Very likely pump motor shaft seal leaks water into bearing casing buildup of rust and consequently noise. I just replaced $112 worth of pump assy and it's back to normal. I would also buy repair manual for $10 on-line to be sure how to disassemble the sump to get to the pump.
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If you are asking about your dishwasher I am going to guess you mean decibel level. Decibels refer to how loud the sound is. If you are interested in knowing about how loud your machine is, 45 decibels is pretty silent while 50-60 is about a normal conversation level and the average dishwasher machine is 52 dB. A vacuum cleaner is about 70.
here is link to F&P repair video. This video explains how to repair a F1 error code and replace the rotor
The most common cause of the hum/grinding sound, and often poor cleaning - is a blocked filter or debris stuck below that filter.
Pretty easy fix:
Get a phillips screwdriver near by. Pull out the lower rack (the upper rack can come out if you pull the little gray thingeys on the front of the upper rails.)
Remove the lower spray arm -- just pull it straight up.
Remove nine silver screws from the sump area that holds the filter down. Pull the filter up and out. Rinse the filter as best you can.
While the filter removed, with a flash light inspect all over the sump area - looking for stuff that should not be there and clean it out. Watch out for broken glass!
Replace the filter, screws and the spray arm. Fire it up and check your results!
You're describing vague, conflicting information. At first glance, I would think you have something stuck in the pump. But then it would be there in the rinse-only cycle also.
The anti-bacterial mode heats the water up to about 180F. This kills bacteria, and it also speeds up the action of the detergent. It could be dissolving whatever is in there.
The humming noise wasn't there in the rinse mode... The heater isn't on in the rinse mode - everything else is. But I've NEVER heard a heating element hum.
Cleaning the filter:
The filter is in the back in the bottom right. It's cover is held on by two 1/4 in screws. Under that is a large grate, and I sometimes find stuff clogging the screen (underwater, toward the center of the machine.) I'd start by looking there.
I have a fisher paykel dd603 dishwasher. If I select the normal wash setting on the top drawer, it posts the time in the lcd screen as 56 mins. The unit will wash as usual until it reaches the 28 min mark. At this point it will stay on 28 mins and continue to run, but it won't rinse or empty the drawer of water. Also it never counts down below the 28 min mark. It has flashed a F4 and F1 code. I've cleared them both, and checked to make sure that no water is standing on the bottom of the unit, and that the heating element is working. I should mention that the top drawer did overflow about two weeks ago, and that I did clean up the water. I don't know where to look from here. Any suggestions?