Grundfos SCALA Series, Installation And Operating Instructions Manual

Page: 14 / 18

English (GB)
14
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
G
rundfos Ey
e
Indica
tor l
ight
Automatic res
e
t
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. See section 10. Starting up the product
after standstill .
No
d) The pump is blocked by
impurities.
See section 10. Starting up the product
after standstill .
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
9. Servicing the
product .
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.
3. The pump
performance is
insufficient.
- -
a) The pump inlet pressure is too
low.
Check the inlet conditions of the pump.
-
b) The pump is undersized.
Replace the pump with a bigger pump.
- -
c) The inlet pipe, the inlet strainer or
the pump is partly blocked by
impurities. Clean the inlet pipe or the pump.
- -
d) There is a leakage in the inlet
pipe.
Repair the inlet pipe.
- -
e) There is air in the inlet pipe or the
pump.
Prime the inlet pipe and the pump.
Check the inlet conditions of the pump.
- -
f) The required outlet pressure is
too low for the installation.
Increase the pressure setting (arrow up).
Yes
g) The maximum temperature has
been exceeded and the pump is
running at reduced performance.
Check the cooling conditions. Protect
the pump against direct sunlight or any
nearby heat sources.