Grundfos SCALA User manual

SCALA
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

Table of contents
2
SCALA
English (GB)
Installation and operating instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Bahasa Indonesia (ID)
Petunjuk pengoperasian dan pemasangan . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

English (GB)
3
English (GB) Installation and operating instructions
Original installation and operating instructions
These installation and operating instructions
describe Grundfos SCALA domestic water supply
pumps.
Sections 1-4 give the information necessary yo be
able to unpack, install and start up the product in a
safe way.
Sections 5-14 give important information about the
product, as well as information on service, fault
finding and disposal of the product.
CONTENTS
Page
1. General information 4
1.1 Target group 4
1.2 Symbols used in this document 4
2. Receiving the product 4
2.1 Inspecting the product 4
2.2 Scope of delivery 4
3. Installing the product 4
3.1 Location 4
3.2 System sizing 4
3.3 Mechanical installation 4
3.4 Foundation 5
3.5 Installation examples 6
3.6 Suction pipe length 7
3.7 Electrical connection 8
4. Starting up the product 8
4.1 Priming the pump 8
4.2 Starting the pump 8
4.3 Shaft seal run-in 8
5. Storing and handling the product 9
5.1 Handling 9
5.2 Storing 9
5.3 Winterizing 9
6. Product introduction 9
6.1 Product description 9
6.2 Application 9
6.3 Pumped liquids 9
6.4 Identification 10
7. Control functions 12
7.1 Menu overview, SCALA2 12
8. Operating the controller 13
8.1 Setting the outlet pressure 13
8.2 Locking and unlocking the operating
panel 13
8.3 Expert settings, SCALA2 13
8.4 Resetting to factory settings 15
9. Starting up the product after shutdown
or standstill 15
9.1 Deblocking the pump 15
9.2 Controller settings 15
9.3 Priming 15
10. Servicing the product 15
10.1 Maintaining the product 15
10.2 Customer service information 16
10.3 Service kits 16
11. Taking out of operation 16
12. Fault finding the product 17
12.1 Grundfos Eye operating indications 17
12.2 Fault resetting 17
12.3 Fault finding chart 18
13. Technical data 21
13.1 Operating conditions 21
13.2 Mechanical data 21
13.3 Electrical data 21
14. Disposal 21
Warning
Prior to installation, read this document
and the quick guide. Installation and
operation must comply with local
regulations and accepted codes of good
practice.
Warning
This product can be used by children of
eight years and up and persons with
reduced physical, sensory or mental
capabilities or lack of experience and
knowledge if they are under supervision or
have been instructed in the safe use of the
product and understand the hazards
involved.
Children must not play with the product.
Cleaning and maintenance of the product
must not be made by children without
supervision.
&DXWLRQ This pump has been evaluated for use with
water only.
Warning
Risk of electric shock.
This pump has a grounding conductor and
grounding-type attachment plug. To reduce
the risk of electric shock, be certain that
the pump is connected only to a properly
grounded, grounding-type receptacle.

English (GB)
4
1. General information
1.1 Target group
These installation and operating instructions are
intended for professional installers.
1.2 Symbols used in this document
2. Receiving the product
2.1 Inspecting the product
Check that the product received is in accordance
with the order.
Check that the voltage and frequency of the product
match voltage and frequency of the installation site.
See section 6.4.1 Nameplate.
2.2 Scope of delivery
The box contains the following items:
• 1 Grundfos SCALA pump
• 1 quick guide
• 1 safety instructions booklet.
3. Installing the product
3.1 Location
The pump can be installed indoors or outdoors, but it
must not be exposed to frost.
We recommend that you install the pump near a
drain or in a drip tray connected to a drain in order to
lead away possible condensation from cold surfaces.
3.1.1 Minimum space
The pump requires a minimum space of 430 x 215 x
325 mm (17 x 8.5 x 12.8 inches).
Even though the pump does not require much space,
we recommend that you leave enough space for
service and maintenance access.
3.1.2 Installing the product in frosty environment
Protect the pump from freezing if it is to be installed
outdoors where frost may occur.
3.2 System sizing
The pump is factory-set to three bar outlet pressure
which can be adjusted according to the system in
which it is incorporated.
The tank precharge pressure is 1.25 bar (18 psi).
In case of suction lift of more than six metres, the
pipe resistance on the outlet side must be at least
two metres water column or 3 PSI at any given flow
in order to obtain optimum operation.
3.3 Mechanical installation
Warning
If these safety instructions are not
observed, it may result in personal injury.
Warning
If these instructions are not observed, it
may lead to electric shock with consequent
risk of serious personal injury or death.
&DXWLRQ
If these safety instructions are not
observed, it may result in malfunction or
damage to the equipment.
1RWH
Notes or instructions that make the job
easier and ensure safe operation.
&DXWLRQ
If the unlikely event of an internal leakage
occurs, the liquid will be drained through
the bottom of the pump and/or through the
pump cover instead of causing damage to
the pump.
Install the pump in such a way that no
undesirable collateral damage can arise.
Warning
The system in which the pump is
incorporated must be designed for the
maximum pump pressure.
Warning
Before starting any work on the product,
make sure that the power supply has been
switched off and that it cannot be
accidentally switched on.

