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Installation and operating instructions • Wilo-Isar BOOST5 • Ed.03/12/2022 19
NOTICE
The priming process lasts no longer than 5minutes. At the end of each
minute, Wilo-Isar BOOST5 stops the electric pump automatically for
5seconds, then restarts it. And so on until Wilo-Isar BOOST5 is primed.
During this process, the LEDs will continue to flash. The priming stage
may be brought to a close by timeout (5minutes) or the end of the prim-
ing stage. The LEDs will stop flashing. If the pump does not prime itself,
repeat the operation.
8.2 Alarm codes
Flashing green LED + flashing red LED
Alarm 1 Low water. Starts after 7seconds of no wa-
ter at the suction side. Check for water at
the suction side and fill the pump. Wilo-Isar
BOOST5 attempts automatic restart after
1min, 15min, 30min, 1h, etc.
Alarm 2 The pump does not reach the set pressure.
Contact customer service.
Alarm 3 The tank’s preload pressure is too low; in-
flate the tank to 50% of working pressure
(for instance, if working pressure is 3bar, in-
flate the tank to 1.5bar).
Alarm 4 Discharge pressure below 0.2bar (broken
pipe). Reset possible in manual mode only.
Check why the pressure was reset to zero.
Alarm 5 Supply voltage too low. Ensure 230V ±10%
of power supply.
Alarm 6 OFF signal from exterior.
Example
Pump in alarm state due to low water
LED 1 flashing + red LED flashing = low wa-
ter
Continuous green LED + flashing red LED
Alarm 1 Short-circuit. Turn off the device and con-
tact customer service. Reset possible in
manual mode only.
Alarm 2 Excess current. The current absorbed ex-
ceeds the authorised tolerance. Reset pos-
sible in manual mode only. Contact customer
service if the problem persists.
Alarm 3 Excessive module temperature. Check the
temperature of the fluid being pumped. If
the fluid temperature is not above 40°C,
contact customer service. Automatic reset if
the temperature falls below the alarm level.
Alarm 4 Excessive motor temperature. Check the
temperature of the fluid being pumped. If
the fluid temperature is not above 40°C,
contact a support centre. Automatic reset if
the temperature falls below the alarm level.
Alarm 5 Invalid pressure sensor signal. Contact cus-
tomer service.
Alarm 6 Invalid volume flow sensor signal. Contact
customer service.