Thanks. Hoses were replaced a few months ago.
Pressure from city water is fine.
Cleaning the rusty screens. It was working but filling really slowly.
http://www.acmehowto.com/howto/appliance/washer/check/inletvalve2.php
The inlet valve may also need replacing. Looked it up on the net. Whirlpool $20 - generic for WP $11. It comes with instructions too but looks simpe.
Getting the back off looks tricky. Clips and screws. I have taken PC’s apart wo i should be able to get the back off.
I think the inlet valve may be it. I will put the cleaned screens back in and try in the morning.
It took me about 30mins. Most of the time was spent moving the washer around a small hallway.
Depending on the model Whirlpool you may not take the back off. A lot of them are serviced by removing the cabinet.
If yours is one of them, you remove the two screws from the lower left and right of the control panel. Then flip it back. Unplug the connector that is attached to the top of the cabinet. Then pop out the two clips that attach the back panel to the top of the washer. Then open the lid, grab the lid and the front of the inside of the cabinet and pull it towards you. The whole thing will lift right off easy as pie.
Then after that you can do what I did: throw the damn thing away and get a new machine. (Well, maybe that is a bit drastic...but what the heck)