Bosch SHU5315UC Dishwasher Logo
Posted on Jan 26, 2009
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Not cleaning dishes

Our Bosch dishwasher, model shu531uc is not cleaning dishes properly. We think there may be a problem with the dish detergent dispenser. There is often food and grime left on dishes.

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  • Posted on Jan 26, 2009
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Our Bosch does a pretty good job of washing dishes. But we rinse most of the time. Not a hard rinse, but a rinse.

Are both spray bars rotating? You can test by seeing that the bars rotate easily by hand, and also by starting a cycle and opening the door real quick when you hear the spray hit the door.

Make sure the spray bar nozzles are all clear.

Has it ever done a good job of cleaning dishes?

DI you leave a heavy build-up of food on the dishes, and allow it to dry before washing?

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Rinse solution on Fisher&Paykel dish washer not being used

Problem Possible Cause What to do Dishwasher will not start. No power. Ensure the dishwasher is plugged in and the power supply is turned on at the wall. The door is not properly closed. Close the door. Start/Pause button has not been pressed. Press the Start/Pause button . Water tap not turned on. Ensure water is connected and turned on. Blocked strainer in water inlet hose. Check the strainer and clean if necessary-it is located where the water inlet hose screws into the tap. Keylock is activated. Cancel Keylock by pressing and holding until the keylock indicator goes out. Lower spray arm rotates with difficulty. Spray arm holes are blocked by small items or food particles. Clean the spray arm. See 'Care and cleaning' for instructions. Cover of detergent dispenser cannot be closed. Detergent compartment has been overfilled. Remove detergent until the cover can be closed. Detergent dispenser is clogged with remnants of detergent. Wipe dispenser out with a damp cloth. Dry the dispenser before adding detergent. Remnants of detergent stuck inside dispenser. Compartment was damp when filled with detergent. Wipe dispenser out with a damp cloth. Dry the dispenser before adding detergent. Buttons beep and do not respond. Keylock is activated. Cancel Keylock by pressing and holding until the keylock indicator goes out. Water remains inside dishwasher after wash has ended. Drain hose is crimped, bent, or blocked. Check the drain hose and straighten if needed. Pump is jammed. Call your Fisher & Paykel Authorised Service Centre or Customer Care. Filter(s) blocked. Clean the filter(s). See 'Care and cleaning' for instructions. Foaming. Incorrect amount or type of detergent used. See section 'Adding detergent' or consult the detergent manufacturer's instructions. Too much egg in the wash load. Increase the amount of detergent. Rinse aid dosage level too high. Decrease the rinse aid dosage. Rinse aid spills not wiped up. Ensure that all rinse aid spills are wiped up when they occur. Water tap not turned on. Ensure water is connected and turned on. The dishwasher stops suddenly during the wash. Power or water supply has been interrupted. Check the power and water supplies. Knocking or rattling sound during wash. Spray arm knocking against dishes. Pause the wash and rearrange dishes. See sections 'CH and CHP models - Controls and starting a wash' or 'CK models - Controls and starting a wash', and 'Loading'. Dishes have been stacked incorrectly. Unclean dishes. Wash programme unsuitable for load. See section 'Wash programmes and detergent quantities' and select a suitable programme. Soils were too heavily baked on. Dishes may need soaking. Spray arm(s) unable to rotate. Ensure no items are obstructing the spray arm path. Dishwasher overloaded or incorrectly loaded. See the 'Loading' section. The filters are incorrectly inserted. See section 'Care and cleaning'. Detergent put in the wrong compartment. See sections 'Wash programmes and detergent quantities' and 'Adding detergent'. Excessive food not removed from dishes before loading. Scrape all food scraps off dishes before loading. Unsuitable detergent. Only use powdered or tablet detergent designed for domestic dishwashers. Not enough detergent. See 'Wash programmes and detergent quantities' for recommended quantities. You may need to adjust these to suit your particular load and the hardness of your water supply. Spray arm holes are blocked. Clean the spray arm(s). See 'Care and cleaning' for instructions. The filters are blocked. Clean the filters. See 'Care and cleaning' for instructions. Plastic items are discoloured (e.g. stain left by tomato sauce). Not enough detergent, not pre-rinsed. Pre-rinse plastic dishes before placing in the dishwasher and/or add more detergent. Alternatively, using the Rinse programme after adding dishes may minimise staining. Display flashing while Keylock is on. This is normal. The display remains on although the buttons are disabled. No action required. White stains are left on dishes; glasses have a milky appearance. Not enough detergent. See section 'Wash programmes and detergent quantities' for recommended quantities. You may need to adjust these to suit the hardness of your water supply. Rinse aid dosage too low. Increase rinse aid dosage. See 'Using rinse aid'. Dishes, cutlery have not dried. Rinse aid dosage too low. Increase rinse aid dosage. See 'Using rinse aid'. Items removed too soon. After the end of the wash programme, leave the door ajar and wait for several minutes to help drying. Rinse aid dispenser empty. (The rinse aid indicators are lit.) Add rinse aid. See section 'Using rinse aid' for instructions. Glasses have dull appearance. Rinse aid dosage too low. Increase rinse aid dosage. See 'Using rinse aid'. Tea stains or traces of lipstick have not been completely removed. Not enough detergent. See section 'Wash programmes and detergent quantities' for recommended quantities. You may need to adjust these to suit your particular load. Wash temperature too low. Select a wash programme with a higher temperature (see section 'Wash programme data' for information). Traces of rust on cutlery. Cutlery is not sufficiently rustproof. Wash by hand. Glasses clouded and discoloured; milky coating Hard water situation. Increase detergent quantities. Glasses are not dishwasher proof. Wash by hand. Water marks left on glasses and cutlery. Rinse aid level or dosage setting is too low. Ensure there is rinse aid in dispenser. If necessary, increase the rinse aid setting or try using a wash programme with a higher temperature. See sections 'Using rinse aid' and 'Wash programme data'.
Nov 12, 2018 • Dishwashers
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Dishwasher not cleaning dishes

