The EP2000 series connections are
1 H/W Off
2 C/H Off
3 H/W On
4 C/H On
It may be lelpful for troubleshooting and diagnosis to deselect H/W on the programmer and just call for C/H.
Being an unqualified muppet I do not understand the wiring and switch arrangement in divertor valve heads but have been told on here that under some circumstances the signal asking the boiler to turn on is supplied from the divertor - there may be a fault with divertor head.
http://www.diyfaq.org.uk/plumbing/controls/midpositionvalve.htm
The boiler is obviously good - it has just lost a "please turn on" signal somewhere.
Good luck...
Peccavi
January 2010
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