14.3 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
Grundfos Eye
Indicator light
Automatic reset
Cause Remedy
The pump is not
running.
- - 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 in-
stallation.
Yes
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 The shaft seal has seized up.
See section Starting up the product after
standstill.
No The pump is blocked by impurities.
See section Starting up the product after
standstill.
Contact Grundfos Service if the problem
persists.
Yes Dry running.
Check the water source, and prime the
pump.
No
The maximum runtime has been ex-
ceeded.
Check the installation for leakage and re-
set the alarm.
No
The internal non-return valve is defec-
tive or blocked in completely or partly
open position.
Clean, repair or replace the non-return
valve. See section Servicing the product.
The pump is run-
ning.
-
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.
- Small continuous consumption.
Check the taps and reconsider the usage
pattern (ice machines, water evaporators
for air-conditioning, etc.).
-
The temperature of the pump and wa-
ter is below 3 °C.
Consider protecting the pump and the in-
stallation against frost.
The pump per-
formance is insuf-
ficient.
-
- The pump inlet pressure is too low. Check the inlet conditions of the pump.
- The pump is undersized. Replace the pump with a bigger pump.
- -
The inlet pipe, the inlet strainer or the
pump is partly blocked by impurities.
Clean the inlet pipe or the pump.
- - There is a leakage in the inlet pipe. Repair the inlet pipe.
- -
There is air in the inlet pipe or the
pump.
Prime the inlet pipe and the pump.
Check the inlet conditions of the pump.
- -
The required outlet pressure is too low
for the installation.
Increase the pressure setting (arrow up).
Yes
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.
22
English (GB)
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