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Display messages CoolAir RT780
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8 Display messages
I
8.1 Control panel warnings
The system control unit has various functions for protecting the device and the
battery. If one of these protective functions has been triggered, this is shown by
the following codes on the display.
NOTE
When you start the vehicle or switch on several consumers at once, the
display text
LO may briefly appear.
Display
text
Description Cause Remedy
LO
The battery monitor has
detected low voltage.
The compressor switches
off immediately and the fan
is switched off after 20 to
30 seconds. The whole
system shuts down after
2minutes.
Connection voltage is too
low. The battery capacity is
not sufficient to operate the
system.
Brief under-voltage: No
action required.
The system switches itself
off: Charge the vehicle
battery or check if the
battery monitor has been
correctly set.
HI
The system has detected a
brief or constant over-
voltage.
A brief over-voltage may
occur when large electrical
consumers are switched off.
Constant over-voltage is the
result of an incorrect con-
nection voltage.
Brief over-voltage: No
action required.
If the display message
“HI” remains visible for a
longer period: Check the
vehicle electronics. Make
sure the connection
voltage is less than
30 volts.
HO
The system has detected a
brief electrical overload
and switches the
compressor off.
The current power require-
ment of the compressor is
too high.
The brief overload is
compensated by the
system by switching off
the compressor. The
compressor starts up
again after a short time.
The system has detected a
too big inclination.
The compressor is
switched off. 5 minutes
later, the entire system will
be switched off.
The compressor (driver's
cab) is tilted too far.
Once the compressor has
been returned to its nor-
mal position, the system
can be switched on again.
16


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