How To Replace a Dishwasher Float Switch
The
dishwasher's float switch controls the amount of water that is allowed
into the dishwasher. When the water reaches a predefined level in
the bottom on the dishwasher, the float switch turns off the inlet
valve. A defective float switch will cause the dishwasher to
overflow with water.
You can purchase a replacement float switch
online and save.
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Turn off the power using the appropriate method;
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shut off the appropriate breaker at the main electrical
panel, or
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remove the fuse from the fuse panel, or
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unplug the dishwasher.
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Figure 1 - Location of float switch in dishwasher
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Turn off the water supply valve to the dishwasher, usually
located under the sink, or disconnect hoses from the faucet.
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Below the dishwasher door is a panel, see Figure 1. The
panel is either held in position with screws and is removable or
is hinged to allow it to fold downwards. Remove or open
the panel. This panel provides access to most of the
dishwasher components.
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Identify the float valve on the inside of the dish compartment
on the bottom of the dishwasher. Ensure that it moves up
and down with ease. If it seems to stick, clean the stem
with a household cleaner and a fiberglass or plastic scouring
pad. If it appears to be moving freely then you may have a
defective float switch.
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The float switch assembly will be accessible through the
removable front panel. The method of mounting will vary
depending on the manufacturer. In the float switch
assembly pictured it is held in with a round plastic nut
accessible from the dish compartment. Some manufacturers
bolt the units from the bottom and others use a twist method to
release the assembly.
Note
1: You may have to disconnect the wires that attach to the
float switch in order to remove the assembly from the base of the
dishwasher. In most cases the wires will be attached via slip
on lugs. Use a pair of needle nose pliers on the lug portion.
Remember to identify which wire is connected to which lug.
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Remove the
assembly and using an ohm (resistance) meter or a continuity
checker verify if the switch is functioning. If the switch
is defective it will need to be replaced, it cannot be repaired.
NOTE 2:
Some manufacturers encase the switch in the assembly to the point
where it cannot be independently replaced and it requires the
replacement of the complete float switch assembly. Your
appliance parts supplier will know your requirement based on the
manufacturer and model number.
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Replace the assembly in the
same manner as it was removed. Remember to reinstall the
wires on the correct terminals.
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Turn the hot water shut off
valve on until you hear water flow, check the fittings and ensure
they are not leaking.
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Open the hot water shut off
valve all the way and again look for leaks.
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Replace the removable panel
or raise the hinged panel as the case may be.
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Turn the power back on to
the dishwasher.