English (GB)
5
3.4 Foundation
Fasten the pump to a solid horizontal foundation by
means of screws through the holes in the base plate.
See figures 1 and 2.
Fig. 1 Horizontal foundation
Fig. 2 Base plate
3.4.1 Pipework
Make sure that the pump is not stressed by the
pipework.
The pumps are equipped with flexible connections,
± 5 °, to facilitate the connection of inlet and outlet
pipes. The inlet and outlet ports can be loosened by
turning the union nuts by hand.
1. Carefully screw the inlet and outlet connections
on to the inlet and outlet ports using a pipe
wrench or similar tool.
2. Then fit the connections to the inlet and outlet
holding the connections with one hand, and
tightening the union nuts with the other hand.
See fig. 3.
Fig. 3 How to fit the connections
3.4.2 How to reduce noise in the installation
Vibrations from the pump may be transferred to the
surrounding structure and create noise in the
20-1000 Hz spectrum, also called the bass
spectrum.
Correct installation using a vibration-damping rubber
pad, flexible hoses and correctly placed pipe
hangers for rigid pipes can reduce the noise
experienced by up to 50 %. See fig. 4.
Place pipe hangers for the rigid pipes close to the
connection of the flexible hose.
Fig. 4 How to reduce noise in the installation
TM06 5729 5315TM06 3809 1015
A 130 mm 5.12 inches
B 181 mm 7.13 inches
C 144 mm 5.67 inches
&DXWLRQ Always loosen and tighten inlet and outlet
union nuts by hand.
B
A
C
TM06 4318 1915TM06 4321 1915
Rubber pad
Pipe hanger for rigid pipe
Flexible hose

English (GB)
6
3.5 Installation examples
Fittings, hoses and valves are not supplied with the
pump.
3.5.1 Mains water pressure boosting
Fig. 5 Mains water pressure boosting
3.5.2 Suction from a well
Fig. 6 Suction from a well
TM06 4347 2015
Pos. Description
1 Highest tapping point
2 Pipe hangers and supports
3 Isolating valves
4 Flexible hoses
5 Bypass valve
6
Optional pressure-reducing valve on the
inlet side if the inlet pressure can exceed
10 bar (145 psi)
7
Optional pressure-relief valve on the outlet
side if the installation cannot stand up to a
pressure of 6 bar (85 psi)
8
Drip tray. Install the pump on a small stand
to avoid the ventilation holes from being
flooded.
9 Pressure gauge
10 Mains water pipe
49
1
37
2
5
10
62
3
8
TM06 4349 2015
Pos. Description
1 Highest tapping point
2 Isolating valve
3
Inlet filter.
If the water can contain sand, gravel or
other debris, please install a filter on the
inlet side to protect the pump and
installation.
4 Foot valve with strainer
H1 Maximum suction lift is 8 m (29 ft)
H2 Inlet pipe must be submersed at least 0.5
m (1.64 ft)
H2 H1
4
3
2
1

