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Rob, Home Appliance Technician
Category: Appliance
Satisfied Customers: 420
Experience:  20 yrs. experience with a major worldwide manufacturer.
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When I empty my full sink, some of the water drains out of

Customer Question

When I empty my full sink, some of the water drains out of the internal vent on my dishwasher. The drain loop is higher than the sinks and there does not appear to be a blockage in the waste system under the sink. The dishwasher drains normally after a cycle.
Submitted: 4 months ago.
Category: Appliance
Expert:  JamesI replied 4 months ago.

This appears to be a matter of pressure and flow rate.

Can you upload a picture of the setup under the sink please?

There are a few options such as fitting a non return but thats not an ideal approach, by seeing the setup I may be able to give you a better solution.

Customer: replied 4 months ago.
Thank you but I am okay with the drain waste system. The pipework could be lower but I had already raised the dishwasher drain loop to be higher than the sink wastes. There are no blockages in the pipework. I am now going to check out the non return valve on the dishwasher.
Expert:  JamesI replied 4 months ago.

Let me know how you get on, and if you have any further questions.

Expert:  JamesI replied 4 months ago.

Hi Martin, I havent heard from you in a while so wanted to follow up to see how your have got on with the dishwasher drained problem?

Customer: replied 3 months ago.
Hi James,
I have sorted it myself , thank you. Manufacturer comments on the non return drain valve in the dishwasher were not helpful. I was not happy with the waste pipe layout under the sink originally, so I decided to re-configure it and put in a lower connection to the external waste pipe. Backfilling now not a problem when the sink is emptied.
Expert:  JamesI replied 3 months ago.

Just to clarify you ended up changing the waste pipe layout, as I thought you mentioned you were happy with the waste pipe layout above and wanted an alternative solution?