25
NRS 1-51 - USA - Installation & Operating Manual -
850695-00
Diagnosis
Indication 1 and
action
Indication 2 Error
Corrective action
Alarm 1 LED and
diagnostic LED 1 light
up.
press and hold
button 1
Diagnostic
LED 1
flashes
Error in level electrode 1,
error in level switch,
wiring error,
measuring voltage error.
- Check wiring,
- replace level switch.
Diagnostic
LED 2
flashes
Error in level electrode 1,
error in level switch,
wiring error.
Diagnostic
LED 3
flashes
External voltage error, boiler
wall has no PE.
Provide shielding and grounding,
connect boiler to PE.
Alarm 1 or 2 LED and
diagnostic LED 3 light
up,
press and hold
button 1 or 2
Diagnostic
LED 1
flashes
Processor error, standby
error.
Pay attention to the operating instruc-
tions for the SRL logic unit. Replace
level switch.
Diagnostic
LED 2
flashes
Internal voltage error.
Replace level switch.
Diagnostic
LED 3
flashes
Relay error.
Once the error has been rectified, the level switch reverts to normal operation.
After troubleshooting, please switch the supply voltage off and on again after approx. 5 s.
Further fault indications
Status
Diagnosis
Function
Next action
Error on evaluation of level
electrode 1, channel 1
Diagnostic LED 1
and
Alarm 1 LED light up
Output contacts open
without a delay.
Signal output 1 closes
without a delay.
Next:
Next:
Press button 1
Error detected in level
switch
Diagnostic LED 3
and
Alarm 1 or 2 LED
light up
Output contacts open
without a delay.
Signal outputs 1 + 2 close without
a delay.
Next:
Press button 1 or
button 2
Fault indications and troubleshooting
Indications, diagnosis and corrective action
Level electrode errors
Status and indication
Error
Corrective action
Water level sufficient. Red LED
for level electrode 1 lights up!
Control circuit open.
The insulator of the level electrode
is dirty or faulty.
Clean level electrode, replace if
necessary.
