Hotpoint washing machine

more than likely the rear bearing has gone bad and when a load is applied the difference in weight distribution causes the knocking.

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Suspect bearings. With door open wiggle the top of the silver drum If it moves up and down inside the tub, replace the bearings

Sounds like it could be relatively expensive to put right.
Personally, I think you would be better in investing in a new washer, more so in view of the fact that is 7 years old.
There are numerous possibilities for the symptoms you describe.
Hope this helps you to come to a decision.

Yes, this washer does have a heating element.
Make sure there is a good water pressure at the inlet valve/s,
or the powder will not dispense.
Make sure there is no blockage or obstruction in the drawer, \also make sure you have the powader in the correct compartment.
Hope this helps.

I didn't think you were suppose to use powder soap in front load machines

with experience, put powder in the first, softner in the middle second, pre wash in the third, but with that model i find its always best to use a liquid or gel direct into the machine, it makes the life of the machine last longer, also stops any build up residue

is the drain pipe installed properly and have you cheaked the water is properly on and the water intake filter cleaned hope this helps.

Depending on which compartment the powder is remaining in, it could be low water pressure causing the problem.
If it is taking some down, but not all the powder, then try putting the powder towards the front of the compartment.
If all else fails then I suggest you get one of these dispenser balls that you put straight in the drum with the washing.
Plz rate this solution.
thanks.

You have a seal that is not working right for one. and 2 you have a water pump that is not working. because it is not limiting the water supply.

it wont be the machinei think.
try doing a hot wash cyle on an empty machine with some descaler powder or soda crystals to clean it out.