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Dishwasher Maintenance

To maintain the efficiency, safety, and useful life of your dishwasher, it is important that your home maintenance program include the proper maintenance for your dishwasher.

An automatic dishwasher operates by using an electric heating element to heat water at the bottom of the dishwasher, then using rotating spray arms to create jets of water which swirl around the dishes to dislodge the food and grease.  Any obstruction of the water's flow greatly reduces the dishwasher's washing efficiency.

Shown below are the two recommended routine maintenance tasks for your dishwasher.  

Learn to enjoy managing your home with our free Newsletter or our free Automatic Maintenance Reminders.  We can also show you the Recommended Maintenance Schedules for your entire home.

     

 

 
 

 

 

 Maintenance Task #1Treat for scale build-up

 
       
    How do you treat a dishwasher for scale build-up?  

 

 

Over time, a heavy film build-up from hard water minerals can become deposited on the inside walls and heating element of the dishwasher.  After removing all of dishes, pans, silverware etc. and with no detergent in your dishwasher, the following should be done to remove the type of scale shown:

  • Mold:  Place one tablespoon of bleach in your dishwasher and then run it for a full cycle.

  • Rust:  Place about half of a small container of Tang brand orange-flavored drink mix and then run it for a regular cycle.  The citric acid in the Tang helps to loosen hard water deposits and cleans the scale from your dishwasher.

  • Stains:  Place a cupful of white vinegar in your dishwasher and then run it for a full cycle.  An alternative to vinegar is baking soda.

 
       
    Why is it important to treat a dishwasher for scale build-up?  

 

 

Removing the deposits improves the efficiency of the heating element and improves the appearance of the inside tub.

 
       
    How often should you treat a dishwasher for scale build-up?  
    The dishwasher should be treated for scale build-up every two months.  

 

 

 

   
    How does Home-Wizard rate the costs and benefits for this task?  
    The cost of this task is low.  It is estimated that this task should only take about 30 minutes to complete, and the task is relatively easy to do.  No specialized tools are required, but you will need to have bleach, Tang brand beverage mix, and either vinegar or baking soda on hand.  
         
    The benefits of this task are moderate.  Doing this task can help maintain the performance of your dishwasher, and extend its useful life.  
       
    Overall Home-Wizard benefit-versus-cost rating (one 'hat' = low and four 'hats' = high)  

 

 

 

 

 

 Maintenance Task #2Perform annual maintenance

 
       
    How do you perform annual dishwasher maintenance?  

 

 

Annual dishwasher maintenance consists of 5 tasks:

  1. Clean filter and trap: Inside the dishwasher, the filter and trap are at the bottom where the water drains out.  For most models, the filter and trap lift out so that they can be cleaned with a stiff brush.

  2. Clear spray arm holes: Food particle or mineral deposits can clog the hole in the spray arms.  Take the spray arms out of the dishwasher, and ream the holes out with a stiff wire.  Shake out any loose debris.

  3. Clear the "air trap": Some models have a gap in the discharge plumbing to ensure that water does not backflow into the household water supply.  If the unit has an air gap it should be checked and cleaned.

  4. Check and tighten any loose water hose clamps.

  5. Check the door seal gasket for any cracks or leaks.

  6. Check the pre-heating mechanism:  If your dishwasher has a pre-heating mechanism for when inlet water is too cold, this should be checked in accordance with your manufacturer's recommendations.

 
       
    Why is it important to perform annual dishwasher maintenance?  

 

 

Annual maintenance improves the operating effectiveness of the dishwasher.  Which means that it will do a better job of cleaning your dishes.

 
       
    How often should you perform dishwasher maintenance?  
    Dishwasher maintenance should be conducted on an annual basis (February).  

 

 

 

   
    How does Home-Wizard rate the costs and benefits for this task?  
    The cost of this task is moderate.  It is estimated that this task should take about an hour to complete.  You will need a cleaning brush, a stiff wire, and a screwdriver to complete this task.  
         
