Can the pump be started
Yes
a) Fault in the level equipment (start sensors).
manually?
Clean or replace.
b) Fault in control equipment.
No
Check:
- that all connections are intact.
- relay and contractor coils.
- that the control switch “Man/Auto” makes
contact in both positions.
Is the installation
No
Check:
receiving voltage?
- that the main power switch is on.
- that there is control voltage to the starter
Yes
equipment and its fuses are intact.
- that there is voltage in each phase of the
supply line.
- that all the fuses have continuity and are tight.
Is the start relay or the
Yes
Replace.
start capacitor defective?
(only for 1-phase motor)
No
Is the impeller stuck?
Yes
Clean.
WARNING: disconnect
Clean the sump.
power before checking
the impeller
No
Contact service shop.
2. Pump starts but motor protection trips
Is motor protection
Yes
Adjust.
set too low?
(Check with data plate)
No
Is the impeller difficult
Yes
Clean the impeller.
to rotate by hand?
Clean out the sump.
WARNING: disconnect
Check that the impeller is not adjusted
power before checking
too tight.
the impeller
If anything else is wrong, contact service shop.
No
Is the installation receiving
No
Check the motor fuses.
full voltage on all three
Notify an electrician.
phases?
Yes
