Nespresso EF 474, EF 473 manual Further details in order to take decision

Troubleshooting

Check procedure	Symptoms	Action / repair work	Further action / repair work
	4.1 Machine is not working (no function)	YES - g) Check if electrical wires are functional	YES - Replace electronic mainboard
			NO - Replace defective(s) wire(s)
	- continued
4 Press On/Off button to perform		NO - Go to point 4.2
automatic self test - continued	4.2 Backlighted coffee button blinks at irregular	YES - Check if thermoblock heating element is func-	YES - Replace NTC
		tional	NO - Replace thermoblock
	intervals
		NO - Self test ok. Go to point 5
		YES - a) Water circuit is empty	YES - Fill water circuit (see page 9)
			NO - Go to point b)
		YES - b) Flow meter is clogged	YES - Clean or replace it
			NO - Go to point c)
	5.1 No coffee outlet
		YES - c) Pyramid plate is clogged	YES - Replace CBU
5 Check coffee temperature while			NO - Go to point d)
preparing a coffee (see page 30)		YES - d) Machine is blocked by scale	YES - Descale machine (see page 25)
		NO - Go to point 5.2
	5.2 Temperature is too low (less than 83°C)	YES - Descale the machine (see page 25)
		NO - Go to point 5.3
	5.3 Temperature is too high (more than 89°C)	YES - Change NTC
		NO - Go to point 6
	6.1 Leakage at extraction system	YES - Replace CBU
		NO - Go to point 6.2
	6.2 Leakage at tubes connection	YES - Replace defective tube and seal
6 Check for leaks and check flow		NO - Go to point 6.3
rate (see pages 27, 28 and 29)		YES - Machine is scaled	YES - Descale machine (see page 25)
			NO - Replace pump
	6.3 Flow rate out of range
		NO - No trouble found during the check procedure.	Contact Nespresso Technical Correspondant for
			further details in order to take decision.
7 Descaling process (if needed)	7.1 Machine scaled	YES - Descale machine (see page 25)
		NO - Go to point 8
8 Final cleaning (see page 31)
	End of check procedure

Service Manual EF 473 / EF 474 16 Version 1.0 en