    The benefits of this task are moderately high.  Doing this task can help prevent damage from water leaks, maintains the performance of your water heater, and help extend its useful life.  
       
    Overall Home-Wizard benefit-versus-cost rating (one 'hat' = low and four 'hats' = high)  

 

 

 

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QUESTIONS & ANSWERS from "Ask-the-Wizard":

QUESTION from "Phil"

How do I remove rust forming on the sliding dish basket of an automatic dishwasher?

ANSWER:

Phil:

One question that I would have for you is whether you are seeing rust just on the sliding dish basket, or are you also seeing a rust-like film on the inside walls as well (it would look like a light brown staining on the walls)?

But assuming that the rust film is there, but it is just alot worse on the sliding dish basket, then the cure for this is citric acid. You can buy special packets of citric acid for your dishwasher, but believe it or not, what will work just as well is to use 'Tang' Breakfast Drink (that comes as an orange powder). Just fill both dishwasher cups with Tang Breakfast Drink powder, and then run your dishwasher through the normal cycle. If rust is really bad, then several treatments may be required. One hint though is to first run the hot water in the sink until it gets very hot, and then turn on your dishwasher. This ensures that your dishwasher starts with hot water.

Hope this is helpful.
Home-Wizard.com

____________________

QUESTION from "Mare"

How do I clean melted plastic (Nalgene cap) from the heating element? Do I have to replace the element?

ANSWER:

Mare:

I assume that you are referring to the heating element of your dishwasher, where you were washing your Nalgene bottle and that somehow the plastic cap came in contact with the heating element.

Here is something that you can try, that will hopefully work for you. First, remove all of your dishes, etc. from your dishwasher. Then scrape off all of the plastic that has melted onto the heating element. Be sure to remove it from the underside of the element as well. Try to get all of the plastic off that you possibly can scrape off. Next pour about a half gallon of white vinegar into the bottom of your dishwasher so that it completely covers the heating element. Let the dishwasher sit like this for a day if you can, or at least overnight. Then turn on your dishwasher and let it run with the vinegar in it (but still with no dishes in it). Then run it again with nothing in it.

Hopefully this will remove what little plastic residue that might have been left on the heating element, and also gets rid of the burning plastic (and vinegar) smell from your dishwasher.

Home-Wizard.com

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QUESTION from "Trevor"

When the dishwasher is turned on, the light comes on, but nothing happens.

ANSWER:

Trevor:

Since the light is coming on, it appears that you have power coming to your dishwasher (or power at least to the light).

A simple thing that you can do, which most of the time will solve your problem, is to pour a large pot of regular tap water into the inside bottom of the dishwasher. You then close the door and turn your dishwasher on. Hopefully, your dishwasher should then start and run normally.

The reason that this will work most of the time, is that if you haven’t been using your dishwasher for a little while, the water at the bottom of your dishwasher dries out, and the pump loses its “prime”. When you pour the water into the bottom of your dishwasher, it primes the pump.

When you are done, you might want to pour a little vinegar in the water, which will help act as lubricant to the rubber seal around the pump shaft, to help prevent problems in the future.

If this doesn’t work for you, please let us know, and we can try other things to troubleshoot your problems.

Hope this is helpful.

Home-Wizard.com

____________________

QUESTION from "liyarb"

Dishwasher keeps getting mildew in bottom of disherwasher where it drains. what can i do to stop this?

ANSWER:

liyarb:

If you are getting mildew forming around the drain of your dishwasher, then there is moisture collecting at the bottom of your dishwasher.

This could be caused either by your dishwasher not pumping out all of the moisture completely, or it could because you are adding moisture by placing rinsed dishes in your dishwasher and the water is dripping down to the bottom.

A couple of other things that you can check are whether the drain area is partially plugged with food residue (leaving a ridge where moisture can puddle), or whether the water in your dishwasher is hot enough to dissolve the detergent that could cake up and also partially block the drain.

