Are the cold and hot inlet valves supposed to allow the same amount of gallons per hour (or liters per hour) through them? Since it was new, our cold fill was much slower than the hot. Now, 3 years later, it takes 7 hours to complete a load. I have swapped the valves and now the hot just trickles and the cold gushes out. In my troubleshooting, after I swapped the valves for testing purposes, I filled the tub with hot water from buckets to accelerate the filling process. The wash and especially the rinse cycle is MUCH faster.
My assumption is that the cold fill valve is faulty. Has been all along, however it is almost completely faulty now. Solenoid gets pretty hot. Understandable since it is "on" for an hour at a time. I have city water with a pre-filter and softener, the inlet screen is clean.
Also, a theory of operation question: During the rinse cycle, does the washer fill for a predetermined amount of time, or is it a predetermined amount of water?