Diagnostics and troubleshooting Liquisys M CLM223/253
88 Endress+Hauser
Error Possible cause Tests/remedial action Tools, spare parts
Bus user (master) has
wrong address or address
assigned twice
Bus user (slave) has
wrong address
Bus line not terminated
Line problems (too long,
cross-section too small,
not shielded, shield not
grounded, wires not
twisted)
Bus voltage too low
(Bus voltage typ. 24 V DC
for non-Ex)
The voltage at the device's PA/DP
connector must be at least 9 V
8.4 Device-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/remedial action Execution, tools, spare
parts
Device cannot be
operated, display
value 9999
Operation locked Press CAL and MINUS keys
simultaneously.
See the "Key functions"
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 exploded drawing in
the the "Spare parts" section
Power unit defective Replace power unit, note
version
Onsite diagnosis by Endress
+Hauser Service, test module
necessary
Central module defective Replace central module, note
version
Onsite diagnosis by Endress
+Hauser Service, test module
necessary
Field device: ribbon cable
loose or defective
Check ribbon cable, replace if
necessary
See the "Spare parts" section
Display dark, light-
emitting diode
active
Central module defective
(module: LSCH/LSCP)
Replace central module, note
version
Onsite diagnosis by Endress
+Hauser Service, test module
necessary
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