English (GB)
7
3.5.3 Suction from freshwater tank
Fig. 7 Suction from freshwater tank
3.6 Suction pipe length
The overview below shows the different possible
pipe lengths, depending on the vertical pipe length.
The overview is only intended as a guide.
Fig. 8 Suction pipe length
Preconditions:
Maximum flow velocity: 1 l/s (16 gpm)
Inside roughness of pipes: 0.01 mm (0.0004 inch).
TM06 4348 2015
Pos. Description
1 Highest tapping point
2 Pipe hangers
3 Isolating valve
4 Flexible hoses
5 Drain to sewer
6 Foot valve with strainer
7 Freshwater tank
min1
1
2
34
7
6
5
TM06 4372 2115
DN 32 DN 40
H
[m (ft)]
L
[m (ft)]
H
[m (ft)]
L
[m (ft)]
0 (0) 68 (223) 0 (0) 207 (679)
3 (10) 43 (141) 3 (10) 129 (423)
6 (20) 17 (56) 6 (20) 52 (171)
7 (23) 9 (30) 7 (23) 26 (85)
8 (26) 0 (0) 8 (26) 0 (0)
Size Inside pipe
diameter Pressure loss
DN 32 28 mm
(1.1 inches)
0.117 m/m
(5 psi/100 ft)
DN 40 35.2 mm
(1.4 inches)
0.0387 m/m
(1.6 psi/100 ft)
H
L

English (GB)
8
3.7 Electrical connection
3.7.1 Plug connection
The pump incorporates current and temperature
dependent motor protection.
3.7.2 Connections without plug
4. Starting up the product
4.1 Priming the pump
1. Unscrew the priming plug and pour minimum 1.7
litres (0.45 gallons) of water into the pump
housing. See fig. 9.
2. Screw the priming plug on again.
4.2 Starting the pump
1. Open a tap to prepare the pump for venting.
2. Insert the power plug into the socket or turn on
the power supply and the pump will start.
3. When water flows without air, close the tap.
4. Open the highest tapping point in the installation,
preferably a shower.
5. Adjust the pressure to the required pressure by
means of the buttons.
6. Close the tapping point.
Startup has been completed.
Fig. 9 Priming the pump
4.3 Shaft seal run-in
The shaft-seal faces are lubricated by the pumped
liquid, meaning that there may be a certain amount
of leakage from the shaft seal.
When the pump is started up for the first time, or
when the shaft seal has been replaced, a certain
run-in period is required before the leakage is
reduced to an acceptable level. The time required for
this depends on the operating conditions, that is,
every time the operating conditions change, a new
run-in period will be started.
Under normal conditions, the leaking liquid will
evaporate. As a result, no leakage will be detected.
Warning
Check that the voltage and frequency of
the product match voltage and frequency
of the installation site.
Warning
If the power supply cable is damaged, it
must be replaced by the manufacturer, his
service agent or similarly qualified persons
in order to avoid hazard.
Warning
As a precaution, the product must be
connected to a socket with earth
connection.
1RWH
We recommend that you fit the permanent
installation with an earth leakage circuit
breaker (ELCB) with a tripping current < 30
mA.
Warning
The electrical connection must be carried
out by an authorised electrician in
accordance with local regulations.
Warning
Before making any connections in the
product, make sure that the power supply
has been switched off and that it cannot be
accidentally switched on.
The product must be connected to an
external mains switch with a contact gap of
at least 3 mm (0.12 inch) in all poles.
&DXWLRQ Do not start the pump until it has been
filled with liquid.
1RWH
If the suction depth exceeds 6 m (20 ft), it
may be necessary to prime the pump more
than once.
&DXWLRQ Always tighten priming and drain plugs by
hand.
TM06 4204 1615

English (GB)
9
5. Storing and handling the product
5.1 Handling
5.2 Storing
In case the pump is to be stored for a period of time,
drain it and store it in a dry location.
Temperature range during storing must be -40 to 70
°C (104 to 158 °F).
5.3 Winterizing
If the pump is going to be out of operation during the
winter and can be exposed to frost, it must be
disconnected from the power supply and winterized.
Proceed as follows:
1. Stop the pump by means of the on/off button .
2. Disconnect the power supply.
3. Open a tap to release the pressure in the pipe
system.
4. Close the isolating valves and/or drain the pipes.
5. Gradually loosen the priming plug to release the
pressure in the pump.
6. Remove the drain plug to drain the pump. See
fig. 10.
Fig. 10 Draining the pump
5.3.1 Startup after the winter
Check that the pump is not blocked by following the
steps in section 9.1 Deblocking the pump.
See section 4. Starting up the product.
6. Product introduction
6.1 Product description
Fig. 11 Grundfos SCALA pump
6.2 Application
The pump is suitable for pressure boosting of fresh
water in domestic water supply systems.
6.3 Pumped liquids
The pump is designed for clean fresh water and
chlorinated water < 300 ppm.
&DXWLRQ Take care not to drop the pump as it may
break.
TM06 4203 1615
TM06 3818 1015
Pos. Description
1 Air valve for built-in pressure tank
2Operating panel. See section 7. Control
functions.
3 Nameplate. See section 6.4.1 Nameplate.
4Plug for access to pump shaft. See section
9.1 Deblocking the pump.
5Priming plug. See section 4.1 Priming the
pump.
6Outlet opening. With ± 5 ° flexible
connection. See section 3.4.1 Pipework.
7Inlet opening. With ± 5 ° flexible
connection. See section 3.4.1 Pipework.
8 Drain plug. See section 5.3 Winterizing.
9 Ventilation holes. Must not be flooded.
15
6
7
8
2
3
4
9

