Code 51 (Blocked); Code 57 (Missing Water In The Application); Code 69 (Winding Temperature Too High); Code 72 (Internal Fault) - Grundfos LC 231 Manual Del Usuario

Cause The pump is clogged.
The blockage causes the motor
current to rise, which could damage
the pump.
Remedy • Remove the blockage.
• Check the pit conditions to
ensure blockage is not
possible again.
Related information
6.15.2 Overload protection

8.10 Code 51 (Blocked)

• Alarm code 51 is shown on the display.
• The alarm symbol on the display turns red and
the pump stops.
• Alarm code Blocked is displayed in Grundfos
GO Remote.
Cause The pump is blocked.
The pump cannot rotate due to a
blockage.
Remedy • Dismantle the pump by
removing the pump head, and
remove any blockage or
impurities preventing the pump
from rotating.
• Check the water quality to
eliminate the risk of lime
precipitation.
Before dismantling the pump,
drain the system or close the
isolating valves on either side
of the pump. The pumped
liquid may be scalding hot and
under high pressure.
Related information
6.15.4 Setting the motor protection with Grundfos
GO Remote
8.11 Code 57 (Missing water in the
application)
• Alarm code 57 is shown on the display.
• The alarm symbol on the display turns red and
the pump stops.
• Alarm code Dry Run is displayed in Grundfos
GO Remote.
Cause Low water level in the pit and the
pump stops due to the dry-
running function.
Remedy • Check and configure the
sensor for stop level.
8.12 Code 69 (Winding temperature too
high)
• Alarm code 69 is shown on the display.
• The alarm symbol on the display turns red and
the pump stops.
• Alarm code Winding temperature too high is
displayed in Grundfos GO Remote.
Cause The pump is clogged, causing
the pump to use more current
and thereby overheat.
Remedy • Remove the blockage.
Cause The pump has run for too long.
Remedy • Allow the pump to cool down.
• Adjust the distance between
start and stop levels.
Related information
6.15.1 Overheat protection

8.13 Code 72 (Internal fault)

• Alarm code 72 is shown on the display.
• The alarm symbol on the display turns red and
the pump stops.
• Alarm code Internal hardware fault is displayed
in Grundfos GO Remote.
Cause Fault in internal hardware.
Remedy • Contact Grundfos or an
authorised service workshop.

8.14 Code 76 (Internal fault)

• Alarm code 76 is shown on the display.
• The alarm symbol on the display turns red and
the pump stops.
• Alarm code Drive unit communication fault is
displayed in Grundfos GO Remote.
Cause Internal communication fault.
Remedy • Contact Grundfos or an
authorised service workshop.

8.15 Code 84 (Memory storage media faulty)

• Warning code 84 is shown on the display if you
press the Up or Down button.
• The warning symbol on the display turns yellow
and the pump's operating mode is unchanged.
• Warning code Memory storage media faulty is
displayed in Grundfos GO Remote.
Cause An error in the internal memory
has been detected.
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