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11
7.3 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
1. 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 installation.
Yes
The power supply is out of the
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.
Remove the end cover plug and
deblock the shaft seal by turning the
shaft by means of a screwdriver.
No The pump is blocked by impurities.
Contact Grundfos Service if the
problem persists.
Yes Dry running.
Check the water source, and prime
the pump.
No
The maximum runtime has been
exceeded.
Check the installation for leakage and
reset the alarm.
No
The internal non-return valve is
defective or blocked in completely or
partly open position.
Clean, repair or replace the
non-return valve.
2. The pump is
running.
-
Leakage from the pipes, or the
non-return valve is not properly
closed due to impurities.
Check and repair the pipes, 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 is below the freezing
point.
Consider protecting the pump and the
installation against frost.
3. Pump performance
is insufficient.
- - 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.
- - Leakage in the inlet pipe. Repair the inlet pipe.
- - 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.
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