11.3 The motor-protective circuit breaker trips occasionally
Cause
Remedy
The motor-protective circuit breaker setting is too
low.
Set the motor-protective circuit breaker correctly.
Low voltage at peak times.
Ensure a stable power supply.
11.4 The motor-protective circuit breaker has not tripped, but the pump does not run
Cause
Remedy
Supply failure.
Connect the power supply.
The fuses are blown.
Replace the fuses.
The thermal protection has tripped.
Reactivate the thermal protection.
The main contacts in the motor-protective circuit
breaker are not making contact or the coil is
faulty.
Replace the contacts or the magnetic coil.
The control circuit is defective.
Repair the control circuit.
11.5 The pump performance is not constant
Cause
Remedy
The pump inlet pressure is too low (cavitation).
Check the inlet conditions.
The inlet pipe or pump is partly blocked by
impurities.
Clean the inlet pipe or pump.
The pump draws in air.
Check the inlet conditions.
11.6 The pump runs, but gives no water
Cause
Remedy
The inlet pipe or pump is blocked by impurities.
Clean the inlet pipe or pump.
The foot or check valve is blocked in closed
position.
Repair the foot or check valve.
There is a leakage in the inlet pipe.
Repair the inlet pipe.
There is air in the inlet pipe or pump.
Check the inlet conditions.
The motor runs in the wrong direction of rotation.
Change the direction of rotation of the motor.
11.7 The pump runs backwards when switched off
Cause
Remedy
There is a leakage in the inlet pipe.
Repair the inlet pipe.
The foot or check valve is defective.
Repair the foot or check valve.
11.8 Leakage in the shaft seal
Cause
Remedy
The shaft seal is defective.
Replace the shaft seal.
28
English (US)
