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FAULT
PROBABLE CAUSE
REPAIR
When the main switch is turned on the
machine does not start.
The motor hums but does not start.
The motor stops suddenly or after a
while.
When the lance is turned on pressure
values decrease and increase.
To much vibrations at the delivery.
Plug not properly connected.
Connection panel fuses are burnt out.
A phase is missing (in three phase models).
Lows voltage.
High pressure pump is blocked.
The motor-protecting switch is on because
of insufficient mains voltage.
The nozzle is either clogged or deformed.
Either boiler coil or lance are clogged with
limestone.
The pressure tank si run down.
The valve are worn out or dirty.
Carefully check the plug and the electric
cable.
Check them and replace them.
Check the connection panel voltage with
a meter.
Check the mains voltage (Note: do not
connect when voltage drops below 5% of
the rated value).
With the switch on the zero position turn
the motor fan with a screwdriver. If it
remains blocked, check the pump.
Check the value of the mains voltage.
Either clean it or replace it.
Descaling.
Check the pressure in the tank.
Check and/or replace.
1 -
Mains water intake
2 -
Motor-driven pump
3 -
Pressure regulator valve
4 -
Pressure gauge
5 - Relief valve
6 -
Coil
7 -
Boiler casing
8 - Burner
9 -
Exhaust flue
10 -
Thermostat
11 -
Gun
12 - Water outlet opening lever
13 - Lance
14 - Nozzle
15 -
High pressure hose
1
2
5
6
4
8
9
7
11
10
3
12
13
14
15
28
Before doing any work on the machine, disconnect the electricity and water supplies and
discharge the pressure. Proceed systematically to identify faults following the chart below;
if you are still unable to eliminate the problem, call in the Authorized After-Sales Service.
WATER DIAGRAM
TROUBLE SHOOTING
Summary of Contents for NPX4
Page 3: ...3 AVVERTENZE SAFETY PRECAUTIONS AVERTISSEMENTS WARNHINWEISE ADVERTENCIAS WAARSCHUWINGEN...
Page 13: ...13 SCHEMA ELETTRICO...
Page 27: ...27 ELECTRIC DIAGRAM...
Page 41: ...41 SCHEMA LECTRIQUE...
Page 55: ...55 ELEKTROSCHEMA...
Page 69: ...69 ESQUEMA EL CTRICO...
Page 83: ...83 ELEKTRICITEITSSCHEMA...