Xylem MIDIBOX SINGLEBOX PLUS DOUBLEBOX PLUS - Manual (Page 22)

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8. Troubleshooting Troubleshooting Troubleshooting Troubleshooting Information for users and maintenance personnel Information for users and maintenance personnel Information for users and maintenance personnel Information for users and maintenance personnel
Follow the instructions in the operating manuals of the electric pump and of the electric panel, where
applicable.
For further information, consult section 7.
PROBLEM PROBLEM PROBLEM PROBLEM PROBABLE CAUSE PROBABLE CAUSE PROBABLE CAUSE PROBABLE CAUSE POSSIBLE SOLUTION POSSIBLE SOLUTION POSSIBLE SOLUTION POSSIBLE SOLUTION
No power supply Restore the power supply.
Triggering of electric pump thermal
protector Wait for the electric pump motor to cool.
Triggering of thermal relay or motor
protector found in the electric control
panel Reset the thermal protector.
Pump or auxiliary circuits protection fuses
blown Replace fuses.
The electric pump does not start.
The main switch is on
Problems on the external control device
(float switch) Check the device and the relative
connection cables.
Electric motor short circuit Check the operating conditions of the
electric pump and reset the protection.
Power supply cable is damaged
The electric pump starts up but the
thermal protector is immediately triggered
or the fuses blow
Thermal protector or fuses not suited to
the motor current
Check the components and replace as
necessary.
A phase in the power supply is missing Check the power supply
Power supply voltage not within the
motor’s working limits Check the operating conditions of the
electric pump.
The electric pump starts up but, after a
short period of time, the thermal
protector is triggered or the fuses blow
The electric panel is situated in an
excessively heated area or is exposed to
direct sunlight Protect the panel from heat sources and
from the sun.
Incoming liquid too hot Check the operating conditions of the
electric pump.
Excessively large solids have clogged the
impeller
The electric pump starts up but, after a
varying period of time, the thermal
protector is triggered.
Filaments have blocked the impeller (for
versions that do not feature a “vortex”
type impeller)
Remove the electric pump and clean it. If
the problem persists, check the operating
conditions of the electric pump.
Leaks in check valve or system Check and locate leaks. Repair or replace
the components. The pump starts up too frequently
Float switch incorrectly adjusted Check the float switch.
Incorrect direction of rotation Check the direction of rotation and, if
necessary, exchange two phases in the
motor or electrical panel if three-phase or
check all the connections if single-phase.
Delivery pipe blocked or the check valve is
dirty or there is an air pocket Check the installation.
The electric pump starts up but does not
deliver the required flow
Electric pump is damaged or its internal
parts are clogged Consult the relative instructions in the
pump manual.
The system’s general protection cuts in. Short circuit Check the electrical system
The system’s differential thermal-magnetic
protection cuts in. Ground leakage Check insulation of the electrical system
components.
9. Disposal Disposal Disposal Disposal Information for installation and maintenance personnel Information for installation and maintenance personnel Information for installation and maintenance personnel Information for installation and maintenance personnel
Observe the regulations and codes locally in force regarding sorted waste disposal. If possible, reutilise the
packaging for other purposes.
10. Warranty Warranty Warranty Warranty
Please refer to the sales contract for further information.