Lastly, are you allowing the heat cycle to dry your dishes after running, or are you trying to save energy by air drying, which is not drying out the dishwasher and allowing the standing moisture to create mold at the bottom?

Hope this is helpful.

Home-Wizard.com

____________________

QUESTION from "Hope"

Yesterday, for the first time, my dishwasher did not completely drain.  There was about 3 to 4 inches of water.  Can you tell me why?

ANSWER:

Hope:

When a dishwasher has gone through it cycle, finding a small pool of clean water at the bottom of the tub is fairly typical. But if you are finding excessive amounts of water, then something isn’t working correctly. Some things that could be causing this problem include:

DRAIN LINE: Sometimes the drain line can get clogged where the drain line from the dishwasher meets the household drain line. You can disconnect the line and clean it out to remove the clog.

GARBAGE DISPOSAL: Sometimes when the dishwasher doesn’t drain all the way, the problem turns out to be related to the garbage disposal (if you have one). You can check the connection where the dishwasher line drains into the garbage disposal, and if it is plugged, then clean it out. Also, be sure that you garbage disposal is operating and draining properly.

STRAINER: Depending on the design of your particular dishwasher, the strainer at the bottom of your dishwasher may be plugged. To check this, turn off the power to your dishwasher and let the unit cool down. Then, depending on the design, remove the strainer (that could be located under the bottom spray arm), and carefully scrub it clean with a brush.

DRAIN VALVE / SOLENOID: Many dishwashers use an electrically controlled valve to open and close flow to the drain. If this valve is sticking or otherwise not operating properly, it could be causing water to pool at the bottom of your unit.

PUMP: The pump that forces the water into your dishwasher also can pump water out of your dishwasher, depending on your unit’s particular design. If the pump isn’t working properly, this could be the cause of your problem.

MOTOR: If the motor that drives your pump isn’t working properly or not getting power, it could be causing your water pooling problem.

TIMER: And lastly, ever once in a while, a water pooling problem can be caused if the timer on your unit isn’t operating properly, and not enabling it to drain at the proper time in the cycle.

As always, be sure that the power to your dishwasher and garbage disposal is disconnected before doing any work on them.

Hope this is helpful.
Home-Wizard.com
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QUESTION from "Donna"

Our GFI keeps popping when we run the dishwasher - but we've had it for 8 years and have not relocated any other items.  It won't pop if we run on a low energy cycle - but if we run it on normal it pops.

ANSWER:

Donna:

Regarding your GFI tripping off when you run your dishwasher on its normal energy cycle but not on the low energy cycle, it could be a couple of things happening:

1) as GFIs ("ground fault interrupters") get older over time, they sometimes begin to trip at lower power levels. So in other words, it may have been fine operating at let's say 20 amps for years, but now it trips at 18 amps as the GFI has worn out.

2) Your dishwasher may be exeriencing a power surge when the heater for your dishwasher's normal power kicks on, and this is what is tripping your GFI.

Either way, you probably want a qualified electrician to test your GFI and dishwasher.

Hope this is helpful.
Home-Wizard.com
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QUESTION from "aldoanddiane"

Is there a product on the market that you can use to refinish diswasher baskets? They have rust on the plastic.

ANSWER:

Dear aldoanddiane:

You may not need to actually refinish your dishwasher baskets, but rather, it could be that you just need to remove the rust scale from them.

If you go to the Dishwasher page of our online home Maintenance Library, under Maintenance Task #1 we describe how to use "Tang" brand orange drink to remove rust scale from your dishwasher baskets: http://www.home-wizard.com/maintenance/dishwasher.asp

Hopefully this will work for you. If not, just let us know.
Home-Wizard.com
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ADDITIONAL COMMENT from "aldoanddiane"

Thanks for your reply, but the dishwasher baskets are in need of re-coating the rubberized plastic on the baskets.  I need to clean the rusted area and then re do with a plastic coating.   Is there such a product out there?  I have not been able to find one. Thanks aldo.

