English (GB)
21
12.3 Fault finding chart
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
Fault
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Cause
Remedy
1.
The pump is
not running.
-
-
a)
Power supply failure.
Switch on the power supply.
Check the cables and cable
connections for defects and
loose connections and check
for blown fuses in the electrical
installation.
Yes
b)
The power supply is out
of prescribed voltage
range.
Check the power supply and the
pump nameplate. Reestablish
the power supply within the
prescribed voltage range.
No
c)
The shaft seal has
seized up.
.
No
d)
The pump is blocked by
impurities.
.
Contact Grundfos Service if the
problem persists.
Yes
e)
Dry running.
Check the water source, and
prime the pump.
No
f)
The maximum runtime
has been exceeded.
Check the installation for
leakage and reset the alarm.
No
g)
The internal non-return
valve is defective or
blocked in completely or
partly open position.
Clean, repair or replace the
non-return valve. See section
.
2.
The pump is
running.
-
a)
Leakage from the pipe
system, or the non-return
valve is not properly
closed due to impurities.
Check and repair the pipe
system, or clean, repair or
replace the non-return valve.
-
b)
Small continuous
consumption.
Check the taps and reconsider
the usage pattern (ice
machines, water evaporators
for air-conditioning, etc.).
-
c)
The temperature of the
pump and water is below
3 °C.
Consider protecting the pump
and the installation against
frost.