English (GB)
10
6.4 Identification
6.4.1 Nameplate
Fig. 12 Example of nameplate
TM06 4340 2015
Pos. Description
1 Type designation
2 Product number
3 Serial number
4 Production code (year and week)
5 Maximum head
6 Minimum head
7 Rated head
8 Rated flow rate
9 Maximum ambient temperature
10 IP class
11 Maximum operation pressure
12 Maximum liquid temperature
13 Minimum and maximum rated power
14 Model
15 Voltage and frequency
16 Approvals
17 Minimum and maximum rated current
DK-8850 Bjerringbro, Denmark
SCALA2 3-45 AKCHDE
Model A
200-240V 50/60Hz
Made in Serbia
P/N 99999999
S/N 
P/C 1519
H
max
H min
H nom
Q nom
45 m
16 m
27 m
3m /h
3
45 C/
55 C
T amb.max
IPX4D
I(A)
Min.
Max.
P1(W)
0.01
2.8 550
2
T
liq.max /P syst.max:
1MPa
NRP XXX-XXX-XXXXXX
PCS XXXXX.XX.XX 04-6292.2.41-2003
LSPr-022-IDN
1
2
3
4
5
6
7
8
9
10
11
13
14
15
16
1
12

English (GB)
11
6.4.2 Type key
SCALA2 3 -45 A K C H D E
Type range
SCALA1 Economy
SCALA2 Comfort
Rated flow rate
3: [m3/h]
Maximum head
45: [m]
Material code
A: Standard
Supply voltage
K: 1 x 200-240 V, 50/60 Hz
M: 1 x 208-230 V, 60 Hz
V: 1 x 115 V, 60 Hz
W: 1 x 100-115 V, 50/60 Hz
Motor
C: High-efficiency motor with frequency converter
Mains cable and plug
A: Cable with plug, IEC type I, AS/NZS3112, 2 m
B: Cable with plug, IEC type B, NEMA 5-15P, 6 ft
C: Cable with plug, IEC, type E&F, CEE7/7, 2 m
D: Cable without plug, 2 m
G: Cable with plug, IEC type G, BS1363, 2 m
H: Cable with plug, IEC type I, IRAM 2073, 2 m
J: Cable with plug, NEMA 6-15P, 6 ft
Controller
D: Integrated frequency converter
Thread
A: R 1" EN 1.4308
C: NPT 1" EN 1.4308
E: R 1" composite material
F: NPT 1" composite material

English (GB)
12
7. Control functions
7.1 Menu overview, SCALA2
Fig. 13 SCALA2 operating panel
7.1.1 Pressure indicator, SCALA2
The pressure indicator shows the required outlet
pressure from 1.5 to 5.5 bars (22 to 80 psi) in 0.5 bar
(7.5 psi) intervals. The illustration below shows a
pump set to 3 bar (44 psi) indicated by two green
lights and a pump set to 3.5 bar (51 psi) indicated by
one green light.
Fig. 14 SCALA2 outlet pressure indication
Fig. 15 Pressure indication table
TM06 3301 5114
SCALA2 Function
On/off
Increases the outlet pressure
Decreases the outlet pressure
Resets alarms
Indicates the required outlet pressure
Indicates that the pump has been
stopped manually
Indicates that the operating panel is
locked
TM06 4345 2015TM06 4187 1615
1RWH
The pressure settings 4.5, 5.0 and 5.5 bar
(65, 73 and 80 psi) require a minimum
positive inlet pressure which is maximum 4
bar (58 psi) lower than the required outlet
pressure.
Example: If the required outlet pressure is
5 bar, the minimum inlet pressure must be
1 bar (14.5 psi).
BAR PSI Water colum kPa MPa
[m]
5.5 80 55 550 0.55
5.0 73 50 500 0.50
4.5 65 45 450 0.45
4.0 58 40 400 0.40
3.5 51 35 350 0.35
3.0 44 30 300 0.30
2.5 36 25 250 0.25
2.0 30 20 200 0.20
1.5 22 15 150 0.15
}
}
}
}

