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17
* See service instructions on www.grundfos.com >
Product Center.
8. System without
pressure tank:
The red "Alarm"
indicator light
flashes once.
a) Cycling.
A tap has not been closed
entirely after use.
Check that all taps have been closed.
See section 11.2 Anti cycling.
b) Cycling.
There is a minor leakage in the
system.
Check the system for leakages and stop
them.
See section 11.2 Anti cycling.
9. System with
pressure tank:
The red "Alarm"
indicator light
flashes once.
a) Cycling.
The pressure tank has no
precharge pressure, or the tank
size is insufficient.
Check the tank precharge pressure, and
recharge the tank, if necessary.
If the size of the pressure tank is insufficient,
set DIP switch 5 to "OFF", or replace the
pressure tank.
See section 11.2 Anti cycling.
10. The red "Alarm"
indicator light
flashes twice.
a) Maximum continuous operating
time, 30 minutes.
The pump has been running
continuously for 30 minutes.
Check the system for leakages and stop
them.
Disable the function to allow the pump to run
for 30 minutes.
See section 11.3 Maximum continuous
operating time, 30 minutes.
11. The red "Alarm"
indicator light
flashes three
times, and each
pump start is
delayed for a
few seconds.
a) Too many start-stop sequences
within a short period.
The pressure tank has no
precharge pressure, or the tank
size is insufficient.
Check the tank precharge pressure, and
recharge the tank, if necessary.
If the size of the pressure tank is insufficient,
set DIP switch 5 to "OFF", or replace the
pressure tank.
b) Too many start-stop sequences
within a short period.
PM 2 is set to start and stop with
1 bar differential pressure, i.e.
DIP switch 5 is set to "ON", but
no pressure tank has been
installed in the system.
Set DIP switch 5 to "OFF".
12. The red "Alarm"
indicator light
flashes four
times.
a) Pressure sensor fault.
Repair or replace the pressure manager.*
Fault Cause Remedy
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