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If you switched the feed hoses over and the problem reversed itself, cold has gone from fast to slow useing the hot water pipe and hot from slow to fast useing the cold water pipe then this would indicate a fault in the water supply from the hot pipe. What sort of pressure is coming from the hot pipe when not connected to the machine but filling in to a bucket? Are there any shut off valves before the pipe that supplies the hot water? Are they fully turned on? Any kinks in the feed pipe for the hot water? Has the hot water feed pipe collapsed internally? Change the pipe to check this and not just at the machine side.
Connect the dishwasher to the HOT water side. Although most dishwashers have a heating element to heat the water, they are normally installed this way to reduce the amount of time the heating element is on. This not only extends the life of the heating element, but also reduces the amount of electricity required to heat the water. Another helpful hint: Before you run the dishwasher, run the hot water tap until the water runs hot. This will fill the dishwasher with water that is already hot instead of the cold water that normally sits in the line after the hot water has not been run for a while. If you have questions, please let me know. I hope this helps you.
There is too much pressure on the cold feed, reduce the pressure on the cold by partly closing off the tap on the cold.
Or ensure the hot feed is fully open and not blocked, check if there are filters inline - remove the feed pipes at the washer end and look into the inlet valves - clear if blocked.
The inlet valve is common to hot and cold water with only a small pipe to fill the machine, the cold water is being forced back up the hot water pipe due to the pressure you can feel the pipe cool down after running hot then go to warm, if hot water is flowing the pipe will stay hot, if not then cold is going up the hot pipe.
Dishwashers normally are hot or cold feed. My wife runs water at the sink to get it hot going in before turning on the dishwasher. You can use either cold or hot water. We have ours hooked up to the hot water side. They work better hooked up to the hot water.
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