if possible.
NB! Do not use water.
Disassemble the fans as follows:
L4:
Pull out the quick-release contacts. The fan with the visible quick-release contact is loosened by unscrewing the 4
screws in the round motor plate and carefully pulling the motor out of the motor housing. For the fan with the visible
intake opening, the screw for the rail in the side wall must be removed and the rail pushed down as far as possible. The
entire fan housing can then be released and turned around. The fan can then be released with 4 screws, like the fi rst
fan.
L7:
The fan with the visible quick-release contact is loosened by unscrewing the 3 screws in the end of the fan housing
and carefully pulling the fan out. For the fan on which the screws are on the opposite side, the entire fan housing must
be loosened by unscrewing the mounting rails (2 screws) on each side of the fan, thus releasing it. The fan can then be
released with 3 screws, like the fi rst fan. The fan can be disassembled most easily if the exchanger cassette is removed
fi rst.
DO THE FOLLOWING
• Check that the power plug is correctly inserted in the power point.
• Check that the fuses in the electrical cabinet are switched on.
• The overheating thermostat(s) (item nos. 7, 8/ Chap. 6 General
Drawings) may have been triggered. Remove the white plastic
cover and press in the white reset button.
• Check that the thermoguard (item no. 3) is connected.
• Check that the heating switch is on and a summer cassette is not
loaded.
• The heating thermostat (item no. 4) can be set to a higher
temperature.
• Check that the thermoguard (item no. 3) is connected.
• The overheating thermostat(s) (item nos. 7, 8) may have been
triggered. Remove the white plastic cover and press in the white
reset button.
• Check that the heating switch is activated
place them. See under "Cleaning - Maintenance" below.
• The grille in the outdoor air cap may be clogged. See under
"Cleaning - Maintenance".
5
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