English (GB)
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10. Grundfos alarm and warning codes
This is a complete list of alarm and warning codes for Grundfos
products. For the codes supported by this product, see the alarms
and warnings section.
Code Description Code Description Code Description
1 Leakage current 36 Outlet valve leakage 71
Motor temperature 2 (Pt100,
t_mo2)
2 Missing phase 37 Inlet valve leakage 72 Hardware fault, type 1
3 External fault signal 38 Vent valve defective 73 Hardware shutdown (HSD)
4 Too many restarts 39 Valve stuck or defective 74 Internal supply voltage too high
5 Regenerative braking 40 Undervoltage 75 Internal supply voltage too low
6 Mains fault 41 Undervoltage transient 76 Internal communication fault
7 Too many hardware shutdowns 42 Cut-in fault (dV/dt) 77
Communication fault, twin-head
pump
8 PWM switching frequency reduced 43 - 78 Fault, speed plug
9 Phase sequence reversal 44 - 79 Functional fault, add-on module
10 Communication fault, pump 45 Voltage asymmetry 80 Hardware fault, type 2
11 Water-in-oil fault (motor oil) 46 - 81 Verification error, data area (RAM)
12
Time for service (general service
information)
47 - 82
Verification error, code area (ROM,
FLASH)
13 Moisture alarm, analog 48 Overload 83
Verification error, FE parameter
area (EEPROM)
14
Electronic DC-link protection
activated (ERP)
49 Overcurrent (i_line, i_dc, i_mo) 84 Memory access error
15
Communication fault, main system
(SCADA)
50
Motor-protection function, general
shutdown (MPF)
85
Verification error, BE parameter
area (EEPROM)
16 Other 51 Blocked motor or pump 86 Fault (add-on) I/O module
17
Performance requirement cannot
be met
52 Motor slip high 87 -
18 Commanded alarm standby (trip) 53 Stalled motor 88 Sensor fault
19 Diaphragm break (dosing pump) 54
Motor-protection function, 3 sec.
limit
89 Signal fault, (feedback) sensor 1
20 Insulation resistance low 55
Motor current protection activated
(MCP)
90 Signal fault, speed sensor
21 Too many starts per hour 56 Underload 91 Signal fault, temperature sensor 1
22 Moisture switch alarm, digital 57 Dry running 92
Calibration fault, (feedback)
sensor
23 Smart trim gap alarm 58 Low flow 93 Signal fault, sensor 2
24 Vibration 59 No flow 94 Limit exceeded, sensor 1
25 Setup conflict 60 Low input power 95 Limit exceeded, sensor 2
26
Load continues even if the motor
has been switched off
61 - 96 Setpoint signal outside range
27
External motor protector activated
(for example MP 204)
62 - 97 Signal fault, setpoint input
28 Battery low 63 - 98
Signal fault, input for setpoint
influence
29
Turbine operation (impellers
forced backwards)
64 - 99
Signal fault, input for analog
setpoint
30
Change bearings (specific service
information)
65
Motor temperature 1 (t_m or t_mo
or t_mo1)
100
RTC time synchronisation with
cellular network occurred
31
Change varistor(s) (specific
service information)
66
Temperature, control electronics
(t_e)
101 -
32 Overvoltage 67
Temperature too high, internal
frequency converter module (t_m)
102 Dosing pump not ready
33
Soon time for service (general
service information)
68
External temperature or water
temperature (t_w)
103 Emergency stop
34 No priming water 69
Thermal relay 1 in motor, for
example Klixon
104 Software shutdown
35
Gas in pump head, de-aerating
problem
70
Thermal relay 2 in motor, for
example thermistor
105
Electronic rectifier protection
activated (ERP)
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