Question about Frigidaire 24 in. FDB1050RE Built-in Dishwasher

1 Answer

Dishwasher always fills to float valve

I have an Electrolux Frigidaire Dishwasher, Model FDB1050REB2. It appears to run correctly, except there is a always about 1/2'' of water in the bottom of the tub (above the sump). As in, enough water for the float switch to turn off the system.

Even if I unplug it, and plug it back in, it will immediately fill up to the float switch cutoff.

As a result of this, the dishwasher never drains completely.

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  • P-dud1983 Aug 03, 2009

    The problems you are describing sound like my initial impression of the problem.

    Here is what I have done:

    To rule out blockages I have removed it, cleaned it (a little mold was in it, but no blockage). I also removed the drain pump and housing and ensured there was no blockage into the dishwasher.

    Next I went inside the dishwasher and removed the impeller and basket and cleaned them (no appreciable build-up or debris).

    Next I went online and found a manual and a wiring diagram at www.frigidaire.com. There is a way to set the dishwasher into diagnostic mode where you can run through each portion of the cycle independently. So I went through each part of the cycle. The first logical test stage was the drain stage of the cycle. When I put it on drain, water was easily pumping out of the dishwasher, the problem was that water was still pumping INTO the dishwasher for the entire time I left it on.

    The last test I performed was to let the dishwasher fill up to the float valve (As it will do no matter what, so long as it's plugged in). I double checked that the washer was in 'idle' mode. Next I set a small weight on the float valve to push it back down. When I closed the door, the result was that water started to run again. The dishwasher was NOT in a wash cycle and should NOT be filling up with water.

    I think it is either the supply line solenoid valve (wired backwards perhaps), or a short in the control board which constantly supplies voltage to the solenoid valve until the emergency float switch overrides it.

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There are actually several possible causes of your problem. I will briefly describe each in hopes that you can isolate the problem and will then know how to proceed.

If the water doesn't drain from your dishwasher, check these:

Drain line/air gap
Pump
Drain valve and/or solenoid
Belt
Motor
Timer
Drain line/air gap A clog in the drain line or air gap (if there is one) is the usual reason that a dishwasher won't drain. Often the problem is at the point where the drain line attaches to the garbage disposer or household drain line. If you remove this line, you can clear any debris from the hose or hose connection. Be sure to reattach the hose before starting the dishwasher again.

Pump Your dishwasher pump ejects the water. The pump is usually mounted directly to the motor, then attached to the bottom of the dishwasher. You can reach the pump from inside the dishwasher, but first you need to remove the lower rack, the spray arm, and the spray arm support.

Look for an impeller--a round plastic fan blade-type of device that spins around. This is the wash impeller, which forces the water through the spray arm. Beneath the wash impeller is the drain impeller, which is similar in size and shape to the wash impeller. The drain impeller pushes the water toward the drain port. These components make up the pump. If any of the pump components are defective, you need to replace them.

Drain valve and/or solenoid Many dishwashers use a drain valve with an electric solenoid. When electricity flows to the solenoid, the valve opens and diverts the water to the drain. Sometimes the solenoid, or the diverting lever, sticks and prevents the dishwasher from draining or filling properly. Try to free up the solenoid to lubricate the lever. Otherwise, you may have to replace the solenoid or pump assembly. With these systems, the motor always rotates in one direction. When it's energized, the drain valve diverts the water.

Other dishwashers simply reverse the direction of the motor to drain the dishwasher. These units don't have a drain valve. Instead, there's a drain hose connected directly to the pump housing.

Belt One brand of dishwasher uses a belt to drive the pump. If this belt is broken or has fallen off, replace it.

Motor If the motor isn't turning or working, the unit won't drain. First check to be sure you have power to the dishwasher. If not, see the section "It doesn't work at all." If the motor hums but doesn't turn, it may need to be replaced.

Some dishwashers are susceptible to getting stuck if you don't run them regularly. If you haven't run the dishwasher for more than a week, you may need to manually spin the motor to free it up. If the motor is defective, you need to replace it. Dishwasher motors can't be serviced.

Timer Part of what the timer does is control the motor and drain valve. If the timer doesn't work properly, the water may not drain and you need to replace the timer. This problem is uncommon.

Posted on Aug 02, 2009

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Water Inlet Valve

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Enter your model number to see parts for your dishwasher.
Help me find my model number


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Enter your model number to see parts for your dishwasher.
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The float switch is actuated by the float assembly. It is a protection device designed to prevent the dishwasher from overfilling. If the dishwasher won't fill with water, it may be because this float switch is defective or stuck.


Enter your model number to see parts for your dishwasher.
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