Isomac PRO 3.1, Use And Maintenance Manual, Page: 24 / 36

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Remove the filter-holder from the brewing unit. Clean the brew unit
(11) with the brush (16) supplied. Remove the filter (20-21) from the
filter holder (22-23); place the closed filter (24) inside the filter holder
(22-23), pour a spoonful of coffee-machine detergent powder and fit
the filter holder into the brewing unit to be cleaned. Start the brewing
unit using the unit con trol (15) and interrupt the delivery after appro-
ximately 4-5 seconds.
Start and interrupt the delivery alternatively for approximately one
minute, to allow the removal of coffee and scale deposits. Remove
the closed filter (24) and start the delivery system several times to
rinse the unit.
Deliver a few serving of coffees so as to eliminate any unpleasant
taste from the jets and from the brewing unit.
After a long period of hot water stagnation within the pipes, let the
water flow vertically so as to remove any deposit.
10.3 - FILTER AND FILTER-HOLDER CLEANING
Check frequently the filter holes to remove any coffee deposits.
Prepare about a litre of boiling water with four teaspoons of coffe-
emachine detergent in a suitable container, and immerse the filter
ba-skets and filter-holders in this solution for 20-30 minutes; then rinse
thoroughly under running water.
10.4 - DRAIN TRAY CLEANING
Remove the drain tray grid ( 8 ) and pull out the lower drain tray ( 13 )
in order to clean it from coffee powder residues.
10.5 - CASING CLEANING
Use a damp, non abrasive cloth, without alcohol or solvents, to avoid
damaging the sides, the base and any painted parts.
11 - REPLACING THE GROUP GASKET
If, during delivery, the coffee drips out of the edges of the filterholder
(C), this may be caused by the obstruction of the filter-holder
delivery hole, in which case the hole needs to be cleaned; if the
problem persists or, if when fitting the filter-holder into the brewing
unit it significantly moves beyond the unit centre, the group gasket
needs replacing (B).
For the replacement, it is necessary to lever with a screwdriver for
the removal of the seal (B) and the shower (A). After removing the
seal and hand shower, properly clean the seat before reassembling
the new parts.