Nilfisk-ALTO 7309021 Trouble-shooting and possible correction, Problem Possible cause Correction

3.10 Trouble-shooting and possible correction

Problem	Possible cause	Correction
System will not start or stops in	1) Mains power supply cut off	Connect mains power supply
mid-operation
(no indication of fault)	2) Fuses have blown	Check that fuses correspond to power con-
	3) Control voltage fuses in DELTA	sumption (model plate). Renew fuses
	BOOSTER have blown	Call customer engineer
System does not start or stops in	Any of the below faults ia fatal and	When fault has been corrected restart
mid-operation with the following	should be corrected	system - check that the fault indication has
fault indication:		disappeared
C3K	Motor guard on motor 2 cut out:	*)  Call customer engineer
	1) No phase	(C3K pump no. 2 can be withdrawn on the
	2) Pump - motor blocked	steering - see section 3.5 - upon which the
	3) Short-circuit in motor	operation can be resumed)
C3K	Thermal cut-out sensor in motor 3 cut out	*)  Allow the motor to cool
	1) Air intake obstructed	Check the air intake and clean, if necessary
	2) Oil deficiency	Refill with oil.
Water tank	Water level in water tank too low	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

Water tank	Temperature in water tank too high
	(>80°C)
	Temperature in water tank too low (<2°C)

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.

Pipeline / internal hoses	Leakage: external or internal	In case of external leakage: disengage
		any open spray handles, if relevant - repair
		leakage.
		In case of internal leakage: repair leakage
Sensors	Combination of sensor values illegal.	Call customer engineer
	I.e. if the high pressure switch is ON and
	the low pressure switch is OFF.
One or more pumps will not stop	High-pressure cock at outlet point does	Check that all high-pressure cocks at outlet
after end of operation	not close	points have been closed
	Flow sensor return defective	Call customer engineer
Pump restarts at short intervals	The system cannot keep up pressure	Check that all high-pressure cocks at outlet
		points have been closed
Working pressure too low	The high-pressure cock at outlet point	Check that all high-pressure cocks at outlet
	not completely closed	points have been closed.
	Double spray lance used at outlet point	Shift to single spray lance at this outlet
	without injector	point.
	Excessive water consumption	Check whether the water consumption of
		the spray lances used exceeds the capacity
		of the system - shift to other spray lances, if
		necessary

No working pressure	High-pressure cock at one outlet point is
	left open

Shut off the high-pressure cock at outlet points not in use

Irregular working pressure	Air in pump	Vent the system, cf. sect. 2.5.3
(machine vibrates)	Inlet water too hot
		Allow water to cool and check that inlet
		temperature does not exceed 80°C
Water volume at outlet point too	Blockage of filter for inlet water	Clean the filter, cf. sect. 3.9.2
small	Nozzle blocked
		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.

If other faults occur than those enlisted, please contact your nearest Nilfisk-ALTO service centre.

54