en-54
en
5
. . Errors
See also:
"Safety instructions" on page 12
Danger:
d
All work on the inside of the unit may only be
carried out by personnel who are technically
qualified to do so.
Warning:
w
Before you begin: read the safety instructions.
5.1
Resolving simple problems
If you suspect an error, first try to resolve the problem, using
the table below. You do not need to be an expert for this.
If this fails to resolve the problem, there may be a fault; in that
case, alert the installer.
See also:
2.11 "Connecting the unit to the mains supply" on page 25
P
ROBLEM
P
ROBABLE
CAUSE
W
HAT
TO
DO
The unit does not work.
The unit has not been switched on
Turn the unit on
The unit has no power supply.
Check the mains supply:
• isolation switch;
• unit has power.
The unit functions differently
from expectations.
The unit is operating in a special mode
• Check which mode the unit is
operating in. (Register address
221)
The unit is not circulating
enough air.
One of the inlet sections and/or the
connected ventilation units is blocked.
Remove obstacles to the inlet and dis-
charge section.