English (GB)
13
7.1.2 Indicator lights, SCALA2
* For fault number 4, dry-running, the pump must
be reset manually. For fault number 4, water
shortage, and the remaining faults, 1, 2, 3, 5, 6
and 7, the pump will reset whenever the cause
has disappeared or been remedied. See section
8.3.2 Auto reset.
For further information about system status, see
section 12.1 Grundfos Eye operating indications.
8. Operating the controller
8.1 Setting the outlet pressure
Adjust the outlet pressure by pressing .
8.2 Locking and unlocking the operating
panel
The operating panel can be locked, which means
that the buttons do not function and no settings can
be changed accidentally.
How to lock the operating panel
1. Hold down the buttons simultaneously for
three seconds.
2. The operating panel is locked when symbol
lights up.
How to unlock the operating panel
1. Hold down the buttons simultaneously for
three seconds.
2. The operating panel is unlocked when symbol
turns off.
8.3 Expert settings, SCALA2
The expert setting menu allows the installer to toggle
between the functions "Auto reset", "Anti cycling"
and "Maximum continuous operating time".
Indications Description
Operating indications
The operating panel is locked
Power supply failure
The pump is blocked, e.g. the
shaft seal has seized up
Leakage in the system
Dry-running or water shortage*
The maximum pressure has been
exceeded or the setpoint cannot
be reached
The maximum runtime has been
exceeded
The temperature is outside the
range
1RWH
Expert settings are for installers only.

English (GB)
14
8.3.1 Accessing the expert settings
Proceed as follows:
1. Hold down the button for five seconds.
2. The symbol will start flashing to indicate that
the expert settings are active.
The pressure indicator now acts as the expert
"menu". A flashing green diode is the cursor. Move
the cursor using the buttons, and toggle the
selection on or off using the button. The diode
for each setting will light up when the setting is
active.
Fig. 16 Expert "menu" overview
8.3.2 Auto reset
The factory setting for "Auto reset" is "on".
On:
This function allows the pump to automatically check
if the operating conditions are back to normal. If the
operating conditions are back to normal, the alarm
indication will be reset automatically.
The "Auto reset" function works in the following way:
For indications, see section 7.1.2 Indicator lights,
SCALA2.
Off:
All alarms must be reset manually by means of the
button.
8.3.3 Anti cycling
The factory setting for "Anti cycling" is "off".
This function monitors the stops and starts of the
pump.
Off:
If the pump starts 40 times in a fixed pattern, there
will be an alarm. The pump will remain in operation
as normal.
On:
If the pump starts and stops in a fixed pattern, there
is a leakage in the system, and the pump will stop
and show alarm 3.
Move cursor up
Move cursor down
Toggle settings
TM06 4346 2015
Auto reset
Anti cycling
Maximum continuous
operating time
Exit expert "menu"
Indication Action
Water shortage
The pump will attempt eight
restarts at five-minute intervals.
If not successful, this cycle will
be repeated after 24 hours.
Dry running
(pump not
primed)
Prime the pump and reset it
manually.
All other
indications
The pump will attempt three
restarts within the first 60
seconds, then eight restart
attempts at five-minute intervals.
If not successful, this cycle will
be repeated after 24 hours.
Leakage in the system.

