Code 56 (Underload, Current Sensor Measures A Value Too Low); Code 57 (Missing Water In The Application); Code 69 (Winding Temperature Too High); Code 72 (Internal Fault) - Grundfos LC 231 Installation And Operating Instructions Manual

Related information
6.17.4 Setting the motor protection with Grundfos GO Remote
8.11 Code 56 (Underload, current sensor measures a
value too low)
• Alarm code 56 is shown on the display.
• The alarm symbol on the display turns red and the pump stops.
• Alarm code Underload, current sensor measures a value
too low is displayed in Grundfos GO Remote.
Cause
The measured current is too low.
Remedy
• Make sure that the nominal pump current is configured
correctly in Grundfos GO Remote.
• Make sure that the pump is connected to the pump terminals
on the product.
• Make sure that the pump cable is not damaged.
• Make sure that the pump rating is within the specified current
or power rating of the product.

8.12 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 stop level.

8.13 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
6.17.1 Overheat protection

8.14 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.

8.15 Code 76 (Internal fault)

• Alarm code 76 is shown on the display.
22
• 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.

8.16 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.
Remedy
• Replace the control unit.
• Contact Grundfos or an authorised service workshop.

8.17 Code 85 (Internal fault)

• Alarm code 85 is shown on the display.
• The alarm symbol on the display turns red and the pump
stops.
• Alarm code Internal fault is displayed in Grundfos GO
Remote.
Cause
Internal memory fault.
Remedy
• Contact Grundfos or an authorised service workshop.

8.18 Code 117 (Door opened)

• Warning code 117 is shown on the display if you press
the Up or Down button.
• The warning symbol on the display turns yellow and the
operating mode of the pump is unchanged.
• Warning code Door opened is displayed in Grundfos GO
Remote.
Cause
The door to the control-unit room has been opened.
Remedy
• Check the room with the control unit.

8.19 Code 157 (Real-time clock monitoring)

• Warning code 157 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 Real-time clock out of order is displayed in
Grundfos GO Remote.
Cause
The battery for the real time clock is missing or worn out so the
product is unable to maintain time and date.
Remedy
• Replace the battery with a new one.

8.20 Code 159 (Communication error CIMxxx)

• Warning code 159 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 Communication error CIMxxx is displayed in
Grundfos GO Remote.