ANSWER:

Dear aldoanddiane:

I see. It's not rust scale on the coating of the basket, but rather its that the plastic has deteriorated, and its the metal frame below the plastic that is showing through, and this is what has rusted. Right?

In a case like this, I would suggest that you contact the manufacturer of the your dishwasher (just do a Google search on the brand name, and they should have an "800" number for customer service). And ask them what they recommend for your dishwasher. It will need to be something that is obviously water-proof, but it will also need to be able to withstand high temperatures. Maybe if they are nice, they will even send you a replacement basket, or at least have a reasonable price for replacements.

If this doesn't help, just let us know, and maybe we can come up with something else to help you.

Regards,
Home-Wizard.com
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Maintenance Library index
Air Conditioning (central) Foundation Program Thermostats
Air Conditioning (room unit) Freezer Radiators
Attic Furnace Refrigerator
Automatic Lawn Sprinklers Furniture (Fine Wood) Roof
Barbeque Grill Furniture (Leather) Roof Gutters
Baseboard Heating System Furniture (Upholstered) Safety Tips
Basement Garage Security System
Brick Siding Garbage Disposal Septic System
Carpets Garbage Rates Showers & Tubs
Ceiling Fan Gas Fireplace Smoke Detectors
Charity Goods Donation Heat Pump Storm Windows
Clothes Dryer Holiday Lighting Stove
CO Detectors Hot Tub Spa Sump Pump
Daylight Savings Time Humidifier Swimming Pool
Decking Insurance Rates Tax Assessment
Dehumidifier Large Trees Nearby Telephone Service Rates
Dishwasher Lawn Trash Compactor
Drapes and Blinds Locks & Hinges Utility Meter Verification
Driveway Marble Floors Vinyl Siding
Electric Air Cleaner Mattresses Washing Machine
Electric Shaver Medicines (expired) Water Beds
Electrical Ground Faults Microwave Oven Water Heater
Emergency Supplies Mortgage Rates Weatherstripping
Energy Audits Outside Lighting Well Water
Energy Rates Outside Water Faucets Windows
Energy Savings Tips Oven Window Screens
Exhaust Fans Patio Furniture Wood Siding
Fire Extinguishers Personal Computer Wood Stove
Fireplace Pest Control Wooden Floors
Forced Air Heating System Plumbing  

Terms of Use
Copyright © 2000-6 Boston Digital LLC. All rights reserved.
our particular dishwasher, the strainer at the bottom of your dishwasher may be plugged. To check this, turn off the power to your dishwasher and let the unit cool down. Then, depending on the design, remove the strainer (that could be located under the bottom spray arm), and carefully scrub it clean with a brush.

DRAIN VALVE / SOLENOID: Many dishwashers use an electrically controlled valve to open and close flow to the drain. If this valve is sticking or otherwise not operating properly, it could be causing water to pool at the bottom of your unit.

PUMP: The pump that forces the water into your dishwasher also can pump water out of your dishwasher, depending on your unit’s particular design. If the pump isn’t working properly, this could be the cause of your problem.

MOTOR: If the motor that drives your pump isn’t working properly or not getting power, it could be causing your water pooling problem.

TIMER: And lastly, ever once in a while, a water pooling problem can be caused if the timer on your unit isn’t operating properly, and not enabling it to drain at the proper time in the cycle.

As always, be sure that the power to your dishwasher and garbage disposal is disconnected before doing any work on them.

Hope this is helpful.
Home-Wizard.com
____________________
QUESTION from Frannie on 4/13/2008:

is dishwasher detergent an acid a base or neutral?

ANSWER FROM HOME-WIZARD.COM ON 4/13/2008:

Dear Frannie:

Most detergents are bases.

Here's a link to a page from Vanderbilt University that describes how you test whether something is an acid, base or neutral:

http://studentorgs.vanderbilt.edu/vsvs/New%20VSVS%20Site/Web%20Lessons%202006/Acids%20and%20Bases/for%20web/Acids%20and%20Bases.pdf

Hope this is helpful.
Home-Wizard.com
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QUESTION from nemreh313 on 4/8/2008:


where does one find Tang these days? i thought it was removed from the market due to cancer causing food additives and havent seen it for a long time. can you tell me of an alternative? Kool-aid? or a lemonade mix?

