Dishwasher Care and Maintenance General DTD no.
Technical Information Dishwasher Care and Maintenance General - Table of Content 1.0 Notes ..............................................................................................................4 1.1 Dishwasher cleaning and care.................................................................4 2.0 Cleaning agents.............................................................................................5 2.1 Detergent...............................................................................
Technical Information Dishwasher Care and Maintenance General - Table of Content (continued) 5.13 Residues in cabinet ...............................................................................42 5.14 Wearing out of rubber parts ...................................................................43 5.15 Powder detergent in dispenser clogged and not properly flushed out ...43 5.16 Dishes not properly dry..........................................................................
Technical Information 1.0 Notes 1.1 Dishwasher cleaning and care General information 1. The filter combination must be emptied and cleaned regularly. 2. If wash results deteriorate noticeably, the spray arm jets should be checked and cleaned carefully to remove any soil that may have collected. 3.
Technical Information 2.0 Cleaning agents 2.1 Detergent Detergent is available in various forms such as powder, detergent tablets (tabs), gel/liquid or as part of a combination product. As well as detergent, combination products may also contain rinse aid (“2 in 1 tab”). In addition, “3 in 1 tabs” also contain a salt substitute. However, their use is only recommended with a water hardness of up to 21gr/gal.
Technical Information 2.2 Rinse aid Rinse aid is used to ensure that the load is dry, with a universal sheen and free of filming, streaking or stains at the end of the wash program. Depending on setting, between 2 and 6 ml rinse aid is used per wash. Rinse aid ensures optimal wetting of the load and at the same time leads to sheeting of the rinse water as it drains off. The better the water drains off, the better the drying of the load and the less the tendency for marks to remain on items.
Technical Information 2.3 Reactivation salt Some dishwashers are provided with a water softener, which must be filled regularly with reactivation salt to ensure efficient operation. For further information, see 4.5 Water softening and reactivation. Pure reactivation salt dissolves without residue. For this reason only special reactivation salt or pure evaporated salt may be used in the water softener.
Technical Information 2.4 Combination products (2 in 1, 3 in 1) Function These products are a combination of detergent and rinse aid (2 in 1) or detergent, rinse aid and salt substitute (3 in 1) and are dispensed during the main wash step. The function of combination products is based on the fact that they dissolve in stages and do not lose their effectiveness when water is drained off. Their effectiveness is transferred from wash cycle to rinse cycles. This is known as the carry-over effect.
Technical Information If complaints are received concerning poor drying results when using combination products, these should be redirected to the detergent manufacturer. To achieve good cleaning and drying results, the following should be noted: 1. Combination detergent should only be used within the water hardness range given by the manufacturer! 2. Select programs without a second interim rinse, otherwise the carry-over effect cannot be ensured. 3.
Technical Information 3. Builder, co–builder and salt substitute (phosphates, polycarboxylates, phosphonates): To bind water hardness elements, remove tea stains and disperse soil and food residues. 4. Enzymes (biological constituents): Amylase breaks down starch residues. Protease splits protein molecules into smaller constituents, which can then be released by the suds. 5. Wetting agent (non-ionic tensides): To reduce the surface tension of the water.
Technical Information Chemical composition / Function of various components: 1. Wetting agent (non-ionic tensides): To reduce the surface tension of the water. The load is thoroughly wetted and foam-free washing is ensured. 2. Solubilizer (alcohol, xylolsulphonate or cumolsulphonate): To ensure stability of the rinse aid by preventing the components separating out. Rubber seals remain elastic. 3.
Technical Information 2.6 Deodorant If dirty dishes are left in the dishwasher for a long period, unpleasant odors can develop quickly. A special deodorant to counter this can be hung in the interior. Such deodorant is generally effective for about 50 wash cycles. Note When positioning the deodorant, care must be taken to ensure that the spray arms are not hindered. 2.7 Glass protection products Additional products are available on the market to protect glass items against glass corrosion.
Technical Information 3.0 Dishwasher load 3.1 General information The dishwasher load can be divided into two broad groups. 1. Items for food preparation: Aluminum, steel (pot, pans), oven-proof dishes (casserole dishes), etc. 2. Items for food consumption: Porcelain, glass, silver and stainless steel cutlery, etc. 3.
