Fault Finding Chart - Grundfos MAGNA Installation And Operating Instructions Manual

8. Fault finding chart

Before starting any work on the module, make sure that
the electricity supply to the pump and the module has
been switched off and that it cannot be accidentally
switched on.
Fault
The pump does
not react to
external start/
stop.
The pump does
not send the
correct signal
from the signal
relay.
14
Cause
The wires are not
connected correctly to
the terminal block.
The pump was stopped
on the control panel or
with the R100.
Relay module not
mounted correctly.
Relay module defective.
Control box defective.
The wires are not
connected correctly to
the terminal block.
Signal relay not
configured correctly.
Relay module not
mounted correctly.
Relay module defective.
Control box defective.
Remedy
Connect the wires
correctly.
Set the pump back to
normal duty.
Mount the relay module
correctly.
Replace the relay
module.
Replace the control box.
Connect the wires
correctly.
Configure the signal
relay correctly.
The R100 can be used.
Mount the relay module
correctly.
Replace the relay
module.
Replace the control box.