My hoover washing machine wont spin and is full of water. model number is hnl 9146-z

It's a safety feature that doesn't allow the machine to spin when there's still water in the tub. The drain pump has probably failed and you would need to replace it (there are some good places online where you can buy appliances spare parts). Try to set your machine on a 'Drain' cycle and see if the pump works.

We changed the door sensor and now the hoover hnl 7126 will not spin I have drained the water out,