Technical Information 2. Borosilicate glass: More durable glass resistant to the effects of chemicals and sharp temperature changes (cooking and baking, and laboratory glassware). 3. Crystal glass: Colorless, highly pure glass (table glassware, gift items) with increased potassium content. 4. Lead crystal glass: Glass with a particularly brilliant appearance and high specific weight (cut glass, luxury items) with at least 24% lead oxide content.
Technical Information Corrosion - General information: 1. Soft water leaches glass more severely than hard water. This is because as the water has a low concentration of hardening metal ions, these can be more easily removed from the surface of the glass. 2. The higher the water temperature, the greater the corrosive effect. 3. The longer chemical, temperature, water and mechanical factors are allowed to act on glass unsuitable for dishwashing, the quicker corrosion will occur.
Technical Information Note The following can help to minimize the risk of glass corrosion: • Especially valuable glassware should be washed by hand. This also applies to glasses with gold rims or other decoration. • When purchasing new glasses, make sure that they are dishwasherproof. Usually there is an indication regarding their suitability for cleaning in a dishwasher. • Set the water softener correctly to match the on-site water hardness.
Technical Information 3.3 Silver Properties: Silver has many outstanding properties which include excellent heat conduction as well as being highly reflective, ductile and chemically resistant. Its conductivity makes silver cutlery particularly popular with gourmets. This is because silver cutlery does not affect taste perception as the cutlery warms to the same temperature as the food being consumed. The bacteria-killing property of silver is also particularly noteworthy.
Technical Information Machine dishwashing increases the tendency of silver to tarnish due to several factors: 1. Residues of foodstuffs containing sulphur have a relatively long time to affect the surface of silverware as dishwashing programs are usually only started when the dishwasher is full. 2. The high cleaning temperatures increase the reactivity of the silver and help speed up the tarnishing process. 3.
Technical Information Note Silver plate: Silver-plated items consist of a stainless-steel (18/8 or 18/10) or alloy (copper, nickel and zinc (nickel silver)) base material plated with a thin pure silver coating in a galvanic bath. Externally silver-plated and solid-silver items appear identical and it is virtually impossible to differentiate between them. The polishing and shine properties of both versions are also identical.
Technical Information Note After filling the salt container, salt residues should not be allowed to stay in the machine for a long period. It is recommended to flush them away using a short wash program (e.g. Short wash 100°F or Rinse & Hold). 2. Gap and contact corrosion occurs particularly where two parts of different materials contact each other (e.g. knife blade and handle).
Technical Information e. The surfaces of stainless-steel cooking utensils develop brown, blue and mother-of-pearl-like discoloration. This occurs when cooking various vegetables (cauliflower, celeriac, kohlrabi, mushrooms, potatoes, savoy cabbage) and fish due to the reaction of hydroxide ions (OH ions) with minerals (phosphor, silica and magnesium compounds). Such discoloration can be easily removed with a machine cleaner or scouring agent. 3.
Technical Information The following types of fine ceramics are suitable to a very limited extent for cleaning in a dishwasher: 1. Fine stoneware (porcelain) Light grey to white, sintered (maximum 3% water absorption), hard and resistant. Note To differentiate between stoneware and fine stoneware, tap the item carefully. A deep tone indicates stoneware or earthenware. A bright, higher tone indicates fine stoneware or porcelain. 2.
Technical Information 3.7 Porcelain Porcelain, the most revered fine ceramic material, consists of approx. 50% kaolin, 25% quartz and 25% felspar. These components are ground finely together and mixed with water to produce a moldable material. After molding, pieces are first dried and then fired at approx. 1650°F. After the application of glaze, they are fired again, this time at a higher temperature of approx. 2550°F.
Technical Information 3.8 Wood Wooden items, whether lacquered or not, are not suitable for washing in a dishwasher. Lacquered wood swells and as a result the lacquer peels off. Wooden cutting boards or items with unlacquered parts (e.g. cutlery with wooden handles) become bleached and rougher, and can develop cracks. 3.
