W455H, W555H, W75, W160 ETC Drain valve sticks in the closed position.
This is a very common fault on these drain valves and it is very often the case that a new drain valve is fitted. However there is a cheaper option if you are happy to do a small amount of work to renovate the drain valve. Most of the time the cause of the drain valve sticking is the small motor and gearbox jamming up or simply the torsion spring has broken. The part numbers below are the main parts required to renovate your drain valve and they come to about half the cost of a full drain valve. Why not try this out and same some money.
Torsion Spring 471780401
All of these parts can be purchased through this website. I hope this helps you and more tips to follow another day.