ANSWER FROM HOME-WIZARD.COM ON 4/8/2008:

Dear nemreh313:

I assume that you are using the Tang to clean rust stains out of your dishwasher.

And yes, the good news is that it is still on the market. For example, here is a link to where you can buy it online from Amazon.com (not an endorsement of Amazon.com, just giving an example):

http://www.amazon.com/gp/aw/d.html/105-3190927-8233263?ie=UTF8&a=B000FIDJLY

Hope this is helpful.
Home-Wizard.com
____________________
QUESTION from GLS on 4/1/2008:

The disposal and dishwasher were already installed in my home so I'm not familiar with the applicances or the install, but sometimes when running my disposal, water backs up into my dishwasher - what's up with that.

ANSWER FROM HOME-WIZARD.COM ON 4/1/2008:

Dear GLS:

Does your sink seem to be draining fine? If not, you should check to see if the drain pipe has gotten plugged, and treat it accordingly (for example, using a product such as Drano).

But if your drain seems clear, then the next thing to check is whether the house you moved into has a dishwasher drain air-gap installed.

A dishwasher drain air-gap helps to ensure proper water drainage without allowing water to siphon back into the dishwasher. It is actually required by building codes in some regions of the country.

Hope this is helpful.
Home-Wizard.com
____________________
QUESTION from Eduardo on 4/1/2008:

when troubleshooting the washer and the washer fails to fill with water you have already checked water pump for proper operation and the water pump is operational, what is you next step in this procedure?

ANSWER FROM HOME-WIZARD.COM ON 4/1/2008:

Dear Eduardo:

There are two power-activated electronic valves in your washing machine, one for cold water and one for hot water. When your washing machine goes through it cycles, depending on what settings you are using, these valves receive power to them at the appropriate time in the cycle to open and close. In other words, when they receive power, these electronic valves open up to allow either hot or cold water to flow into your washer.

Since you are not getting water to your washer, here are some things that you can check:

1) Close the valves to the water hoses that go to your washer, then disconnect the water hoses from the washer. Then, with a bucket under the hose, open the valve to see if water comes out of the hose. Repeat for the other hose.

2) Check where the hose connects to the washer and see if the screen that is inside of the fitting where the hose connects to washer is plugged up. Be very careful if you are trying to clean out this screen, as with some model washers, this screen can be very difficult to replace.

3) If this inlet screen is clear, then the next thing to check is the electronic valve that controls the hot water (often called a "solenoid" valve). Testing the solenoid valves for your washer is probably something that you want to ask a professional to do for you. To do it yourself you will need to unplug the power cord from the wall, get a owner's manual, and then use a multitester meter to see if the solenoid valve is reading the proper amount across the terminals of the valve (although if it reads 'infinity', then the valve is bad). But again, testing a solenoid valve on your washing machine is something that you should ask a professional to do. 

Hopefully, it will turn out to be just a plugged screen.

Hope this is helpful for you.
Home-Wizard.com
____________________
QUESTION from rbyford on 3/16/2008:

When I run our dishwasher I hear a high-pitched buzzing sound while it's running. Also, the soap dispenser doesn't seem to be working right and the dishes are not getting clean. It's in good shape inside but is 13 years old.

ANSWER FROM HOME-WIZARD.COM ON 3/16/2008:

Dear rbyford:

It sounds like you dishwasher has some debris caught in the pump assembly. This could explain both the high-pitched noise and your unit's poor cleaning performance.

Depending on your particular model, you (or a trained technician would have to pull out the dishwasher from its installation and disassemble the lower spray arm section to check for debris in the pump.

Hope this is helpful.
Home-Wizard.com
____________________
QUESTION from cheermomlm on 3/2/2008:

Why is water pouring from the dishwasher vent into the sink?

