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The purpose of a dishwasher timer is to control the unit's cycles by regulating the length of time that power is directed to each component. It is not common for dishwasher timers to malfunction, and they are often misdiagnosed as having failed when they are actually fully operational.
Tip: If you do have a timer motor that has failed, consider replacing just the motor itself and not the entire assembly. Timer motors can be considerably cheaper than the complete timer assembly.
Before you can replace your dishwasher's timer or its motor, you must first locate the device. Timer assemblies are located either in the control panel at the top of the dishwasher door, or behind the lower kickplate at the bottom of the unit.
To get to a timer located in the unit's control panel, first examine the outside of the appliance. Sometimes, depending on the model, you only have to remove a couple of screws in order to remove the outer control panel. In other cases, you will have to remove either the entire internal door panel, or the entire external door panel. In each case, the panel can be removed by removing anywhere from 6 - 10 screws. Be careful to not remove the screws at the very bottom of the door that are actually a part of the hinge assembly. Removing the hinge assembly screws will remove the entire door from the appliance, which is not at all necessary to test the unit's timer. With all of the screws removed, the door panel should be easy to lift off of the door assembly. If you have difficulty lifting the panel, look for other screws you may have missed. Then remove the smaller control panel cover. It will be held in place with either a couple of screws or a couple of clips.
With the dishwasher's control components fully exposed, you may discover that your model uses two timer motors. The second one will be a rapid advance motor. It is operational when the wash cycle is cancelled or reset. If you are unsure of which timer is which, then test each of them.
There will be two wires extending from the round motor housing. Follow the wires until you locate the connectors. Label the wires so that you will be able to reconnect them later in the right positions. Carefuly remove the wires. Do not pull on the wire itself. Needle nose pliers may be needed to pull gently on the wire connector.
Remove the faulty motor and replace with a new one. Reconnect the wire connectors to the terminals. Replace the door panel(s) in the proper positions, reconnect the power, and then test the dishwasher to ensure it is functioning normally.
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