Grundfos SCALA1 System - Frequent Pump Cycling; Pump Does Not Stop; Insufficient Pump Performance

6.5 The pump starts and stops too
frequently
Grundfos Eye:
Two opposite green
indicator lights are
rotating.
Cause Remedy
Leakage in the inlet pipe
or air in the water.
• Restore the water
supply or repair the
inlet pipe.
A tap has not been
closed entirely after use.
• Check that all taps
have been closed.
Minor leakage in the
system.
• Check the system for
leakages.
Related information
5.5 Anti-cycling
6.6 The pump does not stop
Grundfos Eye:
Two opposite green
indicator lights are
rotating.
Cause Remedy
The pump cannot
deliver the necessary
discharge pressure.
• Replace the pump.
The existing pipes are
leaking or defective.
• Repair the pipes.
The non-return valve is
blocked or missing.
• Clean the valve or fit a
non-return valve.
6.7 Insufficient pump performance
Grundfos Eye:
Two opposite green
indicator lights are
rotating.
Cause Remedy
The pump inlet pressure
is too low.
• Check the pump inlet
conditions.
The pump is
undersized.
• Replace the pump with
a larger pump.
Inlet pipe, inlet strainer
or pump are partially
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 pump inlet
conditions.
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English (GB)