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Float Switch Questions

What is a float switch?

A float switch is a device used to ascertain the level of liquid or water contained within a tank. The most common type of float switch is generally a float which raises a rod that activates a micro switch that operates in two stages. How this works is if the liquid rises to the trigger level at the first stage, the pump is activated. If the liquid continues to rise due to a failure of the draining system or pump failure, the second stage is activated where the source of the liquid is cut off or an alarm is set off. Listed below are a few common questions answered by the Experts on the float switch.

Why doesn’t a Bosch dishwasher fill? There is no power to the valve and it operates like there is water inside.

It should be noted that some of the Bosch dishwashers do have a hidden float switch. This means, the float switch is not visible on the right or left side of the tub when you open the door of the dishwasher as per the traditional design. It is mounted on the side and to access it the dishwasher needs to be pulled out. Once pulled out, on the left side you can see a chamber into which water collects and it should have a white plastic rod connected to it going into a small micro switch. The things to check here would be a clean chamber, free of any build up, a good switch and the rod is connected and moving freely. Clean this entire area and restart the dishwasher. If it fails to start and fill with water, the problem could be with the control board.

How would someone reset the float switch on a Bosch dishwasher?

First you will need to turn off the dishwasher and tilt it forward at a 45 degree angle. This will help drain the water from the base pan. Before doing this, place a towel under the dishwasher to soak excess water and avoid spreading of any water which has spilt. Once all the water has drained out of the base pan, reinstall the dishwasher and pour a gallon of water into it. If this water drains out immediately, does not wash or refill and there is still water left in the base pan, then try again. If there isn’t, you have done the job correctly.

Why would a Bosch Excel dishwasher flash the “check water” symbol?

The check water symbol can flash if there is a problem with the water supply, the gauze filter/hose is blocked or if the water inlet is defective. If all these check out fine, the problem could be with the float switch which is typically a small switch found below the dishwasher tub. The inside of the dishwasher has a plastic cylinder which floats up as the drum fills with water. The float is connected to a switch. If the switch is defective it will need to be replaced. Ensure the plastic float is not stuck in any manner in the upright position. In case it is, water will not enter the dishwasher as the signal it is receiving is that the tub is full. The continuity of the switch can be checked using a multimeter.

How can someone put together a float switch on a Samsung refrigerator ice maker that fell off, also there is a frosted pieces, plastic bracket and sensor wire that is hanging lose?

This unit would have tabs at the bottom of the ice tray that holds the assembly in place. Probably the ice tray or the whole ice maker may need to be replaced. Replacing is a better option than repair since the unit may be under a lot of stress where a repair may not sustain it for long. Replacing the icemaker ensures the sensor was not damaged while it was hanging. It also gives you the latest updated ice maker. To replace, you need to remove the ice maker. It has two screws on the front lip holding it in place. Remove these screws and pull forward the entire ice maker out. Unplug the wire harness and it will be visible to you how the remaining part of unit disassembles.

A float switch is a delicate device which has its own components as well as is a part of a bigger system. It functions to keep a control check on the liquid levels. Other components too if affected can influence the functioning of the appliance. To determine the issue lies with the float switch alone can be tricky and complicated to an untrained eye. Common problems that may occur with it sometimes can be fixed by a layman with an idea of the logic behind it. To get a fair idea regarding the float switch issues faced by you, Experts can provide information and solutions.
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