Technical Information 3.10 Loading the dishwasher In contrast with laundry care where different items are pre-sorted depending on textile type, temperature and color and washed separately, it is generally expected that a dishwasher thoroughly cleans the most varying types of soiled items in one mixed load. One basic requirement for this, in addition to the selection of a suitable program appropriate to the level of soiling and type of load, is the correct loading of the dishwasher. Basic requirements: 1.
Technical Information Warning! Items soiled with sand, wax, lubricating grease or paint residues must not be washed in a dishwasher as these could damage the appliance. 5. Place lightly soiled and sensitive items in the upper basket and heavily soiled items in the bottom basket. 6. Small items such as lids should be placed in the cutlery drawer or cutlery basket. Such items could otherwise easily fall through the gaps in the baskets. 7.
Technical Information 4.0 Wash technology 4.1 Basics Four factors influence the cleaning results of washing in a dishwasher. These can be presented in a pie chart known as the Cleaning Circle: 1. Mechanical action: Spray pressure of water. 2. Chemical action: Composition of detergent.
Technical Information 4.2 Programs 1. Gentle and economy programs (104°F – 131°F): Lightly soiled or temperature sensitive dishes (e.g. glasses, coffee sets). 2. Normal and universal programs (122°F – 149°F): Normally soiled dishes with dried-on food residues and tea stains. 3. Intensive programs (158°F – 167°F): Normally soiled food preparation utensils and pots and pans with dried-on food residues. 4. Automatic programs: Sensors are used to register the degree of soiling and loading level.
Technical Information 6. Reactivation (4.5 Water softening and reactivation). 4.4 Drying Depending on model, Miele dishwashers utilize four different drying systems. 1. Evaporation drying: Drying occurs mostly using the residual heat retained in the dishes after rinsing. On models with tubular heating elements, the heating is also activated at intervals. 2. Recirculation evaporation drying (fully integrated models): Recirculation evaporation drying operates with the heat exchanger principle.
Technical Information 4. Recirculation turbothermic drying (from G 1xxx/G 2xxx on all model versions): Fig. 1 1 Inner fan channel 2 Outer fan channel 3 Fan Circulation Turbothermic drying (UTT) operates with two separate air paths: 1. Condensing circuit 2.
Technical Information Both paths flow past each other separated by two thin stainless-steel foils, which act as condensation surfaces. The steam condenser in the machine side wall has cool ambient air passed over it which speeds up the cooling of the moist warm air from the cabinet. This has the advantage that even with connection to a hot water supply, the drying performance is not impaired. 4.
Technical Information The reactivation of the softener and provision of soft water are automatically controlled by the dishwasher in various ways as follows: 1. Time-controlled reactivation (models with time-controlled water intake): Using a multistage selector switch, the customer can set the machine to suit the hardness of the on-site water supply (the local water supply company can be requested to provide information regarding water hardness).
Technical Information 5.0 Fault Repair 5.1 Generally poor washing results Cause Incorrect dispensing. Remedy 11.1. Check the manufacturer's instructions regarding dispensing. Cause Incorrect program selection. Remedy 1. Select a program with longer running time (and higher temperature). Cause Machine overloaded. Remedy 1. Reduce the load in the cabinet. Cause Insufficient reactivation salt. Remedy 1. Refill the reactivation salt container. Cause Dispenser blocked by item in the load. Remedy 1.
Technical Information Cause Spray arms clogged. Remedy 1. Clean the spray arms with a suitable machine care product. Cause Filter combination clogged. Remedy 11.1 Remove the filter combination and clean it. Cause Dispenser unit defective. Remedy 11. Exchange the dispenser unit. Cause Spray arms defective. Remedy 1. Exchange the spray arms. Cause Drain pump defective. Remedy 1. Exchange the drain pump.
Technical Information Cause Heating defective. Remedy 1. Exchange the heating. 5.2 Grainy or sand-like residues Grainy or sand-like deposits are food residues that have been cleaned from the load but have then been redeposited on items. Cause Dirty filter combination. Remedy 1. Clean the filter combination. Cause Spray arms clogged. Remedy 1. Remove any blockages (see the operating instructions). 2. Clean the spray arms with a suitable machine care product. 3.
