English (GB)
21
9.5 Fault finding tables
9.5.1 Faults indicated on the pump and in Grundfos GO Remote
9.5.2 Faults with no indication on the pump and Grundfos GO Remote
Alarms
Fault
Remedy
"Blocked motor" (51)
The pump is blocked and
cannot start.
Try to remove deposits by lightly tapping on cast iron pump housing.
Alternatively, shut off the pump on the medium side, remove the
pump head and remove deposits (such work must only be
performed by a specialist company).
"Internal fault" (72, 76, 85)
Internal fault.
Replace the pump and dispose in an environmentally sound way
according to local regulations, or contact Grundfos Service.
"Dry running" (57)
Water is missing in the
system or the system
pressure is too low.
Prime and vent the pump before a new startup.
"Overvoltage" (74)
The supply voltage to the
pump is too high.
Make sure that the power supply is within the specified range.
"Undervoltage" (40, 75)
The supply voltage to the
pump is too low.
Make sure that the power supply is within the specified range.
Warnings
Fault
Remedy
"Turbine operation" (43)
Other pumps or sources flow
through the pump even if the
pump is stopped ad switched
off.
Switch off the pump at the main switch. If the light in the pump
display is on, the pump is running in forced pumping mode.
Check the system for defective non-return valves and replace the
valves if necessary.
Check the system for correct position of non-return valves.
"Internal fault" (84)
Internal fault.
Replace the pump and dispose in an environmentally sound way
according to local regulations, or contact Grundfos Service.
"Real-time clock out of order"
(157)
Internal fault.
Normal pump operation is not affected, but the fault might have an
impact on scheduled operation. Replace the pump and dispose in
an environmentally sound way according to local regulations, or
contact Grundfos Service.
Pump operating status
Fault
Remedy
Not operating
A fuse in the installation is
blown.
Replace the fuse.
The current-operated or
voltage-operated circuit
breaker has tripped.
Cut in the circuit breaker.
The pump is defective.
Contact Grundfos Service or replace the pump.
Noise in the system
There is air in the system.
Vent the system.
The flow rate is too high.
Reduce the suction head.
Noise in the pump
There is air in the pump.
Let the pump run. The pump vents itself over time. Alternatively,
vent the pump via Grundfos GO Remote. See section
The inlet pressure is too low.
Increase the inlet pressure, or make sure that the air volume in the
expansion tank is sufficient, if installed.
Insufficient heat
The pump performance is too
low.
Increase the suction head.
