Appliance had low pressure to lower rotating arm, and almost no water at all to upper arm, after stripping the machine down, I discovered the 15mm isolation valve supplying the aquastop hose to the appliance was faulty. The appliance was rebuilt, and i appear to have created a secondary fault.
Water now enters the appliance, and is almost immediately pumped out by the float switch. I obtained a connection and circuit diagram from bsh appliance care, and all the connections appear to be correct.
However, the miniature micro switch operating the level switch, has 3 legs 2 of which are terminated: 1 white to the float switch and earth to the appliance body, the third is not terminated.
Whilst the appliance is filling and then pumping out the third leg of the level switch has 240v standing on it. If I operate the level switch manually the cycle begins. Following manual operation the appliance can be turned on and off, and the cycle will carry on normally. However as soon as the appliance finishes one cycle and calls for more water the cycle will not actuate again unless i manually actuate the level switch.
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Both upper and lower washing arms operate on the water pressure and angle of water flowing thru them.
Pressure provided by water pump.
Just about anything that contacts the rotating arm can stop it.
Best thing to do is re-arrange items in dishwasher so that arms can spin freely.
One can always spin washing arms by hand to ensure proper clearance.
It could be a motor or a pump issue. The dishwasher has a motor that attached to a pump which forces the water up into the sprayer arms and during the drain cycle, it pushes the water out of the dishwasher. The motor (and pump) located beneath the dishwasher. Check if motor spins. In case it spins, the problem is with the pump ,in case it doesn't spin it could be a motor problem or a motor and pump problem.
First of all: filter plate clean? Clean any locked hole. 1) Can you remove the upper spray-arm and verify if holes inside are locked by any residus. Clean the holes , and check if pure water come out when you fill the center hole with some water. 2) Switch on the dishwasher , coldest wash cycle dish-washer empty and without the upper spraying arm. Once you hear water streaming in, open the door and look if a little water fountain comes out from the center hole where the upper spraying arm was fixed. If not, this canalisation is blocked and should be cleaned. Try to continue the wash cycle, often the water pressure will clean itself this canal. Check also lower spray arm: it should be rotating a while and ejecting water thru its holes. If not, verify this canalisation as well.
3) Put the spraying arm again on its place, verify also the sealing else water pressure is going down and spraying will not turn and spray water.
4) Again, continu a wash cycle, open the door and look; upper arm should be rotating and some rays trown out.
Hopefully, this helps .
If not, pump pressure may be low; have a repair verify, can be that only brushes in the motor must be replaced, can be the pump worn out and to be replaced at all.
The pump in the dishwasher is supposed to provide enough water pressure to turn the spray arms and make them rotate. The pump is faulty and not giving enough pressure or the arms are stuck. Try spinning the arms, if they rotate smoothly, you will need to replace the pump.
Check to see that both upper and lower arms are working. You can do this by suddenly opening the diswasher about 6 in and observing if the wand arm on top is revolving. This is done by water from the lower arm being pumped up through a tube mounted in the lower basket that centers over the lower arm and upper arm. Check that the tube is clear. check that water from the lower arm center is being pumped. Check that the hole is clear. if you have hard water, then sometimes the holes get clogged up and the arm will not rotate.(just like a lawn sprinkler) The upper arm rotating is what washes the detergent out of the soap dispenser. To aid in cleaning the spray holes, pour some white vinegar in the bottom of the machine about two cups, and turn the machine on high temp wash. Do not let the mixture drain out untill you have cycled it about five times. When the wash cycle has about finished stop and restart. The acid in the vinegar will help disolve the calcium and hardened soap. After the finish rinse cycle, you can put a little lemon juice in the machine and let it was through, that way the vinegry smell will disapate.
the most common problem is low water pressure.when you start the dishwasher check the amonut of water in the bottom of the dishwasher there should be about an inch of water in the bottom.
if needed add some more water to the unit and see what happens this can determine if the fill valve is bad,or the control board.if the unit washes change the fill valve or check your water pressure,if there is no change then the main wash motor needs to be change because it is not putting enough water through the system to properly wash.
Thanks for using FixYa. First of all please check the Water temperature by using a thermometer inside the dishwasher to measure the water temp. It should be as close to 125 degree F to 140 degree F as possible. Now try using the temperature boost feature if your dishwasher is equipped with this cycle feature and check if this will help your wash ability issues.
Now check the Powder soap by making sure that you store your soap in a dry environment and it is not stale and clumping together. Possibly try a different detergent like a liquid or gel. Also, make sure the dishes are loaded properly, or dishwasher is not overloaded.
To check the proper filling dishwasher will fill with water up to and around the heating element. If water is more below the heating element, you may have low water pressure or a problem with the fill valve. Try & listen if it sounds like it is spraying the water around with enough pressure.
For low water pressure, try to clean the screen at the entrance of the fill valve, sometimes the fill valve can fail and not allow the proper water into the dishwasher and may need to be replaced. And, check the spray arm and pump cover for splits or leaks
Low water fills are a very common trouble maker with today's dishwasher.
Please do rate this solution and revert for further assistance.
On the LG LDF xxxx dishwasher family, the Vario feature uses a motor/check valve to switch between "full power" cleaning from _either_ the lower or the upper spray arms, never at the same time. So, not seeing the upper arm spin during the lower arm spinning is standard operating procedure.
But back to your problem. Step one would be to remove the filter assembly again and make certain that there is nothing (debris, broken glass) blocking the white areas where the check valve rotates to switch between upper/lower spray arms. A blockage there ~could~ cause impotent spraying/cleaning.
If there is no blockage and the impeller remains in good shape, suspect a failing wash pump motor. Try to isolate the noise to that motor.
Watch for error codes on the display and report back what you find, OK?