Dish Washers
Dish Washers
How do dishwashers work?
Dish Washers have 5 main cycles.
The fill cycle
This cycle ironically typically starts by draining the standing water that the dishwasher keeps to protect the seals in its system.
The dishwasher then sends power to the solenoid in its water inlet valve to allow water to flow into the machine via your homes water pressure.
The Rinse Cycle
Either a timer or sensor will tell the control board the dishwasher is done with the fill cycle and the rinse cycle will begin.
The circulation motor will then be given power and your spray arms or water dispersion system will begin to run.
Most Washers begin heating water as soon as sufficient water is in the appliance.
Wash Cycle
Usually about 15 minutes into the cycle the soap dispenser will open causing the wash cycle to begin
This can be caused by heat and a wax motor , rotation of the spin arms, or a timer and solenoid.
Final Rinse Cycle
The soapy water is drained from the washing machine and fresh water is allowed to enter once more.
The circulation pump once more sends the water through the dispersion system.
Dry Cycle
If your washer has a heated dry cycle your heating element will warm up heating the air.
A vent may open due to a solenoid or wax motor if included in your model.
Often times, dishwashers will start their wash cycle by draining the standing water in the bottom of the dishwasher. The dishwasher will send power to the inlet valve and the homes water pressure will send water through the dishwashers inlet hose to it's tub.
Some Common problems
An inlet valve can experience various problems.
In area with hard water calcium may build up and either clog the valves filter mesh or prevent the solenoid from firing correctly. Vinegar or other acidic cleaning solvents can normally remove the build up for a temporary fix but replacing the part is recommended.
The Inlet valve may fail electronically. One way of testing this is to use a multimeter to test it's resistance. Different inlet valves have varying expected resistances. Many inlet valves have resistances between 500 and 1500 ohms.
It should also be noted that the Inlet valve need a certain amount of water pressure to work properly. The exact number varies depending on the part and dishwasher however most dishwasher inlet valves operate between 20 psi and 120psi.