Wilo Isar BOOST5, Installation And Operating Instructions Manual, Page: 20 / 24

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20 Installation and operating instructions • Wilo-Isar BOOST5 • Ed.03/12/2022
Continuous green LED + flashing red LED
Example Pump in alarm state due to short-circuit
LED 1 cont flashing red LED =
short-circuit
9 Maintenance
Inspection and cleaning of non-return valve (Fig. 8)
• After lowering the system pressure, unscrew and remove the filler screw.
• Remove the non-return valve unit by unscrewing the fastening screw.
• Inspect and clean it.
• Reinstall the non-return valve unit. Make sure it is oriented correctly.
• Screw the filler screw back on properly.
Inspection and cleaning of non-return valve (Fig. 9)
• Lower the system pressure.
• Remove the cover and fork.
• Remove the bent connection.
• Extract the non-return valve.
• Check and clean it.
• Replace the non-return valve in its housing correctly.
• Reattach the bent connection, as well as the cover and fork.
10 Faults, causes and remedies
WARNING
Risk of electric shock
Danger from electrical current must be eliminated. Ensure that the
pump’s power supply is switched off and secured against unauthorised
reactivation before performing any electrical work.
Fault LED signal Remedy
The control panel does not light up LEDs turned off Check that the side switch is set to “I”.
Check the presence of mains power supply and conformity of the
residual-current device.
Pump does not start Red LED continuously lit Switch on the pump by pressing the “I/O” button.
Flashing red LED See the list of alarm codes in Section 8
Green LED continuously lit System pressure does not fall below the set working pressure.
Low water alarm Flashing red LED, flashing green
LEDs in position 1 Check for water at the suction side.
Ensure the suction is not obstructed.
Fill and prime the pump.
Short-circuit alarm Flashing red LED, continuous green
LEDs in position 1. Check the pump is not blocked by opening the plug at the back
of the motor and turning the shaft
Check that the cable, plug and socket are intact and there are no
leakages
Low voltage alarm Flashing red LED, flashing green
LEDs in position 5. Voltage is more than 15 % lower than value indicated on signal
plate. Stabilise voltage to keep it within the limits ±15%.