Wilo -SiFire FIRST Installation And Operating Instructions Manual page 77

FAULT
The starter motor pinion does not
retract after starting the motor
The pump does not deliver water or
has a very low flow rate or delivery
head
The motor does not reach the rated
speed or it is oscillating
Abnormal heating - high water/oil
temperature
Sudden loss of speed
Black smoke
Abnormal mechanical noise
Installation and operating instructions Wilo-SiFire FIRST
Faults, causes and remedies
CAUSE
Temperature too low
Battery/starter motor/servo relay con-
nections loose or corroded
Motor pump switchgear failure on
switchgear
Starter motor failure
Switchgear failure on the control
panel.
Suction depth too high. Pump cavita-
tion
Unsuitable diameter suction pipe and
valves. Pump cavitation
Air entering the suction line
Partially/totally closed shut-off valves Open the suction and discharge valves
Worn pump
Pump impeller blocked
Suction strainer/clogged filters
Worn pump and motor joint
Motor does not reach rated speed or
pendulum speed
Throttle lever in wrong position
Clogged fuel filter
Faulty injector/pump
Overload for partially blocked pump
Non-axis joint
Throttle lever in wrong position
Ambient temperature higher than
40 °C
Insufficient ventilation
Dirty or clogged radiator/ intercooler
Lack of water in the radiator/ex-
changer
Heat exchanger circuit valve closed or
insufficiently open
Circulator failure
Fan belt failure (for air-cooled motors) Check voltage and replace if necessary
Malfunction of the relevant alarm
Instantaneous overload/foreign body
in the pump
Air filter clogged/dirt filter
Oil level too high
Injector failure, fuel pump, etc.
Loose bolts
Loose joint cover screws
Creep between fan and guards,
between joint and joint cover, etc.
REMEDIES
Check that the ambient temperature is not below 10 °C.
Check that the oil/water heater is working properly. Re-
place.
Check cables and terminals. Rewire. Tighten well. Re-
place.
Check and replace if necessary
Contact customer service
Contact customer service
Review calculations based on NPSHr value from pump
Review calculations based on NPSHr value from pump
Check that there are no leakages in the suction line.
Check the distance between the suction units. If more
than one pump is installed, install anti-vortex plates
Check and repair
Check and repair
Check and repair
Check and repair
Check the rpm on the display of the switchgear. See next
item
Check, adjust the speed and secure the lever
Replace
Contact customer service
Dismantle and check
Align correctly
Check, adjust the speed and secure the lever
Conditioning the environment
Check filters and ducts, clean or resize
Dismantle and clean
After cooling, top up the water and check for leaks
Check that the pump is delivering water and open the
valve
Contact customer service
Check probe, connections and switchgear. Replace if ne-
cessary
Stop the motor, disassemble the pump and repair
Replace
Eliminate excess oil
Contact customer service
Check and tighten
Check and tighten
Ensure correct distance and reassemble
en
77