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3.6 Fault finding using alarm and warning codes
Apart from being indicated by the indicator lights on the control panel, alarms, warnings and their fault codes can be
read using the R100.
3.6.1 Alarm and warning list
The list below gives you an overview of the possible alarms and warnings and a description of their causes and
suggestions for remedy.
These abbreviations are used in the column "Fault type":
W: Warning.
A: Alarm.
1): The alarm can be configured to Warn/Max/Min/Stop/User using the PC Tool E-products.
Fault code Fault reading in the R100
Fault reading in PC Tool E-products
Fault type
Explanation/cause
Remedy
3
External fault
External fault signal
A
The digital input set for "External fault" was or is
closed (terminal 1, 10 or 11).
When the digital input is no longer closed, the fault indication can be reset
either with the R100 or by pressing or .
4
Too many restarts
Too many restarts (from standby mode per 24 hours)
A
• The number of attempted restarts at 10-second
intervals after a fault has exceeded four within
one minute.
• The number of attempted restarts at five-minute
intervals after a fault has exceeded 16 within
24 hours.
Seek the cause under the fault log code numbers in the R100.
The pump will automatically attempt to restart after 24 hours.
The fault indication can be reset either with the R100 or by
pressing
or .
30
Replace motor bearings
Motor bearings need change (service information)
W
The motor has reached the number of operating hours
for the bearing service life that is stated in the
configuration.
Replace the bearings. See section
4.2 Replacement of motor bearings
.
31
Replace varistor
Motor varistor(s) need change (service information)
W
The varistor has been exposed to the allowable
number of transients and needs replacing.
Contact Grundfos Service.
32
Overvoltage
Overvoltage
A
The supply voltage has been or is too high.
Reduce the voltage to the specified level (see the nameplate).
40
Undervoltage
Undervoltage
A
The supply voltage has been or is too low.
Increase the voltage to the specified level (see the nameplate).
41
Undervoltage
Undervoltage transient
A
There has been a voltage drop in the supply voltage
caused by one of the following:
• Supply cable too small.
• Another big user is supplied from the same
panel.
45
Mains voltage asymmetry
Voltage asymmetry
A
The supply voltage has been or is asymmetric.
Check the supply voltage while the motor is loaded.
49
Overload
Overcurrent (i_line, i_dc, i_mo)
A
The terminal box or the motor is heavily overloaded.
Cause:
• Blocked pump.
• Remove the blockage.
• Blocked rotor.
• Remove the blockage.
• Continued overload.
• Reduce the load.
• Incorrect configuration of the terminal box.
• Contact Grundfos Service.
• Wrong terminal box.
• Contact Grundfos Service.
• Fault in stator windings.
• Contact Grundfos Service.
• Power supply failure (phase failure).
• Re-establish correct power supply.
51
Overload
Blocked motor/pump
A
The pump is blocked during start-up which causes
a heavy overload. The input current is very high;
the motor P > 120 % for 60 seconds.
Remove the blockage.
