Understanding the Cycles of a Dishwasher | Ask This Old House

Ask This Old House plumbing and heating expert Richard Trethewey takes host Kevin O’Connor inside a dishwasher to explain each cycle.
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Steps:
1. A dishwasher begins the cycle by running a discharge pump to empty any remaining liquid in the machine.
2. Next, hot water enters from the side and fills a reservoir at the bottom until it activates a float. In some cycles, an electrical element can heat the water to sanitize dishes.
3. Once the reservoir is filled, a pump sprays water and soap all over the dishes.
4. At the end of the cycle, the pump will discharge water out of the drain.
5. The number of cycles is determined by user settings.

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we’re ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O’Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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Understanding the Cycles of a Dishwasher | Ask This Old House
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sanny goldman

View Comments

  • Your are wrong!!! Float doesn't trigger the water intake solenoid until water level is reached. GE dishwashers let flow water during 44 seconds before starting the washing cycle. Float is a security that triggers the solenoid ONLY if water level becomes too high.
    I'm having problems right now because pressure is to low and 44 seconds of water is not enough to clean the dishes well...

  • the heating element is usually just used on the drying cycle. not to heat the water.

  • The water hook up in europe is cold water . The machine does all of the heating of the water.

  • Why do people need videos like this? The stupidity is astounding. Who would put suds producing detergent in a dish washing machine

    The dishwasher he is showing as an example is a very cheap one

  • Thank You for showing us the inside of dishwasher and how it works!

  • I always wonder how does the rinse aid gets released no one has posted video on that.

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