Grundfos MQ 3-45 - Pump Maintenance and Service

28.04.2003
GB
15 / 24
4.10 Fault finding overview
Start the pump and allow it to run for a minimum of 5 minutes with the tap turned on. Then observe how the
system reacts.
Typical faults
If the tap is opened
too quickly, there
will be no alarm
indication.
If the flow is lower
than 1.2 l/min., the
pump does not
start and there will
be no alarm indica-
tion.
See 4.10.1
Observation
A on page 16.
Water comes out of
the tap, but the
pump stops every
15 seconds for a
short period and
starts again right
away. The alarm
indicator light is off.
See 4.10.2
Observation
B on page 18.
No water comes
out of the tap. The
alarm indicator
light is on.
See 4.10.3
Observation
C on page 20.
No water comes
out of the tap. The
alarm indicator
light is off.
See 4.10.4
Observation
D on page 23.
Pressure
switch
Controller
15 sec.
Pressure
switch
Flow sensor Controller
Controller
Capacitor
Motor Hydraulics
Controller