Dishwasher cavitates. I have a Smeg DI612CA9 dishwasher. It has developed a fault where the main wash pump cavitates. It fill with water then the pump starts and begins cavitation. If you squeeze the pump output hose the cavitaton stops and the machine operates normally. This happens on every cycle. I have replaced the water level switch as I suspected that the machine was not filling correctly but it made no difference. Does anyone have any ideas what is causing this?
Does the drain hose loop up to the top of the unit before going to the sink drain? If it goes down first it may be siphoning or draining by gravity.
The drain pipe is fine. There is no siphoning pre wash cycle. When starting the machine the drain pump evacuates the sump. The fill cycle then starts and continues for 45 secs before the wash pump starts. Water continues to enter the machine for a further 15 seconds but the wash pump is now cavitating. The only way to stop this is to squeeze the wash pump outlet hose for a second or two. I have disassembled the machine and I notice that during fill the airbrake fills with water and stays full while the pump is cavitating. When the pump runs correctly the airbrake drains .
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SOURCE: how to mend it .com - Bosch dishwasher SGS43A12GB-27 does not stop filling
possibly the inlet water valve stuck open tho this is rare.
disconnect the valve electrically and see if the fault is still present. if so, the valve is stuck open and needs replacing
SOURCE: SMEG Dishwasher - Water fill level is too low
Hi, I found your problem stuck here from one year ago.
I will post my solution the same, as reference for you and more users with same problem, apologies.
Re: smeg dishwasher fails to fill with enough water to sucessfully wash. It does put some water in.. but nowhere near enough.
Before checking parts inside the machine, ensure that water is coming from the faucet at the back with regular pressure.
To start check the water level sensor.
This is usually a floater sensor located on a side inside the dishwasher.
Check if water level is working properly, if the floater is getting stuck then that is the problem.
If the water level is OK, then the responsible is usually the inlet valve, or clogged inlet lines.
From description it looks more like a faulty water level.
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