I have a wfw8300sw02 washing machine i just replaced the belt and i tried running a cycle and it flashes f28 its almost like no water is filling inside. how or what can i do to fix this

pump all the water out and stop the wash cycle your on
open the door
then disconnect the mains supply for 10-15 mins
then turn it back on and hope the software fixes itself
otherwise there is an issue its detecting
like the door interlock is being detected as bad.,..
if the motor isnt running perhaps the motor brushes need replaced and this is the cause of the flashing wash light
and motor not running
i would check out the brushes have atleat 3/4 " on them
if not replace them

No water fill
1.water valves closed----turn on valves
2. Hoses kinked---unkink hoses
3. Screen in fill hose clogged----clean out screen
4. No power to fill solenoid---replace solenoid
5. Faulty water level control---replace control
6. Machine did not turn on----check control & power outlet
???
Water will not drain from machine
1.kinked or clogged hose----clean drain hose
2.pump does not run----readjust & tighten pump-drive mechanism
3.suds lock----remove suds,, add cold water
4.faulty transfer valve---replace
5.defective timer----replace
6.loose belt---adjust belt

F28 is a communication error which usually means there is a connection that has come loose.Check the wires on the control board.

The error code F28 means one or both of these parts are bad.
Motor Control Unit (8540135)
Microcomputer Machine Control Unit (8540788)
It would be a good idea to order both, as both components have been problematic for error code F28

If you find either the MCU or the CCU(Microcomputer Machine Control Unit) fixed it.

You can download the online repair manual in the below link

https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/6545d78b3f479480852571650061b1ba/$FILE/8178558.pdf

On page# 4-20 it shows how to access your MCU.

the "HF" code is initiated when the water turbine(counter) sees an excess amount of water to fill the machine to the prescribed level- many things can cause this problem,however simply throwing components at the machine will not necessarily fix it. here is what i have run across on at least 3 occasions; the w/l switch tubing(air tube) is supported by a small retainer that establishes the tubes routing toward the side of the machine near the cabinet- if the hose falls out of this retainer,it is allowed to dangle in the danger zone near the spinning pulley/belt- the belt contacts the hose and wears a thin spot in the tube just enough the machine to fill and begin to wash initially, but air escapes slowly and machine goes back into fill mode,eventually the water counter sends feedback to the controller that it has filled with an axcessive amount of water and defaults to the "HF" condition. the cure is simple-replace the rubber tube and secure it along the side of the machine away from the moving components. its certainly worth checking out.

REGARDS IVERSH
A VERY HELPFUL RATING IS APPRECIATED FOR ANSWERING YOUR QUERY....

Hi, If this model has a belt, you might need to replace it. Once the belt gets wet, they are ruined. If the motor runs during the spin cycle and the tub does not turn, it is most likely the belt. If the motor is not running in the spin cycle, we need to look at other causes. If I can assist you further, please get me a model # so I can see exactly what washer you have.

Thanks
Vic

Dear customer,

              We recommend the following when a washer's cycles dont advance..

1. If the washing machine fills with water and begins agitating, but the timer does not advance, the timer probably needs to be replaced
   
2. If the timer does not advance while the washer is in a spin cycle, the timer probably needs to be replaced
   
3. If the timer does not advance during the rinse cycle, check whether water has filled the tub, if not, it is likely cold water related. Check the cold water supply valve, check the supply hose for kinks, check the filter screen and check the water inlet valve
   

For details on how to self test these parts plz refer to http://www.acmehowto.com/howto/appliance/washer/washer.php
Plz rate this solution.. thank you.. 

I took the top and bottom panels off the washer, followed the wiring and vacume lines, and found a small hole in the vacume line. I replaced the vacume hose and started washing. Everything is working great.

The cycle doesn't advanceWhen the cycle doesn't advance, it's probably the timer or a cold-water supply problem:

It's the timer, if your washing machine fills with water and begins agitating, but the timer never advances--or if the washer is in a spin cycle and the timer won't advance. Then you need to replace the timer.

It may be a cold-water supply problem, if the washing machine fills with water, agitates, drains, and spins, but then doesn't fill with rinse water. See There's no cold water.

check if hoses are reverse when installed