Changing The Chemicals; Descaling The Warewasher; Maintenance By The Customer Service Department; Service Interval - Miele PTD 901 Betriebsanleitung

8.5

Changing the chemicals

Crystallisation can occur as a result of mixing different chemical products, which can damage the dosing device.
The dosing device and the dosing hoses must therefore be flushed with water before a new chemical product is used.
Ø
Remove the suction tube from the canister and place it in a water-filled container.
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Rinse the dosing device with water via the "Priming" menu.
Item Name
1 Rinse aid dosing device
2 Detergent dosing device
Ø
Press button 1 or 2.
ð The button turns white, and the dosing device is activated.
ð The dosing hoses and the dosing device are rinsed out with water.
Ø
As soon as the button goes off, insert the suction tube into the new canister.
Ø
Press button 1 or 2 again.
ð The button turns white, and the dosing device is activated.
ð The water in the dosing hoses and dosing device is replaced by the new chemical product.
The dosing must also be reset.
Ø
Use an authorised service technician to continue to attain good wash results.
8.6

Descaling the warewasher

If the warewasher is operated with hard water and without water treatment, then the boiler, the interior of the machine, all the water
lines and components may develop scale. Limescale deposits and dirt that remain in the machine can contribute towards hygiene risks,
while scaling can lead to failure of heating elements. In case of limescale deposits, the warewasher must be descaled.
The interior of the warewasher can be descaled using the descaling programme (} page 58). We recommend running the descaling
programme at the end of the working day, as the machine's tank is emptied when the programme starts and ends.
The water lines and the boiler can only be descaled by an authorised service technician.
8.7

Maintenance by the customer service department

We recommend that you have an authorised service technician carry out maintenance of the warewasher at least once a year so that
vulnerable components subject to ageing and wear can be checked and replaced accordingly. Original spare parts must be used for re-
pairs or to replace consumable parts.
Consumable parts include:
– Dosing tubes
– Inlet water hose

Service interval

The warewasher control unit specifies the number of operating hours or wash cycles at which the pictogram for
service is shown.
Note: This function is deactivated ex-works. On request, the service technician can activate this function.
Operating instructions
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12020321/01; 2023-07
Cleaning and maintenance
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