North Star 157394 manual Troubleshooting, Symptoms Causes Remedies

TROUBLESHOOTING

SYMPTOMS	CAUSES	REMEDIES
The water pump will not start	The motor thermic protection is open	Check the mains voltage (+/- 5%
		tolerance). Check the phases
		in the plug are connected well.
The water pump will not enter	The no-return valve does not seal	Replace the valve or the gasket
in bypass		and check the pressure valve
		body wear.
	Leakage from the water system	Eliminate the leaks
	of the gun

The water pump does not reach maximum pressure

Nozzle worn	Replace the nozzle
Pressure ball or adjustment housing	Replace the faulty part
worn or spring broken
Pressure valve gaskets worn	Replace the valve gaskets
Pistons seal gasket worn	Replace the gaskets
Nozzle holding head in position	Turn the head on high pressure
low pressure

Strong vibrations on the water pump	Water supply insufficient	Check the water supply flow and
		the relative pressure (2÷10)
		Check the water filter and clean
		it if necessary
		Prime the pump without the lance
	Alien matter under a check valve	Check the valves, clean and reassemble
The burner will not start	Diesel filter blocked	Clean the filter
	Diesel nozzle blocked	Clean the filter
	Worn or broken electrodes	Replace the electrodes
	The pressure switch remains open	Replace the pressure switch
	Safety thermostat is open	Replace the safety thermostat
Anormal noise of Diesel pump	Low diesel	Fill diesel tank or work on cold water
No detergent suction	High viscosity of the employed	Further dilute the detergent
	detergent
	Detergent filter blocked	Clean the filter

- 12 -