At the beginning of the cycle the dishwasher is attempting to pump out any residue water in the waste pipe and sump. It could be that the motor is sticking but you would probably also suffer from it not draining properly.
It may just be noisy pump. I have a similar model and it is also quite noisy but nothing extraordinary.
When the dishwasher is pumping out at the end of the washing cycle it may be quieter when there is water in the pump/pipes but then gets noisy as it 'pumps air'.
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dishwashers come with the promise of being the "quietest dishwasher in
its class," according to Frigidaire. However, a quiet dishwasher doesn't
necessarily mean that the dishwasher is silent, as some noises are
normal. It can take some troubleshooting at times to determine if a
noise coming from the dishwasher is typical or if it indicates a larger
Listen for the sound of water filling and draining throughout the washcycle. These sounds are normal and do not indicate an issue.
Pay attention to the drain
motor, which operates at the beginning of each cycle. This noise should
be fairly quiet and should not sound like a loud, grinding or banging
Note that the sound will change
when the wash cycle moves between the lower and middle spray arms. This
sound should be temporary and fairly quiet.
Look for hard items in the dishwasher
grinder or filter if a loud crunching, buzzing or grinding sound is
heard. The dishwasher can typically grind up these items within one or
two cycles, but the item may be lifted out and discarded to eliminate
Remove the bottom rack and spray
arms from the bottom of the dishwasher if there is a loud noise coming
from the dishwasher that does not resolve itself. Look inside for the
impeller, which is round and spins. Remove any debris that may be
clogging up the impeller or pump.
A sound during certain cycles indicates a broken part. By the information provided sounds like a pump may be the problem. You may need to contact a service tech about this issue. If the appliance still under warranty, the service should be provided for free.
Every time when you hear noises (other than the normal ones) in the appliance, it indicates there is something wrong and it will worsen over time, so as soon you hear something is not ok, get assistance.
dear sir the problem you have sounds like the solenoid that opens the drain actuater can be worn out open the bottom panel run tru a cycle observe when the solenoid open it may be that there is something causing the solenoid to buzz either worn out or a wire or something in the way causing not to close proprly thanks from gilles
This buzzing sound can be from a couple things. A lose a lose kick/access panel when the motor and pump is in operation can cause a slight vibrating noise. Try tightening securing the dishwasher and kick/access panel.
Second, (most likely) their can be an obstruction or debris in the water pump. You may see a plastic grid (4" x 6"; filter like) in the right rear of your dishwasher; Try removing the grid (1 or 2 screws 1/4"/cross tip), then use a dry-vac to remove any debris. *
Safety: As a beginning, please remember to perform the repairs with the power-off and ensure you have water in the dishwasher before restarting the water pump cycle (the water-pump can become damaged while dry-spinning and water enters the pump suddenly)
The filter basket in the bottom could be blocked, but it is more likely the outlet hose having become full of foul smelling gunge.
You could try filling the machine with very hot water and plenty of dishwashing detergent, running it without dishes for ten minutes and then pumping it out to get plenty of hot detergenty into the drain pipe.
If you want to be economical you could aim the drain pipe into a bucket on a chair to catch the emerging water and go through the process a few times to try to clean out the pipe without wasting water or detergent or energy.
The contents of the bucket after the first run will give you an idea if you are on the right track.
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