I have a zanussi jet system 1200, model wjd1257w. It is a washing and drying machine. It leaks water, I guess at the spin cycle or perhaps before it. I searched and found out that it could be either due to loose connection of the pipe to the gasket or the door seal itself needs to be replaced. I could not find that for doing it at home should I open the top and front panels all, or just I can do it by working around the front door?

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A good way to establish the point of the leak is to place a piece of thick cardboard beneath the machine and give it a short run whilst empty.

The most common leaks are from the 'Sump Hose' which connects the pump to the tub and the 'Door Boot' / door seal. Items such as 'underwires' from clothing can poke holes through them.

To get to the sump hose it is a matter of tipping the machine backwards to allow access. Lean it against the kitchen work surface and wedge something beneath it if you are doing the job alone. It's best to have another person to stop the machine falling forward onto you and of course for moral support and comedy observation :) Sump hoses are normally held on with spring loaded circular clamps (hose clamps). You'll need an adjustable wrench / mole grips or very large pliers. These clips can be fiddly to remove but once you get the knack...etc. Be warned : you will need a lot of sacrificial towels on the floor first and DO NOT pull off that hose if it is directly above you :D

To access the door seal it requires removing the lid. Remove the rear bolts, slide the lid forward or backward and it will un-hook.

In some machines the door seal has a couple of large circular wire bands with tightening screws. Some have spring loaded ones. Others have compression bands and require a good deal of persuasion to remove (mind your fingers).

I would initially explore the door seal fully with my hands to save messing around. 9 out of 10 times the hole can be found without dis-assembling the machine yet. The next trick is then finding out whether or not you are comfortable removing and re-fitting it (as described above).

If neither of these are causing the leak then look for rusty trails inside the machine, follow them if possible to the source.

Before you do anything - check that the inlet hoses are screwed in tight - this is also another major cause of leaks and can be solved inexpensively.

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