Hi David,
You should be able to find the meaning of the Error code shown on your Hotpoint machine at:
http://www.hotpointservice.co.uk/Service/faq/errorcodes.html
Error code 15: Water is not being pumped out and a flood condition could occur. Check that the drainage hose is raised to the recommended minimum height and that the pipe is not
blocked.
(I think the Error you have is as above but please check as I am not 100% sure)
Hope this helps!
Vanessa, January 2006