30 displayed in digital display of dishwasher
Error code 30 on a John Lewis (Neff) dishwasher means the anti-flood device has been triggered – water has collected in the base of the machine. The cycle is halted to prevent further damage. The instruction manual advises contacting an engineer, as accessing the leak source requires significant disassembly.
If 30 is displayed in red on a John Lewis dishwasher (example model number JLBIDW1200), it means the anti-flood device has activated. These John Lewis dishwashers were manufactured by Neff and the error codes may also apply to other Neff dishwasher models.
The instruction manual advises contacting an engineer. This is the recommended course of action.
What Does Error Code 30 Mean?
This error code indicates that the dishwasher is leaking – or that the device designed to detect a leak has triggered. In the base of most dishwashers there is a float mechanism and microswitch. If water gets into the base of the machine, the float rises, the switch activates, and the anti-flood device halts the cycle to prevent further water damage.
Why Is Finding the Leak Difficult?
Dishwashers are generally difficult to access internally. There is no back panel to remove for a quick visual inspection. While a lid can be taken off the top, this only reveals a sealed stainless steel tank and a few external hoses – not the internal components most likely to be leaking.
To access the base and components where water has collected, the dishwasher typically needs to be stripped down. On many models this involves removing the lid, the kick strip at the front, and both side panels to reach the parts crammed into a space no higher than around 6 inches in the base.
It may be worth a quick visual check around accessible hose connections for obvious signs of a leak, but a thorough diagnosis requires significant disassembly. Unless prepared to undertake this, booking a qualified engineer is the practical course of action.
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4 Comments
Grouped into 3 comment threads.
1 reply Hi. I’ve just bought a Hoover H Dish 500 dishwasher. It was plumbed in but the outlet fitting on the sink wasn’t cut open so the error code E30 appeared and water leaked out from the bottom of the machine. The outlet fitting has now been cut open and the dishwasher drains successfully but the program won’t finish so I can’t restart it and run a cycle. Do you have any advice for me please?
0 replies Having ERROR 30 on my AEG I saw drops of water running from the top middle outside water line on the dishwashwer. This leak will go down to the bottom tray, maybe only a few drops a day... Put it back. No parts needed, no plumber, electricians none. 4 to 9 seconds of work when you know it. (TOP, MIDDLE OF THE DISHWASHER; PULL IT OUT FROM THE BENCH, SEE THAT IT IS CLEAN AND TIGHT). Regards, Karl Olav Alme,
Having ERROR 30 on my AEG I saw drops of water running from the top middle outside water line on the dishwashwer. This leak will go down to the bottom tray, maybe only a few drops a day…
Put it back. No parts needed, no plumber, electricians none. 4 to 9 seconds of work when you know it. (TOP, MIDDLE OF THE DISHWASHER; PULL IT OUT FROM THE BENCH, SEE THAT IT IS CLEAN AND TIGHT).
Regards,
Karl Olav Alme,
0 replies Take the left side panel off, take water filler mechanism out, jet wash through ( may of become blocked). Tilt forward to reset anti leak device.
Take the left side panel off, take water filler mechanism out, jet wash through ( may of become blocked). Tilt forward to reset anti leak device.
Hi. I’ve just bought a Hoover H Dish 500 dishwasher. It was plumbed in but the outlet fitting on the sink wasn’t cut open so the error code E30 appeared and water leaked out from the bottom of the machine. The outlet fitting has now been cut open and the dishwasher drains successfully but the program won’t finish so I can’t restart it and run a cycle. Do you have any advice for me please?
Hello Simon. This article is about the John Lewis (Neff) brand of dishwasher so I don’t know if your fault is related. However, if water has got into the base due to a leak it may still be triggering the anti-flood protection which causes most dishwashers to just sit pumping. So make sure all the water has been removed from the bottom of the machine.