Descaling / Basic Cleaning - Miele PG 8164 Operating Instructions Manual

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12.5 Descaling / basic cleaning

12.5.1 Descaling programme
If the machine is operated with hard water without water treatment, the boiler, the machine interior, all water
lines and other components may scale.
Grease residues and dirt that remain in the machine can contribute towards an unhygienic interior and can
lead to failure of heating elements. Regular removal of these coatings is absolutely essential.
Using the descaling programme you can descale the interior of the commercial dishwasher. The water lines
and the boiler can only be descaled by an authorised service technician.
For descaling, you need an acid-based descaler suitable for commercial dishwashers.
When handling chemicals, observe the safety notes and the dosage recommendations on the
packaging.
Danger
Ideally, start the descaling programme when the machine is empty and switched off. If the machine is
already prepared for use, it will automatically empty first.
Only with an external detergent dispenser pump:
Development of chlorine gas
If you mix active chlorinated detergent and descaler, chlorine gas is produced. Stop the
detergent dosing (e.g. remove the suction tube or switch off the dispenser pump).
Warning
INFO An internal detergent dispenser pump in the machine will be disabled automatically in the descaling
programme.
Starting the descaling programme
 Tap the following buttons in turn:
Descaler causes corrosion
The descaler may not remain in the machine for hours. If you switch off the machine when the
descaling programme is in progress or if you terminate the programme, the machine must be
Warning
emptied, refilled and again emptied. Use the self-cleaning programme for this.
Sequence of the descaling programme:
 With a machine ready for use: The tank is emptied and re-filled without detergent.
 With an empty, switched off machine: The tank is filled without detergent.
 Once the machine is ready for operation, the text "Add descaler. Press start button." appears.
 Open the door and add the descaler on the inside of the machine. Follow the recommended dosage.
INFO The machine's tank capacity is approx. 9.5 litres (PG 8164) / 15.3 litres (PG 8165, PG 8166,
PG 8169).
 Close the door and press the start button.
 The start button lights up in blue. The button continues to flash.
 The descaling solution is circulated in the interior.
 On the display, the time counts down from 600 seconds.
 Once the time has expired, the button stops flashing.
 Open the door and check whether the interior has been sufficiently descaled.
INFO If the door isn't opened within the next 600 seconds, the descaling programme continues
automatically and the machine will be emptied.
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 The button flashes while the
programme is running.