Cause Remedy
The riser pipe is defective. Replace the riser pipe.
Undervoltage has occurred. Check the power supply.
11.4 Frequent starts and stops.
Cause Remedy
The differential of the pressure switch between the
start and stop pressures is too small.
Increase the differential. However, the stop pressure
must not exceed the operating pressure of the pressure
tank, and the start pressure should be high enough to
ensure sufficient water supply.
The water level electrodes or level switches in the
reservoir have not been installed correctly.
Adjust the intervals of the electrodes/level switches to
ensure suitable time between the cutting-in and cutting-
out of the pump. See installation and operating
instructions for the automatic devices used. If the
intervals between stop/start cannot be changed via the
automatics, the pump capacity may be reduced by
throttling the discharge valve.
The non-return valve is leaking or stuck half-open. Pull out the pump and clean/replace the non-return
valve.
The supply voltage is unstable. Check the power supply.
The motor temperature gets too high. Check the water temperature.
11.5 Megging
Do not meg an installation incorporating
this product as the built-in electronics may
be damaged.
TM071582
Megging
21
English (GB)
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