Liquisys M CUM223/253 Diagnostics and troubleshooting
Endress+Hauser 81
7.4 Instrument specific errors
The following table helps you during the diagnosis and points to any spare parts required.
Depending on the degree of difficulty and the measuring equipment present, diagnosis is
carried out by:
• Trained operator personnel
• The user's trained electrical technicians
• Company responsible for system installation/operation
• Endress+Hauser Service
Information on the exact spare part designations and on how to install these parts can be
found in the "Spare parts" section.
Error Possible cause Tests and/or remedial measures Execution, tools, spare parts
Device cannot be
operated, display value
9999
Operation locked
Press CAL and MINUS keys
simultaneously.
See "Function of keys" section.
Display dark, no light-
emitting diode active
No line voltage Check whether line voltage is present. Electrical technician/e.g. multimeter
Supply voltage wrong/too low
Compare actual line voltage and
nameplate data.
User
(data for energy supply company or
multimeter)
Connection faulty
Terminal not tightened;
insulation jammed;
wrong terminals used.
Electrical technician
Device fuse defective
Compare line voltage and the nameplate
data and replace fuse.
Electrical technician/suitable fuse;
see drawing in "Spare parts" section.
Power unit defective Replace power unit, note variant.
On-site diagnosis by Endress+Hauser
Service, test module necessary
Central module defective Replace central module, note variant.
On-site diagnosis by Endress+Hauser
Service, test module necessary
CUM253: ribbon cable, item 310
loose or defective
Check ribbon cable, renew if necessary. See "Spare parts" section.
Display dark, light-
emitting diode active
Central module defective
(module: LSCH/LSCP)
Renew central module, note variant.
On-site diagnosis by Endress+Hauser
Service, test module necessary
Display is on but
– No change in display
and/or
– Device cannot be
operated
– Missing pixels in
display
Device or module in device not
correctly mounted
CUM223: reinstall module.
CUM253: reinstall display module.
Perform with the aid of the installation
drawings in the "Spare parts" section.
Operating system in unpermitted
mode
Switch device off and then on again.
Poss. EMC problem: if this persists, check
the installation.
Device gets hot
Voltage wrong/too high
Compare line voltage and nameplate
data.
User, electrical technician
Power unit defective Replace power unit.
Diagnosis only by Endress+Hauser
Service
Incorrect meas. turbidity
and/or temperature
Transmitter module defective
(module: MKT1), please first carry
out tests and take measures as per
the "Process errors without
messages" section to make sure that
the error is not in the cabling or in
the sensor
Measuring input test:
Simulation of the sensor is not possible.
Test the input with new or different
sensor.
If test negative: replace module (note
variant).
Perform with the aid of the exploded
view drawings in the "Spare parts" section.
If test positive: check peripherals once
more.
Erroneous data transfer Replace module LSGA (AC) or LSGD (DC) See "Spare parts" section.
Data transfer disturbed (EMC)
Check cable routing. Separate sensor
cable from supply cables.
Connect sensor cable screen to "S"
terminal , do not ground.
Wrong sensor cable / cable too long
Max. line length with extension is 200 m
(656 ft.); use only cable type CYK81
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