Hi, I was having the same problem but with a G572 (that's about 10
years old) though this might help you still as i believe they're all
built fairly similarly.
My problem is I would start the cycle and I could hear the motor in the pump turning however no water would enter the machine.
Open the front door and look at the sprinkler on the base. Underneath
it is a small tower (about 3cm high) and it has a cap on top of it.
Take the cap off (mine just pulled off) and clear any grime that has
built up inside of it. Now try to use the machine. (while I was
clearing the grime I could actually hear something neutralise, as if
there was air pressured up behind the grime).
It may be that the tray underneath the machine is full of water and
this appears to activate the anti flood device and shuts off the water
supply. If you remove the panel under the door you should be able to
check. There are 2 screws to the side and 2 to the top of the small
panel. I am uncertain where the water came from on my machine but this
appears to have solved my problem.
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there is not much you can do with hard water as it is the minerals in the water that cause the problem
it is cheaper to let the washer heat the water as it only heats what it wants
Hard water comes from bores as most town water is put through osmosis filters that remove the minerals and produce the soft water
If you have a bore supply the seriously consider fitting a osmosis filter before the house as it will fix all sorts of problems found in the shower, hot water system , septic/sewerage and general health of the people in the house.
The initial cost will be outweighed by the cost savings from detergents and heating
The soap wont come out if there is no water. Does the detergent flap open? If so, the dispenser is OK. If not, you need a new dispenser. If the machine is not filling, check the pressure switch and or the tubes that go to the pressure switch, they may be blocked, tricking the machine into thinking its already full of water.
I am guessing you are using the Centigrade temperature scale ... which would be 149 degrees F. 149 is way hot in terms of regular house hold use. Probably just right for a dish washer.
I would expect most tablet detergent would disolve properly at this temperature and with proper water pressure in the machine. You should have plenty of both in this machine. May I suggest you give liquid dish washer detergent a try to see the results?
The pump seal may be the problem. There are a number of places on the net where you can get step by steps and the the parts to replace the seal. Some recommend just getting a new motor pump housing which is 150. I just purchased the impeller assembly (it has all you need) and it cost $25 with shipping. Only thing is I did not realize I also had a leak in the solenoid stem valve. Let me know if you need the link I was talking about.
I've experienced the same thing. Try very slowly rotating timer dial, click by click, until the water starts. Sometimes 3 or 4 clicks will start water. (You're advancing the clock.) Usually water starts in before the dial points to, "Short Wash." If this doesn't work, advance the dial to, "Off," unlock and open the door, reset, close, the soap dispenser, close and lock the door, and slowly advance the dial until the unit starts. I think this problem is a clock to pump issue and what I've described does a reset of the system. This happens to me once or twice per month. Poor engineering but still better than buying a new machine...at least 'till now.
Being from the US, I have not worked with this LG dishwasher, not any down under.
But the first thing to do is use only a name brand dishwasher detergent powder. Don't use gels or tablets, ever. Many cleaning problems are resolved by avoiding the ultra cheap generic detergent.
If problems continue, confirm that the heating element is still working. Dishwashers need heated water to activate the soap.
If problems continue, my next move would be to remove the gear beneath the lower spray arm and clean everything and remove debris that could be blocking the water flow.
-Have you changed the dishwasher soap recently? What are you using? Is the powder remaining behind in the soap dispenser?
-Have you removed the filter in the sump area, cleaned it and removed any debris under the filter. (watch out for broken glass that is almost always found in 5 year old dishwashers.)
-You are running water at the sink until it gets hot, but you may still have problems if the heating element has failed. Recommend you check that element. If you can get to the element, check resistence of the heater to see if is has any at all.
If heating element checks out good, the next common problem is a failing wash pump motor.
Check the spade/lug wiring connectors under the unit at the motors They can work loose. These newer units only use the heating element for a short time. If you get it running again do not use tablet soap. Start your sink's hot water until its too hot to touch then start the washer, let the tank fill then open the door and pour in an additional gallon of hot sink water mixed up with liquid cascade soap. To get "Energy Star" compliance, They have made trade offs to use less water and energy. When mine is running it still doesnt clean very well at all. consider installing a small R.V. water heater under the sink or nearby.
Also make sure your drain hose is clear and has no kinks in it.