Nuova Simonelli UK - Trouble-shooting

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Trouble-shooting

This section provides a guide for trouble-shooting and simple remedies. Every possible problem, divided into categories, are associated with the symptoms, diagnostics and possible solutions.

Topics:

> The machine doesn't work

> Machine does not heat or is not pressurised

> No water delivery through the supply unit

> Inconsistent coffee delivery

> Steam valve

> Hot water valve

> Wet coffee grounds (after delivery)

Cross-check the tables below to review all possible faults, defects and maintenance requirements which may arise or be necessary during normal operation.

The machine doesn't work:

SYMPTOM	DIAGNOSTICS	SOLUTION
No Power	Check the main electricity supply	Reset power
	Check electrical connections	Repair or replace the connection
	Check the central unit power supply fuse	Replace the fuse
	Check the on/off switch and the electronic card	Replace the switch of the electronic card
	Check the electronic control unit	Check the electronic control unit

Machine does not heat or is not pressurised:

SYMPTOM	DIAGNOSTICS	SOLUTION
Heating Element (Resistor) Not Powered	Check the correct voltage of the resistor	Reset power
	If the voltage is correct, check the exact polarity on the leads of the resistor	Replace the resistor
	Check the electrical contacts	Repair or replace the contacts
	Reset and check that the safety thermostat is powered	Replace the safety thermostat
	Make sure that the pressure switch is powered	Replace the thermostat
	Where envisaged, make sure that the power relay is powered	Replace the relay
	Incorrect boiler pressure readout (no steam)	Check the anti-vacuum system, replace as required
	Check the main water supply	Reset water
	Make sure the inlet valve is open	Open the inlet valve
	Check the self-leveling function	Replace the self-leveling probe
	Make sure that the self-leveling probe is powered and that the internal piston is not obstructed	If not, make sure that the appropriate fuse in the main control unit is working properly, otherwise replace
	Check the retainer valve	Clean the valve and replace the seal
Too Much Water in the Boiler	Check the auto-level solenoid for leaks	Replace the auto-level solenoid.
	Check the auto-level solenoid voltage	If not working correctly, replace it. If it is working, check the auto-level probe and the control unit
	Check the manual filling valve for leaks	Replace the valve
	Check the heat exchanger for leaks	Replace the boiler
	Check the auto-level valve	Replace the self-leveling probe

No water delivery through the supply unit:

SYMPTOM	DIAGNOSTICS	SOLUTION
Loss of Water	Check the main water supply	Reset water
	Make sure the inlet valve is open	Open the water inlet valve
Loss of Power in the Supply Circuit	Make sure that the 3-way solenoid is powered
	Check the supply circuit button	Replace the main electronic card or the "dashboard" card
Physical Blockage (caused by Deposits or Unusual)	Check gigler clamping	Check gigler clamping
	Check the 3-way solenoid support clamping	Clean or replace it
	Check the 3-way solenoid clamping	Clean or replace it
	Check the connection holes between the sprays and the pre-infusion chamber, the 3-way valve and the gigler	Clean
	Check the secondary retainer valve in the coffee circuit	Replace it
	Check the heat exchanger clamping	Clean it
	Check the doser-gigler clamping	Clean or replace it
Pump	Make sure that pressure is correct (7-9 bar)	Replace the pump
	Check pump rotation	Release or replace it
	Make sure the motor is powered

Inconsistent coffee delivery:

SYMPTOM	DIAGNOSTICS	SOLUTION
Continuous Delivery	Check the electrical connections of the doser	Clean and reconnect
		Replace the doser. If the doser causes impulses, replace the electronic control card
Inconsistent Delivery (Long)	Make sure that the doser generates impulses	Replace the doser. If the doser causes impulses, replace the electronic card
Inconsistent Supply (Short)	Check the expansion valve (neplax) for leaks through the supply unit during delivery	Remove, clean or replace the gasket
	Check the 3-way valve for leaks through the supply unit during delivery	Replace the 3-way solenoid
	Check the retainer valve	Clean or replace the gasket
Too Slow	Sprays blocked	Replace them
	Coffee too light in colour	Adjust the grinding (grinder-doser)
	Gigler clogged	Clean or replace it
	Pump pressure too low	Adjust pump pressure (7-9 bar). Replace the pump
	Check the heat exchanger, the pipes and the gigler for obstructions	Change the pipes, clean the heat exchanger with acid, clean the unit, check the function of the water depurator
Too Fast	Coffee doses too small	Adjust the coffee dose
	Grinding too large	Adjust the setting of the grinder-doser
	Pump pressure too high	Adjust pump pressure (7-9 bar). Replace the pump
Leaks around the Filter-Holder	Check underneath the sheath of the sump	Replace it
	Check the edge of the filter	Replace it

Steam valve:

SYMPTOM	DIAGNOSTICS	SOLUTION
Loss of Steam	Check the valve casings	Clean the valves and replace the sheaths
No Steam	Check the steam sprayers	Clean or replace them. Also see: "Machine does not heat or is not pressurised"

Hot water valve:

SYMPTOM	DIAGNOSTICS	SOLUTION
Loss of Water (Manual)	Check the valve seals	Clean the valves and replace the seals
Loss of Water (Automatic)	Check the solenoid voltage
No Water (Automatic)	Check the solenoid voltage
No Water - only Steam	Check the water level in the boiler	Also see: "Machine does not heat or is not pressurised" and "Water leaks"

Wet coffee grounds (after delivery):

SYMPTOM	DIAGNOSTICS	SOLUTION
Delivery Water Too Cold	Check the water economy valve, if fitted	Adjust the flow using the knob. Replace it.
Water Leaks from the Coffee Grounds in the Filter-Holder after Infusion	Check the position of the blower (Mac Cup & Program)	Fit the blower correctly
	Check the 3-way solenoid discharge	Clean or replace it
	Check the pipe routing from the sprayers to the 3-way solenoid	Clean
	Check the temperature of the unit (external 80-85 °C)
	Check the coffee dose	Adjust the coffee dose (grinder-doser)
	Check the coffee grinding	Adjust the setting of the grinder-doser
	Check the coffee pressing	Inform the user about the correct pressure of the coffee dose