Technical data

Rittal Modular Safe LMS 9.3 Operation and functionality
We reserve the right to make technical changes Version 2.2
Operator Manual Page 48
Display
screen
System message Possible cause Measures to rectify the fault
Compressor overloaded
(inner winding protection)
No action required; unit switches
on again independently
A11 Compressor
Defective (check by measur-
ing the winding resistance)
Exchange by refrigeration engi-
neer
A12
Condenser temperatu-
re sensor
Open or short circuit Replace
A13
Ambient temperature
sensor
Open or short circuit Replace
A14
Temperature sensor
Icing
Open or short circuit Replace
A15
Temperature sensor
Condensate warning
Open or short circuit Replace
A16
Temperature sensor
Internal temperature
Open or short circuit Replace
A17 Phase monitoring
For three-phase devices
only: Incorrect rotary
field/phase absent
Exchange two phases
A18 EPROM error New board obstructed
Software update needed (only
following board installation with
more recent software): enter the
programming level with Code
22; press button 1 and confirm
with “Set” until “Acc” appears.
Then disconnect the unit from
the mains and re-connect.
A19 LAN/Master-Slave Master and slave not linked Check setting and/or cable
A20 Voltage drop Error display not shown Result is stored in the log file
Connection problem be-
tween display and controller
board
Reset: Switch power supply off,
then switch on again after ap-
prox. 2 sec.
E0 Display message
Cable defective; connection
loose
Exchange the boards
OL Overload Ambient parameters or heat loss outside of the applicable limits
LH Low heat Minimal heat loss inside
rSt Reset Manual device reset required
Resetting the Comfort controller
After the occurrence of faults A03, A06 and A07, you will need to reset the Comfort controller.
• Press buttons 1 (σ) and 3 (τ) simultaneously for 5 seconds.
The system messages will disappear and the temperature display will be shown.
4.2.5 Operation of the Liquid Cooling Package and the Outdoor unit with Inverter
technology
Information about the operation of the Liquid Cooling Package and of the Outdoor unit with Inverter technol-
ogy can be found in the manufacturer’s instruction.