Diagnostics and troubleshooting Waterpilot FMX21
64 Endress+Hauser
10 Diagnostics and troubleshooting
10.1 Troubleshooting
General errors
Error Possible cause Solution
Device is not responding. Supply voltage does not match the
specification on the nameplate.
Apply correct voltage.
Supply voltage has incorrect polarity. Reverse polarity of supply voltage.
Connecting cables are not in contact
with the terminals.
Check the connection of the cables
and correct if necessary.
Output current < 3.6 mA Signal line is not wired correctly.
Electronics unit is defective.
Check wiring.
Device measures incorrectly. Configuration error Check and correct parameter
configuration (see below).
HART communication is not
working.
Communication resistor missing or
incorrectly installed.
Install the communication resistor
(250 Ω) correctly.
Commubox is not properly connected. Connect Commubox correctly .
Commubox is not set to "HART". Set Commubox selector switch to
"HART".
10.2 Diagnostic events
10.2.1 Diagnostic message
Faults detected by the self-monitoring system of the measuring device are displayed as a
diagnostic message in alternation with the measured value display.
Status signals
The table → 65 lists the messages that may occur. The ALARM STATUS parameter
shows the message with the highest priority. The device has four different status
information codes according to NE107:
A0013956
"Failure"
A device error has occurred. The measured value is no longer valid.
A0013957
"Maintenance required"
Maintenance is required. The measured value remains valid.
A0013959
"Function check"
The device is in service mode (e.g. during a simulation).
A0013958
"Out of specification"
The device is being operated:
• Outside its technical specifications (e.g. during warm-up or cleaning).
• Outside the parameter configuration undertaken by the user (e.g. level outside of configured span)
Diagnostic event and event text
The fault can be identified by means of the diagnostic event.
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