Cetetherm AquaEfficiency
Installation, service and operating instruction
76
Warning 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 call GRUNDFOS
SERVICE for assistance. 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 the Grundfos Eye is on, the
pump is running in forced-pumping mode.
Check the system for defective non-return
valves and replace, if necessary. Check
the system for correct position of non-
return valves, etc.
Undervoltage (40, 75)
Alarm
Supply voltage to the
pump too low.
Yes
Check that the power supply is within the
specified range.
Blocked pump (51)
Alarm
The pump is blocked.
No
Dismantle the pump, and remove any
foreign matter or impurities preventing the
pump from rotating.
Dry running (57)
Alarm
No water at the pump
inlet or the water
contains too much air.
No
Prime and vent the pump before a new
startup. Check that the pump is operating
correctly. If not, replace the pump, or call
GRUNDFOS SERVICE for assistance.
High motor
temperature (64)
Alarm
Temperature in stator
windings too high.
No
Check the winding resistance.
Internal fault (72, 84,
155, 157)
Warning/alarm
Internal fault in the
pump electronics.
Yes
Replace the pump, or call GRUNDFOS
SERVICE for assistance
Overvoltage (74)
Alarm
Supply voltage to the
pump too high.
Yes
Check that the power supply is within the
specified range.
Communication fault,
twin-headpump (77)
Warning
Communication
between pump heads
disturbed or broken.
Yes
Check that the second pump head is
powered or connected to the power
supply.
Internal sensor fault
(88)
Warning
The pump is receiving a
signal from the internal
sensor which is outside
the normal range.
Yes
Check that the plug and cable are
connected correctly in the sensor. The
sensor is located on the back of the pump
housing. Replace the sensor or call
GRUNDFOS SERVICE for assistance.
External sensor fault
(93)
Warning
The pump is receiving a
signal from the external
sensor which is outside
the normal range.
yes
Does the electrical signal set (0-10 V or 4-
20 mA) match the sensor output signal? If
not, change the setting of the analog input,
or replace the sensor with one that
matches the setup.
Check the sensor cable for damage.
Check the cable connection at the pump
and at the sensor. Correct the connection,
if required. See section 16.2 Sensor
condition. The sensor has been removed,
but the analog input has not been
disabled. Replace the sensor or call
GRUNDFOS SERVICE for assistance.
If the power supply cable is damaged, it must be replaced by the manufacturer, the manufacturer's service
partner or a similarly qualified person.