DISHWASHER NOT CLEANING WELL??
Here are 5 common reasons why not.
Here are Improper Water Temperature
I can tell you from personal experience that water temperature has a direct impact on how well your family's dishwasher operates. If the water entering your dishwasher is not hot enough, your dishes are likely to come out coated with grease and dish detergent residue. As such, you will want to make sure that the temperature of the water inside your dishwasher is somewhere between the range of 120 degrees Fahrenheit and 140 degrees Fahrenheit. If it's not it could be a faulty heating element.
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Based on my experience, a dirty dishwasher pump will also cause your dishwasher to produce less than stellar results. Therefore, you may want to consider cleaning your dishwasher's pump every six months. In many instances, it is an easy task to complete. In order to clean your dishwasher's pump, you'll most likely have to remove the dishwasher's spray arms. Once the spray arms are removed, you'll want to clean and inspect the pump's impellers, blades and pump guard. I should also mention that there are appliance companies that sell dishwasher pump repair kits should you notice that a part needs to be replaced. A basic dishwasher pump repair kit will tend to cost you $20 to $60 depending on your dishwasher's unique needs.
Dirty Spray Arm
Dirty spray arms may also be to blame. After all, if the spray arms' holes are clogged, the hot water won't be able to reach the dishes properly. A dishwasher's spray arms are very simple to clean. In order to clean them, you will need an old toothbrush and a bread twist tie that has been stripped of its paper. Use the toothbrush's bristles and the wire from the bread twist tie to unclog all the holes.
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A broken dish detergent dispenser is another likely culprit when it comes to dish cleanliness problems. Sometimes the dish detergent dispenser's door will not open or shut properly, which prevents the dishes from getting nice and soapy. The good news is that most dish detergent dispenser problems may be solved relatively inexpensively. The cost of a replacement dish detergent dispenser will vary based on the make and model of your dishwasher. There are also instructional videos online that will help you with the installation of your dishwasher's new detergent dispenser.
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A filter has an impact on a dishwasher's effectiveness as well. Hence, you will want to inspect your dishwasher's filter for obstructions. The location and type of filter will vary based on your dishwasher's make and model. I would recommend that you check out your dishwasher's operator's manual. It should contain instructions on how to clean your particular unit's filter as well as where you can order a replacement part if need be.
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    After you have cleaned the detergent buildup from the inside of your dishwasher, follow the steps below to keep the buildup from happening again and to help your dishes rinse cleanly and prevent residue from accumulating on the dishes.
  4. Gel dishwasher detergent
    Switch to a liquid or gel dishwasher detergent. Any brand will do.
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The scum, film and white residue problems have started since the reduction of phosphates in dishwasher detergents.

Here is a tip that will help you to solve the problem of films, residue, and scum in your dishwasher.

Dishwasher Residue and Film on Dishes

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hi there,

sounds like the detergent dispenser is not working properly.

are the rest of your dishes clean? in other words, is there any food residue on them?

check the dispenser and make sure that there is nothing visibly wrong with it.

if the problem still persists, replace the dispenser.
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