Faults: intermittent drying for about 1 year, then stopped heating water.
Solution: removed EWM1500 controller (includes switched and LED display) and replaced 10A relay.
The relay was available at:
http://cpc.farnell.com/jsp/search/productdetail.jsp?SKU=SW03935
It is possible that the problem was just a dry joint as the old relay seemed fine.
knockavoe
April 2014