Question about Frigidaire PLD4375RFC Dishwasher

2 Answers

Frigidaire PLD4375RFCO (3 years old). After finishing the washing cycle it starts repetedly doing noise. It is like pumping the water. I removed the cover inside and found it is not pumping water out but there is some other pump (wheel) that I believe is for pumping water to spray it inside. This activity starts very occasionally at any time and repeates in some intervals. Sometimes there is nothing happening for few days and starts for no reason. I made short video of this - I can email. Diswasher works correctly.

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  • Bretislav Kulhanek Aug 21, 2010

    Thanks for replay. It is not the drain pump what starts working. There is another motor which rotates the wheel in the mid of the sump area (I can see it) that (I believe) recycles the water inside the DW. Can I send you short video recording of this activity?

  • Bretislav Kulhanek Aug 21, 2010

    Thanks for replay.
    It is not the drain pump what starts working. There is another motor which rotates the wheel in the mid of the sump area (I can see it) that (I believe) recycles the water inside the DW. You can see the short video recording of this activity. The first part is normal drain pumping, the second part is the strange activity (the issue) which starts any time after DW has finished any cycle. Bretislav

  • Bretislav Kulhanek Aug 23, 2010

    Thanks for the service manual. I ran all tests - no failure, no error. But what was strange it looks like the "strange activity" (recognized just by the sound) continued during some of the Relay/Triac and Sensor Test.

    I observed that after the drain pump empties the sump area it is entirely empty - but after drain pump stps some water comes back up to the level to cover the thermistor. Might be the water the reason? The test for Soil Sensor reports value 42.

  • Bretislav Kulhanek Aug 23, 2010

    I removed the water from the sump using sponge. Nothing changed, the "strange activity" continues (not continuously). So the water doesn't trigger it.

  • Bretislav Kulhanek Aug 24, 2010

    I did what you recommended - I removed the drain hose from the badger and put it on the ground level into extra container. I ran drain pump. The level of water in the sump area lowered a little but still some water is there. The "strange activity" was back in short runs. I opened the door and let it overnight. When I closed in the morning I didn't hear anything. I suppose it might start after longer time (as many times before).

    Do you think the issue is in the electronics (control board)? As all tests for basic functions work properly it should be something independent - just wire, etc.

    What is your recommendation? That is my last question - then I post "Accept Solution". Thanks for your help.

  • Bretislav Kulhanek Aug 24, 2010

    It was very helpful and professional. Despite we haven?t resolved the issue completely I know the direction what part to replace (with some risk not being right). But with your help I could eliminate other possible causes.


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Looks like there are lot of things happening with your dishwasher.
It is important to note whether there are any lights flashing on the front panel when it finishes the wash cycle.

Have you tried to turn off the mains power at the circuit breaker and back on after a little delay?

I will need some more information before providing you a probable cause of the problems. We do not have any facility for receiving emails. You can dry to upload the video on to a
public site like google and provide a link.

Posted on Aug 21, 2010

  • 2 more comments 
  • Sam Aug 22, 2010

    You did not clarify if there are any lights flashing on the dishwasher when the pump motor starts by itself.

    (this is good video and very helpful). It appears the pump motor is starting up and recirculating the water remaining in the sump. It does not appear that there in water being taken in from the main water inlet otherwise the amount of water would have been very large.

    Also I asked in my previous comment if you had turned off the mains power on and off at some stage. I am assuming you have and it makes no difference.

    I have found a service manual for your model. It does not explain the reason why you are having the problem but atleast it will help you understand each part inside the sump and how these work. See pages 9 and 10.

    I am suspecting there is some defect with the control board (page 20) which is causing this unexplained behaviour. But it costs about $100. So not a cheap experiment.

    Please let me know if there is any error message on the display and I will go through this further.

  • Bretislav Kulhanek Aug 22, 2010

    Thanks. This was the first I did - I turned off main power. The "strange activity" started again. I did it at many occasions and it started sometimes after a while, sometimes after few days (w/o using DW in between).
    There is no error message, no signal light.

  • Sam Aug 23, 2010

    I am guessing that the drain hose is bringing water back in from the sink outlet. Can you remove it from under the sink drain and run direct into sink to check. Also if you are using a insinkerator then run it to make sure the sink drain is clear. The soil sensor might be getting triggered by the water coming back from the sink drain.

    Good luck. Please rate the solution if you find it helped otherwise post a comment so that I can help you further if possible.

  • Sam Aug 24, 2010

    based on what you have observed - you are very patient, I am suspecting the control board triacs which provide signal to the wash pump are firing intermittently. I was trying to find out if there was any external trigger. I thought the soil sensor might be doing it, but if this is happening with nearly empty dishwasher, then sensor may not be playing a part.

    Yes it is a gamble of about $100 to replace the controller but still cheaper to get a technician on site.

    Good Luck.


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  • Frigidaire Master
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What is hapening, is your dishwasher has a small leak in the bottom sump area. when a sufficient amount of water collects in the sump from a leak, it then actvates a polystyrene float level which cuts the washing cycle out and puts the drain pump motor on. This pump can continue for a long period untill the water is removed from the sump. It will also sound like washing is taking place, but its not.

Posted on Aug 21, 2010

  • carlos_g53 Nov 03, 2010

    How would you go a about finding such a leak. Is it likely the Sump Gasket, or is it likely a crack in the sump housing which will need to be replaced. Is there a good way to determin where the leak is?


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