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24
8.3 Fault finding table
Warnings and alarm
codes
Fault
Automatic reset
and restart?
Corrective actions
"Pump communication
fault" (10)
"Alarm"
Communication fault between
different parts of the
electronics.
Yes
Replace the pump, or contact Grundfos Service.
Check if the pump is running in turbine operation. See code
(29) "Forced pumping".
"Forced pumping" (29)
"Alarm"
Other pumps or sources force
flow through the pump even if
the pump is stopped and
switched off.
Yes
Switch off the pump on the main switch. If the light in
Grundfos Eye 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,
etc.
"Undervoltage" (40, 75)
"Alarm"
The supply voltage to the
pump is too low.
Yes
Make sure that the power supply is within the specified
range.
"Blocked pump" (51)
"Alarm"
The pump is blocked. Yes
Dismantle the pump, and remove any foreign matter or
impurities preventing the pump from rotating. Check the
water quality to eliminate the risk of lime precipitation.
"High motor
temperature" (64)
"Alarm"
The temperature in the stator
windings is too high.
No Contact Grundfos Service, or replace the pump.
"Internal fault" (72 and
155)
"Alarm"
Internal fault in the pump
electronics.
Irregularities in the voltage
supply can cause alarm 72.
Yes
There might be turbine flow in the application that forces a
flow through the pump.
Contact Grundfos Service, or replace the pump.
"Overvoltage" (74)
"Alarm"
The supply voltage to the
pump is too high.
Yes
Make sure that the power supply is within the specified
range.
"Communication fault,
twin-head pump" (77)
"Warning"
The communication between
pump heads was disturbed or
broken.
-
Make sure that the second pump head is powered on or
connected to the power supply.
"Internal fault" (84 and
85)
"Warning"
Fault in the pump electronics. - Contact Grundfos Service, or replace the pump.
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