There are some obvious signs that could indicate your bleed valve is broken and requires replacement on a heated towel rail. If you notice that the bleed valve is corroded or worn down, or stuck, it may suggest that a new valve is required. Also, if your heated towel rail is leaking out of the bleed valve, it is likely the valve has broken.
To find out more, browse our dedicated blog, How to replace a heated towel rail valve.