9 Malfunctions and troubleshooting
Personnel:
n
Operator
n
Specialist
n
Service personnel
n
T
rained personnel
Protective equipment:
n
Protective gloves
n
Protective eyewear
n
Safety shoes
9.1 General troubleshooting and fault rectification
Fault description Cause Remedy
No display LMI03 is not switched on
Switching on the LMI03
Connection transformer defective
Replace the connection transformer
Control PCB defective
Replace WWC PCB
Date/time is not saved Defective or empty CMOS battery
Replace WWC PCB
Conductivity display is not stable Air bubbles at the measuring cell
installation point
Check the installation scenario for air
bubbles or insuf
ficient pipe filling.
No post-proportioning despite under-
concentration
Proportioning lock input is not closed
Check the proportioning lock
connection on the unit and system.
Setpoint setting has changed
Correct the setpoint setting
Product storage container is empty
Check the contents level and level
detection device
Pre-proportioning does not start Release signal ‘PP start’ not present
Check the release signal at the
system
Proportioning lock also effective on pre-
proportioning (if configured)
Check the proportioning lock signal
Product storage container is empty
Check the contents level and level
detection device
Pre-proportioning delay time set
Check the time setting, if necessary
9.2 Fault messages
The acoustic alarm can be switched off by pressing any button on the front of
the unit. The alarm message on the display remains visible until the error has
been resolved.
Malfunctions and troubleshooting
69 MAN049432 Rev. 03-03.2024
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