F002; F003; F007, F008 - Grundfos Multilift MD1 Installation And Operating Instructions Manual

12.2 F002

Conditions:
• The red LED is flashing.
• The buzzer and the alarm symbol are on.
• Display text: F002.
• The symbol of the phase sequence is flashing.
Cause
Missing phase

12.3 F003

• The red LED is flashing.
• The buzzer and the alarm symbol are on.
• Display text: F003.
• The symbol of the high-level alarm is flashing.
• Both pumps are running.
This alarm indicates high liquid level in the tank. The inflow is higher than the outflow.
Cause
Not all outlet valves are open.
There is a blockage in the tank
or pump.
The pump is not vented cor-
rectly. The pump cannot build
up pressure.
The lifting station is under-
sized.
Related information
• 3.2.2.1 Installing the pumps

12.4 F007, F008

• The red LED is flashing.
• The buzzer and the alarm symbol are on.
• The symbol of the pump is flashing.
• The faulty pump stops, and the other pump starts.
• Display text: F007 or F008.
The controller has detected overcurrent and stopped the faulty pump.
Fault code
F007
F008
Remedy
Connect the missing phase.
Remedy
Open all outlet valves.
Remove the blockage.
1. Check that the vent flange is correctly fitted between the
pump outlet and the outlet valve.
2. Check that the vent hose is correctly fitted between the
vent flange and the tank.
3. Remove any blockage from the vent pipe or vent flange.
Recalculate the inflow parameters and compare the result with
the tank volume and pump performance. If you need a new
product, contact the nearest Grundfos sales company.
Cause
Pump 1 is blocked.
Missing phase, pump 1.
Pump 2 is blocked.
Missing phase, pump 2.
Multilift MD1, MDV | Fault finding the product| 39
Remedy
Remove the blockage.
1. Check the motor windings.
2. Connect the missing phase.
Remove the blockage.
1. Check the motor windings.
2. Connect the missing phase.