Fault Finding - Grundfos MAGNA3 Installation And Operating Instructions Manual

16.3 Fault finding

A fault indication can be reset in one of the following ways:
• When the fault cause has been eliminated, the pump will revert to normal duty.
• If the fault disappears by itself, the fault indication will automatically be reset.
• The fault cause will be stored in the pump alarm log.
Warning and alarm codes
Pump communication fault (10)
Alarm
Forced pumping (29)
Alarm
Undervoltage (40, 75)
Alarm
Blocked pump (51)
Alarm
Dry running (57)
Alarm
Internal fault (72, 84, 155, 157)
Warning/alarm
Overvoltage (74)
Alarm
Internal sensor fault (88)
Warning
External sensor fault (93)
Warning
If the power supply cable is damaged, it must be replaced by the manufacturer, the manufacturer's service partner or
Caution
a similarly qualified person.
Fault
Communication fault between
different parts of the
electronics.
Other pumps or sources force
flow through the pump even if
the pump is stopped.
Supply voltage to the pump
too low.
The pump is blocked.
No water at the pump inlet or
the water contains too much
air.
Internal fault in the pump
electronics.
Supply voltage to the pump
too high.
The pump is receiving a signal
from the internal sensor which
is outside the normal range.
The pump is receiving a signal
from the external sensor which
is outside the normal range.
Automatic reset
Corrective actions
and restart?
Replace the pump, or call GRUNDFOS
Yes
SERVICE for assistance.
Check the system for defective non-return valves
and replace, if necessary.
Yes
Check the system for correct position of
non-return valves, etc.
Check that the power supply is within the
Yes
specified range.
Dismantle the pump, and remove any foreign
No
matter or impurities preventing the pump from
rotating.
Prime and vent the pump before a new start-up.
Check that the pump is operating correctly. If not,
No
replace the pump, or call GRUNDFOS SERVICE
for assistance.
Replace the pump, or call GRUNDFOS
Yes
SERVICE for assistance.
Check that the power supply is within the
Yes
specified range.
Check that the plug and cable are connected
correctly in the sensor. The sensor is located on
Yes
the back of the pump housing.
Replace the sensor, or call GRUNDFOS
SERVICE for assistance.
Does the electrical signal set (0-10 V or 4-20 mA)
match the sensor output signal?
If not, change the setting of the analog input, or
replace the sensor with one that matches the
setup.
Check the sensor cable for damage.
Yes
Check the cable connection at the pump and at
the sensor. Correct the connection, if required.
The sensor has been removed, but the analog
input has not been disabled.
Replace the sensor, or call GRUNDFOS
SERVICE for assistance.
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