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The pump does not reach the fixed
pressures.
Irregular pressure fluctuations.
Pressure leakage.
Noisiness.
Water is in the oil.
Filtrations of water from the drains between
casing and head.
Filtrations of oil from the drains between
head and casing.
Turning on the burner switch the boiler
does not start.
The pump sucks air.
The valves are worn out.
The setting valve area is worn out.
The nozzle is unsuitable or worn out.
The seals are worn out.
The suction and/or delivery valves are worn
out.
Presence of foreign matters in the valves,
which generate bad functioning.
Air suction.
The seals are worn out.
The nozzle is worn out.
The suction and/or delivery valves are
broken or down.
Presence of foreign matters in the
valves, which generate the valves bad
functioning.
The setting valve area is worn out.
The seals are worn out.
Air suction.
The suction and/or delivery valve springs
are broken or down.
Foreign matters in the suction and delivery
valves.
The bearings are worn out.
Extreme liquid temperature.
The O-ring casing is worn out.
High moisture in the air.
The seals are completely worn out.
The seals are worn out.
The piston is worn out.
The O-ring of the piston cap is worn out.
O-ring seals of casing are worn out.
No fuel.
Fuel filter is clogged.
Fuel pump is either blocked or burnt out.
Damaged thermostat.
Ignition spark insufficient or totally lacking.
Check the suction pipes.
Check and/or replace.
Check and/or replace.
Check and/or replace.
Check and/or replace.
Check and/or replace.
Check and clean the replace.
Check the suction pipe.
Check and/or replace the seals.
Replace the nozzle.
Check and/or replace the valves.
Check and clean the valves.
Check and/or replace the setting valve
area.
Replace the seals.
Check the suction pipes.
Replace the valve springs.
Check and clean the suction and delivery
valves.
Replace the bearings.
Reduce the liquid temperature.
Check and/or replace the O-ring.
Replace the oil with double frequency in
respect of the one suggested.
Replace the seals.
Replace the seals.
Replace the piston.
Replace the seal.
Replace the seals.
Check the level in the tank and check
whether the rigid suction pipe is clean.
Replace the line filter.
Replace it.
Replace it.
Check operation of the ignition trasformer
and, if necessary, replace it.
FAULT
PROBABLE CAUSE
REPAIR
29
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...