Question about Zanussi 23 in. ZDT6252 Built-in Dishwasher

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Zanussi ZDT6252Non filling / rinse hold light flashing problem

Like any of the "fexes" I have seen, I have cleaned the filters on the feed hose with no luck. I took off the side panel from the machine to see if the overfill system was blocked up. There is a large chamber half way up and slightly towards the back of this unit which is filled with a liquid/sediment mix beige/brown in colour. Is this a deposit or is this there from new? Looks strange?

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  • Garry Keogh
    Garry Keogh Apr 21, 2008

    Sorry Guys, The problem is the one caused by the "Flood Warning" system. If I disconnect the feed hose and start a cycle, then wait until the drain pump cycle is complete and reattach the feed hose, the built in dishwasher will fill one time only. It will then proceed into the wash cycle, will drain this first fill and then go into the flood warning alarm (rapidly flashing LED #1). I can repeat this any number of times I like. If I start a cycle without first letting off the back pressure from the flood warning system. Can anybody tell me if and where on the automatic water level sensing system a blockage would occur and if it can be relieved? Is the machine simply over filling during this first fill due to a faulty float switch?
    Can I simply take off the solenoid or any other connections to check?
    It seems to me that either
    (A) The flood alarm passage is filling with water the first time the machine fills, not draining, then it goes into alarm the next time it drains and tries to refill.
    or
    (B) The machine is over filling and correctly setting off the flood alarm.

    Can anybody tell me that they have seen this and fixed it before as it is not obvious watching the machine fill and drain with the side panel removed other than some of the passages on the level sensing matrix are filling and not draining.

    Thanks

    G

  • Garry Keogh
    Garry Keogh Apr 21, 2008

    Thanks Marrie,
    But I don't think it is related to a partial fill. The fill level seems perfectly adequate. The machine once it has been started with the fill hose removed, will go ahead into any of the wash cycles. The problem is that once it drains and goes into the "refill" stage of the cycle, it will not open the solenoid valve as it seems the level sensing system has flagged a flood warning alarm.
    My problem is why the level sensing system is filling, and not draining into the sump of the machine. This would surely allow the solenoid to open again to fill.
    I can easily clear the level sensing matrix by starting a cycle with the feed hose disconnected (no water pressure on the solenoid) and allowing it to drain the sump of the machine.
    From here it will start a cycel but will always halt once the program requires a second fill.
    Similarly, if I power cycle the machine without removing the feed hose, then it will just not fill, wait for a few minutes and flash the #1 LED telling me that the flood alarm has activated.
    Any clearer?

    G

  • Garry Keogh
    Garry Keogh Apr 21, 2008

    Thanks Maanita,
    But, the appliance is a European integrated Zanussi Dishwasher, not a North American washing machine. This seems to be a common problem but I have not seen a logical fix yet.
    Thanks

    G

  • Garry Keogh
    Garry Keogh Apr 21, 2008

    OK then, I have looked at the machine again and it is just as I described.
    I have checked the main solenoid and the magnetic diaphragm and it all seems fine. The coil has not failed and the diaphragm is airtight e.t.c.
    I also measured the coils of two other solenoids that are mounted directly to the automatic level sensing matrix on the same corner as the main inlet solenoid valve. Both of these coils seem fine also.
    I have checked just about everything I could see except one pressure switch (or something that looks like a pressure switch) that is totally inaccessable (positioned in front of the pump on the underside of the machine).
    The problem is in the operating logic of the machine and I guess it is due to one of the channels in the pressure sensing matrix not draining.
    Has anybody ever found a fix for this fault?
    It appears that this is a common failure on these particular machines but there is no standard fix on any forums.
    Anybody???

    G

  • Garry Keogh
    Garry Keogh Apr 22, 2008

    Thanks TJBENGR,
    But I have covered both of your suggestions and it is neither. The problem is related to the flood alarm. The machine has a system that will stop if from filling if it believes that it is about to overfill and flood. Somehow this seems to be activated during the first regular fill and prevents subsequent fills. The sequence times out waiting for a switch to open/close but then goes into this alarm.
    This is a very common problem in this machine yet nobody seems able to tell me where the flood alarm is sensed on the water level sensing matrix and where the switch is that registers this overfill condition.
    Look at all the similar problems below and you will see that a few describe the same symptoms! I have checked a few forums and nobody seems to have fixed this problem before.

    G

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Had similar problem with dishwasher holding on rinse and rapildly flashing cycle light. Tried all fixes suggested above finally called engineer. He diagnosed the problem by emptying dishwasher into a bowl and all the drain pump impeller blades came out.
Ordered new pump unit and had it fitted all in for £135.
On inspection of old pump found impellers easy to change and pump is not to difficult to access. (New impeller kit £35).
Hope this helps and save some money!

Posted on Jul 18, 2008

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Just a thought...The discharge hose usually goes to the sink top (vacuum breaker). From there to the drain..often on the garbage disposer (top side) where it has a tendency to clog. (either place). The last one I fixed actually had a rag piece stuck in the strainer (and pump) at the bottom of the washer.

Posted on Apr 21, 2008

  • Timothy Brooks
    Timothy Brooks Apr 21, 2008

    Regarding the water level (pressure switch). When these become older, they usually get stuck - on or off. When stuck on (full) the washer will not change the water because it thinks its full. When off (normally empty) it requests more water, which when completely full..will drain in the overflow, causing a flood warning.

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Hi

The water-level switch regulates your washer's fill volume. This switch is usually a diaphragm device with a small, clear tube attached between the switch and the bottom of the washer's outer tub. As the water level in the tub increases, the pressure on the air in the tube increases. When the pressure reaches a certain level, it activates the switch, shuts off the water, and signals the timer to begin the agitate cycle. If the switch is defective, it may prematurely signal the water to shut off. If so, you probably need to replace the water-level switch.

Posted on Apr 21, 2008

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Check that the motor pump is working , that can be the cause for your problem

Posted on Apr 21, 2008

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Plz check teh following link

it can be of help
http://www.repairclinic.com/0088_11_1.asp

Posted on Apr 21, 2008

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Tap symbol indicates a water problem.

Check that the water supply to the dishwasher has been turned on.

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Check the water supply first, see what you find.

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do the following steps: God bless you
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F4 message on the top drawer, fisher paykel. I clean the filters and arm every week or two.


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1)
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  • Note: Lights blinking, pump running and controls dead indicates an over fill fault
2)--4 Flashes--Draining failure. Drain pump, control board OWI or water indicator defect

God bless you
5_15_2012_4_40_23_pm.gif5_15_2012_4_40_44_pm.gif

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