Appliance Repair Questions? Ask a Technician for Answers ASAP
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.
Let me know how you get on, and if you have any further questions.
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?