ANSWER FROM HOME-WIZARD.COM ON 3/2/2008:

Dear cheermomlm:

If you have water pouring out of your dishwasher air vent into the sink, then it sounds like you have a blockage in your dishwasher’s waste water discharge line. And as a result, the water travels back up through your air vent.

If you look under your sink you should see a hose coming from the dishwasher that is split into two hoses by a “Y” fitting. One part of the split leads to the drain and the other goes up to the air vent connection at the rear of your sink. When your dishwasher drains, an electric pump in the bottom of your dishwasher pushes the waste water from your dishwasher to the drain. If a blockage gets formed in the line between the drain under your sink and this “Y” fitting, then when your dishwasher tries to push the water to the drain, it can’t go this route, so it instead get pushed up the other branch of the “Y”, which is the hose that goes to your air vent. 

The blockage in the line to your drain is typically caused by grease build-up. To clean this out, you will need to disconnect the hose that goes to your drain, and clear out the blockage using something like a bottle brush.

Hope this helpful.
Home-Wizard.com
____________________
QUESTION from ndlady45 on 2/16/2008:

Water will not come into my Kenmore Ultra Wash dishwasher. All faucets are turned on. It will come in the side hole but not thru the arms. HELP ME!!!!!

ANSWER FROM HOME-WIZARD.COM ON 2/16/2008:

Dear ndlady45: 

It sounds like your dishwasher arm may have gotten clogged. 

If this is it, there are a couple of things that could have caused your spray arm to become plugged: 

- debris 
- lime crystals 


To clear out your arm, you will first need to remove the arm. The arm is usually held by a nut, which you can remove by holding the arm and turning the nut counter-clockwise. After you have removed the arm, shake it to see if you can get the obstruction (broken glass, pieces of food, etc.) to come out. 

If you notice white lime crystals clogging the holes in the arm, put some rubber gloves and some safety eye glasses on, and then you can try using an old toothbrush and undiluted white vinegar to clear out the holes. If this doesn’t work, then you might want to try a strong acidic cleaner like “CLR”. If you are seeing lime crystals building up, then this is a sign that you have hard water, and may need to consider using a water softener. 

Home this is helpful. 
Home-Wizard.com
____________________
Maintenance Library index

Air Conditioning (central) Foundation Program Thermostats
Air Conditioning (room unit) Freezer Radiators
Attic Furnace Refrigerator
Automatic Lawn Sprinklers Furniture (Fine Wood) Roof
Barbeque Grill Furniture (Leather) Roof Gutters
Baseboard Heating System Furniture (Upholstered) Safety Tips
Basement Garage Security System
Brick Siding Garbage Disposal Septic System
Carpets Garbage Rates Showers & Tubs
Ceiling Fan Gas Fireplace Smoke Detectors
Charity Goods Donation Heat Pump Storm Windows
Clothes Dryer Holiday Lighting Stove
CO Detectors Hot Tub Spa Sump Pump
Daylight Savings Time Humidifier Swimming Pool
Decking Insurance Rates Tax Assessment
Dehumidifier Large Trees Nearby Telephone Service Rates
Dishwasher Lawn Trash Compactor
Drapes and Blinds Locks & Hinges Utility Meter Verification
Driveway Marble Floors Vinyl Siding
Electric Air Cleaner Mattresses Washing Machine
Electric Shaver Medicines (expired) Water Beds
Electrical Ground Faults Microwave Oven Water Heater
Emergency Supplies Mortgage Rates Weatherstripping
Energy Audits Outside Lighting Well Water
Energy Rates Outside Water Faucets Windows
Energy Savings Tips Oven Window Screens
Exhaust Fans Patio Furniture Wood Siding
Fire Extinguishers Personal Computer Wood Stove
Fireplace Pest Control Wooden Floors
Forced Air Heating System Plumbing  

Terms of Use
Copyright © 2000-6 Boston Digital LLC. All rights reserved.