English (GB)
15
8.3.4 Maximum continuous operating time
The factory setting for "Maximum continuous
operating time" is "off".
This function is a timer that can turn off the pump if it
runs continuously for 30 minutes.
Off:
If the pump exceeds the running time of 30 minutes,
the pump will run depending on the flow.
On:
If the pump exceeds the running time of 30 minutes,
the pump will stop after 30 minutes of continuous
operation, and it will show alarm 6. This alarm will
always need to be reset manually.
8.4 Resetting to factory settings
The pump can be reset to factory setting by pressing
the buttons simultaneously for five seconds.
9. Starting up the product after
shutdown or standstill
9.1 Deblocking the pump
The end cover incorporates a plug which can be
removed by means of a suitable tool. This makes it
possible to deblock the pump shaft if it has seized up
as a result of inactivity.
Fig. 17 Deblocking the pump
9.2 Controller settings
The pump will remember the controller settings even
if it is turned off.
9.3 Priming
If the pump has been drained, it must be filled with
liquid before startup. See section 4. Starting up the
product.
10. Servicing the product
10.1 Maintaining the product
10.1.1 Insect filter
The pump has an insect filter to prevent insects from
nesting in the pump.
The filter is placed on the bottom and can easily be
removed and cleaned with a stiff brush. See fig. 18.
Clean the insect filter once a year or as needed.
Fig. 18 Insect filter
10.1.2 Inlet and outlet valves
The pump is maintenance-free, but we recommend
that you check and clean the inlet and outlet
non-return valves once a year or as needed.
Fig. 19 SCALA pump
Maximum runtime exceeded.
Warning
Before starting any work on the product,
make sure that the power supply has been
switched off and that it cannot be
accidentally switched on.
TM06 4202 1615
Warning
Before starting any work on the product,
make sure that the power supply has been
switched off and that it cannot be
accidentally switched on.
TM06 4537 2515TM06 3818 1015
15
6
7
8
2
3
4
9

English (GB)
16
To remove the inlet non-return valve, follow the
steps below:
1. Turn off the power supply and disconnect the
power plug.
2. Shut off the water source.
3. Open a tap to release the pressure in the pipe
system.
4. Close the isolating valves and/or drain the pipes.
5. Gradually open and remove the priming plug.
See fig. 19 (5).
6. Remove the drain plug and drain the pump. See
fig. 19 (8).
7. Unscrew the union nut holding the inlet
connection. See fig. 19 (7). Depending on the
installation type, it may be necessary to remove
the pipes from both the inlet and outlet
connections.
8. Pull out the inlet connection.
9. Pull out the inlet non-return valve.
10. Clean the non-return valve with warm water and
a soft brush.
11. Assemble the components in reverse order.
To remove the outlet non-return valve, follow the
steps below:
1. Turn off the power supply and disconnect the
power plug.
2. Shut off the water source.
3. Open a tap to release the pressure in the pipe
system.
4. Close the isolating valves and/or drain the pipes.
5. Gradually open and remove the priming plug.
See fig. 19 (5). The plug and non-return valve are
one unit.
6. Clean the non-return valve with warm water and
a soft brush.
7. Assemble the components in reverse order.
Fig. 20 Outlet and inlet non-return valves
10.2 Customer service information
For further information on service parts, see
Grundfos Product Center on
www.product-selection.grundfos.com.
10.3 Service kits
For further information on service kits, see Grundfos
Product Center on www.grundfos.com.
11. Taking out of operation
For further information on how to take the product
out of operation, see end-of-life documentation on
www.grundfos.com.
TM06 4331 1915
Outlet non-return
valve
Inlet non-return
valve

English (GB)
17
12. Fault finding the product
12.1 Grundfos Eye operating indications
12.2 Fault resetting
You can reset a fault indication in one of the
following ways:
• When you have eliminated the fault cause, reset
the pump manually by pressing the button.
The pump will then revert to normal duty.
• If the fault disappears by itself, the pump will
attempt to reset automatically and the fault
indication will disappear if automatic reset is
successful and provided that you have enabled
"Auto reset" in the service menu.
Grundfos Eye Indication Description
No lights are on. The power is off.
The pump is not running.
Two opposite green indicator
lights running in the direction of
rotation of the pump.
The power is on.
The pump is running.
Two opposite green indicator
lights at a 45 ° angle is the icon
used throughout this document
for pump running.
The power is on.
The pump is running.
Two opposite green indicator
lights permanently on.
The power is on.
The pump is not running.
Two opposite red indicator lights
flashing simultaneously.
Alarm.
The pump has stopped.
Two opposite red indicator lights
is the icon used throughout this
document for pump stopped.
Alarm.
The pump has stopped.

