Faults, Causes And Remedies - Xylem LOWARA ResiBoost MMW Manuel D'installation, D'utilisation Et D'entretien

pected startup. Failure to do so could
result in death or serious injury.
• Wait a minimum of two minutes be-
fore opening the converter.
9.1 Faults, causes, and remedies
The pump does not run, the main switch is on
and none of the LEDs are illuminated
Cause Solution
No power supply Restore the power supply and
check that the mains connection
is intact.
Triggered over- Reset the overload circuit break-
load circuit er.
breaker
Triggered ground Reset the differential protection.
fault protective
device or circuit
breaker
Main fuse of the Replace the fuse.
converter blown
In the case of Replace the condenser if it is an
single-phase external one. Contact the local
pumps, the motor sales and service representative
condenser is if it is an internal condenser.
faulty.
Triggered ground • Reset the differential protec-
fault protective tion.
device • Replace the differential pro-
tection AC type with A or B
type.
• Install a differential protection
exclusive line converter sup-
ply immediately upstream of
the main electricity supplier.
The pump starts up but blows the converter fuse
Cause
Damaged power cable, the mo-
tor short circuits, or thermal pro-
tector or fuses are not suited for
the motor current.
Triggered thermal overload
switches on single-phase motors
or protective device on three-
phase motors, due to excessive
current input.
Missing a phase in the power
supply.
The utilities are closed and the electric pump
runs at intermittent speeds
Cause
Water leaking out of the non-
return valve or out of the sys-
tem.
Solution
Check and re-
place the compo-
nents as neces-
sary.
Check the oper-
ating conditions
of the pump.
Correct the pow-
er supply.
Solution
Check the system
to locate the leaks.
Repair or replace
the components.
Cause
Diaphragm tank with broken di-
aphragm, when applicable.
Operating point is not calibrat-
ed correctly in relation to the
system. For example, value is
higher that the pressure sup-
plied by the pump.
Operating point is not calibrat-
ed correctly in relation to the
system. Value at zero.
The utilities are open and the pump does not
start
Cause
Operating point is not calibrat-
ed correctly in relation to the
system. Value at zero.
The pump runs and there are vibrations in or
near the pump.
Cause
Operating point is not calibrated
correctly in relation to the system.
Value is below the minimum pres-
sure that is supplied by the pump.
The pump runs but starts and stops frequently
Cause
There could be a problem
with the level float in the in-
take tank.
There could be a problem
with the pressure switch on
the intake tank.
The pump always runs at maximum speed
Cause Solution
There could be a Check the hydraulic connec-
problem with the tion between the transmitter
pressure transmitter. and the system.
Check the working order of
the sensor.
There is air in the sensor or
the hydraulic circuit con-
cerned.
The set point is too Change the set point.
high and the pump
doesn't achieve the
pressure desired.
The pump is not Control the suction condition
primed. of pump.
en - Original instructions
Solution
Replace the dia-
phragm.
Recalibrate the set
point of the con-
verter.
Recalibrate the set
point of the con-
verter.
Solution
Recalibrate the set
point of the con-
verter.
Solution
Recalibrate the
set point of the
converter.
Solution
Check the float and
the tank.
Check the pressure
switch and the intake
conditions (pres-
sure).
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