Troubleshooting; Checking The Machine On Receipt - Nespresso Essenza EF 470 Service Manual

Troubleshooting

Checking the machine on receipt

The receipt check enables you to rapidly
locate faults on the machine and to initiate
appropriate repair action.
Check procedure
1.1 Parts of housing broken or damaged
1 Check appliance for visible
damage
1.2 Mains cable damaged
2.1 Closing handle works correctly
2 Check mechanical elements
2.2 Is the capsule correctly ejected?
2.3 Is the capsule cage seal damaged?
(feel with a finger if the seal is damaged)
3 Fill water tank 3.1 Water tank is leaking
4 Press On/Off button to perform
4.1 Machine is not working (no function)
automatic self test
Service Manual EF 470 / EF 471
Follow the check procedure.
Repair any faults found and check if the
machine is operating perfectly.
Symptoms
YES - Replace parts if necessary
NO - Go to point 1.2
YES - Replace mains cable
NO - Plug machine to the mains and go to point 2.1
YES - Go to point 2.2
NO - It is hard or impossible to close the closing handle
YES - Go to point 2.3
NO - Replace CBU
YES - Replace CBU
NO - Go to point 3
YES - Replace water tank
NO - Go to point 4
YES - a) Check if mains cable is functional
YES - b) Check if On/Off button is functional
YES - c) Check if pump is working (press coffee
button)
YES - d) Check if coffee button is functional
YES - e) Check if pump's fine wire fuse (128°C) is
defective
YES - f) Check if thermoblock's fine wire fuse (167°C)
is defective
1 3
Action / repair work
YES - Screw on closing handle screws at defined
torque and block them with Loctite 241 (see page
20) or replace CBU
NO - Replace the CBU
YES - Go to point b)
NO - Replace it
YES - Go to point c)
NO - Replace it
YES - Go to point f)
NO - Go to point d)
YES - Go to point e)
NO - Replace it
YES - Replace it
NO - Replace pump
YES - Replace it together with electronic control
board and if necessary the thermoblock
NO - Go to point g)
Further action / repair work
Version 1.1 en