English (GB)
18
12.3 Fault finding chart
Warning
Before starting fault finding, switch off the
power supply.
Make sure that the power supply cannot
be accidentally switched on.
Fault
Grundfos Eye Indicator light Automatic reset
Cause Remedy
1. The pump is
not running.
--
a) Power supply failure Switch on the power
supply.
Check the cables and
cable connections for
defects and loose
connections and check
for blown fuses in the
electrical installation.
Yes
b) The power supply is out
of prescribed voltage
range
Check the power supply
and the pump
nameplate. Reestablish
the power supply within
the prescribed voltage
range.
No
c) The shaft seal has seized
up
See section 9. Starting
up the product after
shutdown or standstill.
No
d) The pump is blocked by
impurities
See section 9. Starting
up the product after
shutdown or standstill.
Contact Grundfos
Service if the problem
persists.
Yes
e) Dry running Check the water source,
and prime the pump.
No
f) The maximum runtime
has been exceeded Check the installation for
leakage and reset the
alarm.
No
g) The internal non-return
valve is defective or
blocked in completely or
partly open position
Clean, repair or replace
the non-return valve.
See section
10. Servicing the
product.

English (GB)
19
2. The pump is
running.
-
a) Leakage from the
pipework, or the
non-return valve is not
properly closed due to
impurities
Check and repair the
pipework, or clean,
repair or replace the
non-return valve.
-
b) Small continuous
consumption
Check the taps and
reconsider the usage
pattern (ice machines,
water evaporators for
air-conditioning, etc.).
-
c) The temperature is below
freezing point Consider protecting the
pump and the installation
against frost.
3. Pump
performance
is insufficient. --
a) The pump inlet pressure
is too low Check the inlet
conditions of the pump.
-
b) The pump is undersized. Replace the pump with a
bigger pump.
--
c) The inlet pipe, the inlet
strainer or the pump is
partly blocked by
impurities
Clean the inlet pipe or
the pump.
--
d) Leakage in the inlet pipe
Repair the inlet pipe.
--
e) Air in the inlet pipe or the
pump
Prime the inlet pipe and
the pump.
Check the inlet
conditions of the pump.
--
f) The required outlet
pressure is too low for the
installation
Increase the pressure
setting (arrow up).
Yes
g) The maximum
temperature has been
exceeded and the pump
is running at reduced
performance
Check the cooling
conditions. Protect the
pump against direct
sunlight or any nearby
heat sources.
Fault
Grundfos Eye Indicator light Automatic reset
Cause Remedy

English (GB)
20
4. System
overpressure.
Yes
a) The setpoint has been set
too high. The difference
between the outlet
pressure and the inlet
pressure must not exceed
4 bar (58 psi).
Example: If the required
outlet pressure is 5 bar
(73 psi), the minimum
inlet pressure must be 1
bar (14.5 psi).
Reduce the setpoint to 4
bar (58 psi) + positive
inlet pressure.
Yes
b) The maximum pressure
has been exceeded - the
inlet pressure is higher
than 6 bar, 0.6 MPa (85
psi)
Check the inlet
conditions.
Yes
c) The maximum pressure
has been exceeded -
equipment elsewhere in
the system causes a high
pressure at the pump
(e.g. water heater or
defective safety
equipment)
Check the installation.
5. You can reset
the pump, but
it runs only for
a few
seconds.
Yes
a) Dry running or water
shortage Check the water source,
and prime the pump.
Yes
b) The inlet pipe is blocked
by impurities Clean the inlet pipe.
Yes
c) The foot or non-return
valve is blocked in closed
position
Clean, repair or replace
the foot or non-return
valve.
Yes
d) Leakage in the inlet pipe
Repair the inlet pipe.
Yes
e) Air in the inlet pipe or the
pump
Prime the inlet pipe and
the pump. Check the
inlet conditions of the
pump.
6. You can reset
the pump, but
it starts
repeatedly,
immediately
after stopping.
No
a) The internal non-return
valve is defective or
blocked in completely or
partly open position.
Clean, repair or replace
the non-return valve.
No
b) The tank precharge
pressure is not correct.
Adjust the tank
precharge pressure to
70 % of the required
outlet pressure.
Fault
Grundfos Eye Indicator light Automatic reset
Cause Remedy