8.2 The pump runs but gives no water.
Cause Remedy
The outlet valve is closed. Open the valve.
No water or too low water level in the tank. Increase the installation depth of the pump. Reduce the
pump performance, or replace the pump by a pump with
a lower performance.
The non-return valve is stuck in its closed position. Pull out the pump, and clean or replace the valve.
The inlet strainer is clogged. Pull out the pump, and clean the inlet strainer with a
brush and a water jet.
The pump is defective. Repair or replace the pump.
8.3 The pump runs at reduced performance.
Cause Remedy
The valves in the outlet pipe are partly closed or
blocked.
Check and clean or replace the valves.
The outlet pipe is partly blocked by impurities. Clean or replace the pipe.
The non-return valve in the outlet pipe is partly
blocked.
Clean or replace the valve.
The pump and outlet pipe are partly blocked by
impurities.
Pull out the pump. Check and clean or replace the
pump. Clean the pipes.
The inlet strainer is clogged. Clean the inlet strainer.
The pump is defective. Repair or replace the pump.
Leakage in the pipes. Check and repair the pipes.
The outlet pipe is defective. Replace the outlet pipe.
Undervoltage has occurred. Check the power supply.
15
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