Faults, causes and remedies
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Installation and operating instructions Wilo-SiFire FIRST
77
FAULT
CAUSE
REMEDIES
Temperature too low
Check that the ambient temperature is not below 10 °C.
Check that the oil/water heater is working properly. Re-
place.
Battery/starter motor/servo relay con-
nections loose or corroded
Check cables and terminals. Rewire. Tighten well. Re-
place.
Motor pump switchgear failure on
switchgear
Check and replace if necessary
Starter motor failure
Contact customer service
The starter motor pinion does not
retract after starting the motor
Switchgear failure on the control
panel.
Contact customer service
The pump does not deliver water or
has a very low flow rate or delivery
head
Suction depth too high. Pump cavita-
tion
Review calculations based on NPSHr value from pump
Unsuitable diameter suction pipe and
valves. Pump cavitation
Review calculations based on NPSHr value from pump
Air entering the suction line
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
Partially/totally closed shut-off valves Open the suction and discharge valves
Worn pump
Check and repair
Pump impeller blocked
Check and repair
Suction strainer/clogged filters
Check and repair
Worn pump and motor joint
Check and repair
Motor does not reach rated speed or
pendulum speed
Check the rpm on the display of the switchgear. See next
item
The motor does not reach the rated
speed or it is oscillating
Throttle lever in wrong position
Check, adjust the speed and secure the lever
Clogged fuel filter
Replace
Faulty injector/pump
Contact customer service
Overload for partially blocked pump
Dismantle and check
Non-axis joint
Align correctly
Throttle lever in wrong position
Check, adjust the speed and secure the lever
Abnormal heating - high water/oil
temperature
Ambient temperature higher than
40 °C
Conditioning the environment
Insufficient ventilation
Check filters and ducts, clean or resize
Dirty or clogged radiator/ intercooler
Dismantle and clean
Lack of water in the radiator/ex-
changer
After cooling, top up the water and check for leaks
Heat exchanger circuit valve closed or
insufficiently open
Check that the pump is delivering water and open the
valve
Circulator failure
Contact customer service
Fan belt failure (for air-cooled motors) Check voltage and replace if necessary
Malfunction of the relevant alarm
Check probe, connections and switchgear. Replace if ne-
cessary
Sudden loss of speed
Instantaneous overload/foreign body
in the pump
Stop the motor, disassemble the pump and repair
Air filter clogged/dirt filter
Replace
Black smoke
Oil level too high
Eliminate excess oil
Injector failure, fuel pump, etc.
Contact customer service
Loose bolts
Check and tighten
Loose joint cover screws
Check and tighten
Abnormal mechanical noise
Creep between fan and guards,
between joint and joint cover, etc.
Ensure correct distance and reassemble