DeLonghi BCO 420 User Manual

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disc into the hole of the washer indicated by the arrow in 
fig. 31.

•  Reinstall this assembly in the steel filter container (fig.

32), making sure that the pin is inserted into the hole of 
the support itself (see the arrow in fig. 32). 

•  Finally, screw up the top.
The guarantee will not be valid if the cleaning procedure de-
scribed above is not carried out regularly.

After about every 300 coffees, the boiler nozzle should be clea-
ned in the following manner: 
•  Ensure that the coffee machine is not hot, and that the

plug is disconnected; 

•  Using a screwdriver, undo the screws holding the nozzle

of the espresso boiler  (fig. 33);

•  Remove the boiler nozzle;
•  Clean the boiler with a wet cloth (fig. 33)
•  Wash  the  nozzle  thoroughly  in  hot  water,  scrubbing  it

with a brush. Check that the small holes are not blocked 
and, if necessary, clean them out with a pin (fig. 30).

•  Rinse the nozzle under the tap, continuing to scrub it.
•  Re-mount the boiler nozzle, taking care to position it cor-

rectly on the washer.

The guarantee will not be valid if the cleaning procedure de-
scribed above is not carried out regularly.

1.  Do not use solvents or abrasive detergents to clean the

machine. A soft, wet cloth is sufficient. 

2.   Clean the filter-holder cup regularly, as well as the filters, 

the drip-tray, and the water-tank. To empty the drip-tray, 
remove the cup-stand grill, eliminate any water, and cle-
an the tray with a cloth: then re-assemble the drip-tray. 

During the cleaning operation never immerse the machine in
water. It is an electrical appliance.

De-scaling of the espresso coffee section
It is advisable to de-scale the machine after about every 200 
cups of coffee. The use of De’ Longhi de-scaler is recommended,
available from shops.
Follow the procedure below:
1.   Fill the tank with the de-scaling solution, made by dilu-

ting  the  de-scaler  with  water  according  to  the  instruc-
tions on the packaging.

2.   Switch on the machine by turning the selector knob to 

position    and wait for the OK light to come on. 

3.  Ensure that the filter-holder is not engaged and position a

receptacle under the nozzle of the machine. 

4.  Turn the selector knob to  

 and allow about 1/4 of the 

solution in the tank to flow out. Turn the steam knob from 
time to time and let some of the solution escape through 
the tube of the milk-frother. Then stop, turning the selec-
tor knob to     and leave the solution to act for about 5 
minutes.

5.  Repeat point 4 another 3 times, until the tank has been 

emptied completely.

6.   To eliminate the remains of the solution and the scale, 

rinse out the tank thoroughly, and then refill it with clean 
water (without de-scaler). 

7.  Turn  the  selector  knob  to   

  (fig. 16)  and  let  the 

water  flow  out  until  the  tank  is  completely  empty. 

8.  Repeat operations 6 and 7 once more. 
Repairs to the machine due to problems with scale will not be 
covered by the guarantee if the de-scaling procedure described 
above is not carried out regularly. 

De-scaling of the filter coffee section 
With time, the limestone content of the water can cause ob-
structions which may effect the correct functioning of the ap-
pliance. It is advisable to carry out de-scaling of the machine 
after about every 40 uses. For this de-scaling procedure, use an 
appropriate de-scaler for filter coffee machines, available in the 
shops. If such a product is not obtainable, the operation can be 
carried out in the following way:
1.  Pour 4 cupfuls of water into the jug;
2.  Dissolve 2 spoonfuls (about 30 grams) of citric acid in the

water (available at a chemist’s or grocer’s);

3.  Put the jug on the hot plate;
4.  Press the

, switch, percolate the equivalent of a 

cupful and then switch off the appliance;

5.  Leave the solution to act for 15 minutes. Repeat opera-

tions 4 and 5 another time.

6.   Switch on the machine and continue production until the 

tank is completely empty. 

7.   Rinse out by running the appliance just using water at 

least three times (3 full tanks of water). 

  

Information  regarding  the  correct  disposal  of  the 
product, as decreed by European Directive 2002/96/
EC.

When the product reaches the end of its useful life, it must 
not be disposed of together with household refuse. It can be 
taken to an appropriate recycling centre provided by the local