GRUNDFOS
INSTRUCTIONS
www.grundfos.co.uk
Page 31 of 35
The Digital outputs (D01/D02/D03) represent the following information:
Digital
Output
Fault detected
D01
Fault detected by the controller refer to the checklist above. LED coding will describe fault found.
D02
Low water low level device (level switch in breaktank) has been activated.
D03
Fire Alarm device (system flow switch) has been activated.
System operation problems can be diagnosed using the following checklist:
Fault
Possible cause(s)
Corrective Action(s)
Pump does not run when
“Test/Rest” button is pressed for
3 seconds
1)
No electrical supply to
Pump/
FireSAFE
control panel.
2)
Pump fuse blown.
3)
Controller fuse blown.
4)
Faulty Controller.
5)
Power wiring to
pump/controller.
A)
Check power LED ON on controller
front.
B)
Check Fault LED, refer to above coding
table.
C)
Check electrical supply to pump
D)
Contact your system supplier/Grundfos
Service for remedial action.
Pump does not reach the duty
point but continues to run.
1)
Not enough water getting to
the pump.
2)
Air trapped in pump and or
system.
3)
Small demand from system or
leak.
a)
Check suction isolating valve is fully
open.
b)
Bleed air from system and pump.
c)
Check system for demand/leak.
d)
Contact your system
supplier/Grundfos Service for
remedial action.
Pump does not reach the duty
point while running and shuts off.
1)
Pressure switch setting too
low
2)
Pressure switch fault.
3)
Wrong
FireSAFE
unit
specified/delivered
a)
Check settings of the pressure switch
are not too low.
b)
Replace pressure switch
c)
Check unit is suitable for duty point
required.
d)
Contact your system
supplier/Grundfos Service for
remedial action.
Pump delivers correct pressure,
but does not stop with no
demand.
1)
Pressure switch setting too
high
2)
Pressure switch fault.
3)
Demand from system/leak
4)
Pressure vessel settings (if
used)
a)
Check settings of the pressure switch
are not too high.
b)
Replace pressure switch.
c)
Inspect system.
d)
Check vessel pre-set pressure.
e)
Contact your system
supplier/Grundfos Service for
remedial action.
Pump does not run
1)
Pressure switch has been
disconnected from the PCB
a)
Check connections at pressure
switch ends and PCB
b)
Check wire for breaks
c)
Check Pressure switch plug in the
correct PCB socket
d)
Check pressure switch plug is
correctly seated in PCB socket
Pump does not start
Alarm! LED ON
Buzzer ON
1)
Pressure switch and Flow
switch plugs in wrong sockets
a)
Refit plugs in correct sockets see
wiring diagram
Fire Mode engaged, pump on but
no sprinkler head activated
1)
Leak in system great enough
to cause pressure drop and
engage Fire Mode
a)
Find and fix leak
