12.7 TEMP
•
The red LED is flashing.
•
The buzzer and the alarm symbol are on.
•
The temperature symbol is flashing.
•
The symbol of the pump is flashing.
•
The faulty pump stops, and the other pump starts.
•
Display text:
TEMP
.
The pump has started too many times and is overheated. The thermal switch has stopped the
pump.
Cause
Remedy
Leakage or incorrect sizing of
the lifting station.
1. Check the non-return valve for any leakage.
2. If there is no leakage, check the inflow parameters.
The inflow must not be higher than the pump performance.
If the inflow is too high, contact the nearest Grundfos sales
company or reduce the inflow.
3. Allow the pump to cool. The pump restarts automatically.
12.8 SENSOR
•
The red LED is flashing.
•
The buzzer and the alarm symbol are on.
•
Display text:
SENSOR
.
The alarm indicates that the sensor signal is out of range. Go to the information menu
F_01
.
1. If the fault code
F003
appears on top of the list, there is a high-level alarm. The inflow is
higher than the outflow, and the liquid level is above the sensor measuring range of 1000
mm. The pumps have been started. Go to solution 1.
2. If
F003
is not one of the latest faults, the sensor type could have accidentally been changed
via the display or Grundfos PC Tool. Go to solution 2.
3. If the problem is still not solved, contact the nearest Grundfos sales company.
Solution 1
Cause
Remedy
Not all outlet valves are
open.
Open all outlet valves.
There is a blockage in the
tank or pump.
Remove the blockage.
The pump is not vented cor-
rectly. The pump cannot
build up pressure.
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.
The lifting station is under-
sized.
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.
Solution 2
Cause
Remedy
The sensor type has accidentally
been changed.
Reset the controller to the factory settings in the settings
menu
G_01
.
Related information
• 3.2.2.1 Installing the pumps
Multilift MD1, MDV | Fault finding the product|
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