Levelflex M 15 Trouble-shooting
Endress+Hauser 77
A261 HF cable defective HF cable defective or HF connector loose check HF connector, replace cable if
defective
W275 offset too high temperature at the electronics too high or
HF module defective
check temperature, replace HF
module if defective
W512 recording of mapping -
please wait
recording active wait a few seconds until alarm
disappears
W601 linearization ch1 curve not
monotone
linearization not monotonously increasing correct linearization table
W611 less than 2 linearization
points for channel 1
number of entered linearization points < 2 correct linearization table
W621 simulation ch. 1 on simulation mode is active switch off simulation mode
E641 no usable echo
channel 1
check calibr.
echo lost due to application conditions or
buildup on probe
check basic setup;
clean probe (see Operating
Instructions, Troubleshooting)
W650 signal/noise ratio too low
or no echo
noise amplitude too high eliminate electromagnetic
interference
E651 level in safety distance - risk
of overfill
level in safety distance alarm will disappear as soon as level
leaves safety distance
perform reset where necessary
A671 linearization ch1 not
complete, not usable
linearization table is in edit mode activate linearization table
W681 current ch1 out of range current out of range
(3.8 mA to 21.5 mA)
check basic setup and linearization
Code Description Possible cause Remedy
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