Technical Information Cause Water path blocked by foreign body. Remedy 1. Clean the dishwasher with a suitable machine care product. Cause Water level too low. Remedy 11. Check the on-site water supply. 2. Clean water inlet filter. 3. Refer to service manual for further troubleshooting steps. 5.3 Dull deposits Dull deposits are starch residues (from casseroles, potatoes, sauces, legumes, flour, etc.). Cause Insufficient detergent dispensed. Remedy 1. Increase the dispensed quantity.
Technical Information Cause Excessive quantities of starchy food residues have been left on items. Remedy 1. Scrape off food residues more thoroughly before placing items in the dishwasher. 5.4 Items not bright or shiny A lack of brightness is usually the result of calcareous deposits or water stains and stripes. Remove deposits with vinegar or citric acid. Cause Insufficient rinse aid dispensing. Remedy 1. Increase the quantity of rinse aid dispensed. Cause Insufficient water softening. Remedy 1.
Technical Information 11. Use a detergent with greater bleaching properties. 5.6 Lipstick stains Cause Lipstick stains consist of a wax material with color pigments. The wax is melted and removed during a normal wash cycle but the colored pigments may be more difficult to remove. Remedy 1. Increase the quantity of detergent dispensed. To remove marks from glass surfaces, the detergent should contain a dispersing agent such as phosphate. 5.
Technical Information Cause Wash program too short. Remedy 1. Select a dishwashing program to suit the level of soiling of the load. Cause Insufficient detergent dispensed. Remedy 1. Increase the dispensed quantity. 5.9 Excess foam development Cause Operating fault. Remedy 1. Check the detergent and dispensing levels. 2. Check the machine settings: Rinse aid dispensing, Tab button pressed, etc. 3. Follow the instructions given in the operating instructions.
Technical Information 5.10 Odor development Cause Dishwasher installed incorrectly. The drain water hose has been connected to the on-site drain on the wrong side of the U-bend odor trap. Remedy 1. Check the drain connection and modify if necessary. Cause Drain hose is kinked or not laid in accordance with the operating instructions. Remedy 1. Check how the drain hose is laid and modify if necessary. Cause Insufficient detergent dispensed. Remedy 1. Increase the dispensed quantity.
Technical Information Cause Glass corrosion. If glasses smell musty, this may be a sign of glass corrosion. Remedy 1. As glass corrosion cannot be treated, the glasses must be disposed of. 5.11 Salt residues Cause The salt container is not correctly closed. Remedy 1. Close the salt container cap properly. Cause Hairline crack in the salt container cap. Remedy 1. Exchange the salt container cap. Cause Salt spilled during filling. Remedy 1. Run a short program.
Technical Information 5.12 Calcareous deposits in the cabinet Cause No salt present. Remedy 1. Reactivate the water softener with reactivation salt. Cause Incorrect water hardness level set. Remedy 1. Set the water hardness correctly to suit the on-site water supply. Cause Fault in water inlet system. Remedy 1. Run a program with the maximum temperature step (if necessary with a suitable machine care product, see 2.5 Machine care products). 5.13 Residues in cabinet Cause Insufficient detergent dispensed.
Technical Information Note Run a program with the maximum temperature step (if necessary with a suitable machine care product, see 2.5 Machine care products). 5.14 Wearing out of rubber parts Wearing out of rubber parts (e.g. the connection hose, Mat. no. 5229350) on models from G 3XX, G 6XX, G 8XX series. Cause Residues of cold-pressed vegetable oil. Remedy 1. Advise affected customers of the cause of this problem. 5.
Technical Information 5.16 Dishes not properly dry Cause Rinse aid missing. Remedy 1. Fill the rinse aid container. Cause The Tab button has been pressed but standard detergent is being used. Remedy 1. Use a combination product or deactivate the Tab button and use standard detergent. Cause A combination product (2 in 1 or 3 in 1) is being used that has insufficient drying capacity. Remedy 1. Change the brand of combination product. 2. Use standard detergent and rinse aid.
