The Pump Starts And Stops Too Frequently; The Pump Does Not Stop; Insufficient Pump Performance - Grundfos SCALA1 System Instructions Manual

6.5 The pump starts and stops too
frequently
Grundfos Eye:
Two opposite green
indicator lights are
rotating.
Cause
Leakage in the inlet pipe
or air in the water.
A tap has not been
closed entirely after use.
Minor leakage in the
system.
Related information
5.5 Anti-cycling

6.6 The pump does not stop

Grundfos Eye:
Two opposite green
indicator lights are
rotating.
Cause
The pump cannot
deliver the necessary
discharge pressure.
The existing pipes are
leaking or defective.
The non-return valve is
blocked or missing.
Remedy
• Restore the water
supply or repair the
inlet pipe.
• Check that all taps
have been closed.
• Check the system for
leakages.
Remedy
• Replace the pump.
• Repair the pipes.
• Clean the valve or fit a
non-return valve.

6.7 Insufficient pump performance

Grundfos Eye:
Two opposite green
indicator lights are
rotating.
Cause
The pump inlet pressure
is too low.
The pump is
undersized.
Inlet pipe, inlet strainer
or pump are partially
blocked by impurities.
Leakage in the inlet
pipe.
Air in the inlet pipe or
the pump.
Remedy
• Check the pump inlet
conditions.
• Replace the pump with
a larger pump.
• Clean the inlet pipe or
the pump.
• Repair the inlet pipe.
• Prime the inlet pipe
and the pump. Check
the pump inlet
conditions.
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