Product Manual

English (GB)
12
12.3 Fault finding chart
Warning
Before starting fault finding, switch off the power
supply.
Make sure that the power supply cannot be
accidentally switched on.
Fault
Grundfos Eye Indicator light Automatic reset
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 9. Starting up the product
after shutdown or standstill.
No
d) The pump is blocked by impurities See section 9. Starting up the product
after shutdown or 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
10. Servicing the product.
2. The pump is
running.
-
a) Leakage from the pipework, or
the non-return valve is not
properly closed due to impurities
Check and repair the pipework, 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 is below freezing
point
Consider protecting the pump and the
installation against frost.
3. 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) Leakage in the inlet pipe
Repair the inlet pipe.
--
e) 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.