Nilfisk Alto DELTABOOSTER 7309021 User Manual

54

System will not start or stops in 

mid-operation 

(no indication of fault)

System does not start or stops in 

mid-operation with the following 

fault indication:

C3K 

C3K

Water tank

Water tank

Pipeline / internal hoses

Sensors

One or more pumps will not stop 

after end of operation

Pump restarts at short intervals

Working pressure too low

No working pressure

Irregular working pressure 

(machine vibrates)

Water volume at outlet point too 

small

1

) Mains power supply cut off

2

) Fuses have blown

3

) Control voltage fuses in DELTA 

  

    BOOSTER have blown

Any of the below faults ia fatal and 

should be corrected

Motor guard on motor 2 cut out:

1

) No phase

2

) Pump - motor blocked

3

) Short-circuit in motor

Thermal cut-out sensor in motor 3 cut out

1

) Air intake obstructed

2

) Oil deficiency

Water level in water tank too low

Temperature in water tank too 

(>80°C)

Temperature in water tank too 

low (<2°C)

Leakage: external or internal

Combination of sensor values illegal.

I.e. if the high pressure switch is 

ON and 

the low pressure switch is 

OFF.

High-pressure cock at outlet point does 

not close

Flow sensor 

return defective

The system cannot keep up pressure

The high-pressure cock at outlet point 

not completely closed

Double spray lance used at outlet point 

without injector

Excessive water consumption

High-pressure cock at one outlet point is 

left open

Air in pump

Inlet water too hot

Blockage of filter for inlet water

Nozzle blocked

Connect mains power supply

Check that fuses correspond to power con-

sumption (model plate). Renew fuses

Call customer engineer

When fault has been corrected restart 

system - check that the fault indication has 

disappeared

*)  Call customer engineer 

(C3K pump no. 2 can be withdrawn on the 

steering - see section 3.5 - upon which the 

operation can be resumed)

*)  Allow the motor to cool 

Check the air intake and clean, if necessary

Refill with oil.

Check that the shut-off’s on the water inlets 

are open and clean the inlet filters, if ne-

cessary. Check that the water supply meets 

the requirements stated in sect. 1.5

Allow the water to cool, empty the wa-

tertank, if necessary. Check that the cold 

water connection is open and, if not, that 

the temp. on the hot connection does not 

exceed 75°C.

Empty the water tank, and make sure that 

the temperature of the water inlets are 

above 2°C.
In case of external leakage: disengage 

any open spray handles, if relevant - repair 

leakage.

In case of internal leakage: repair leakage

Call customer engineer

Check that all high-pressure cocks at outlet 

points have been closed

Call customer engineer

Check that all high-pressure cocks at outlet 

points have been closed

Check that all high-pressure cocks at outlet 

points have been closed.

Shift to single spray lance at this outlet 

point.

Check whether the water consumption of 

the spray lances used exceeds the capacity 

of the system - shift to other spray lances, if 

necessary
Shut off the high-pressure cock at outlet 

points not in use

Vent the system, cf. sect. 2.5.3

Allow water to cool and check that inlet 

temperature does not exceed 80°C

Clean the filter, cf. sect. 3.9.2

Clean the nozzle

*)  In both cases the plant will stop and the related control lamp will flash. When restarting the plant, the pump will  

 

 

AUTOMATICALLY cut out, and the operation can be resumed - the control lamp will now be constantly alight.