On Mon, 03 Dec 2012 10:44:49 +0000, MM wrote:


There IS no fan noise! There is *no* noise of any kind. The LED on the
DKO970 comes on. That's all.

The DK0970 manual is at
http://mkwheatingcontrols.co.uk/download/dko970-972.pdf if you have
not already found it.

Most such controllers use relays to drive external bits so if there
really is absolute silence (not even a very faint click - you might
have to listen with a screwdriver to your ear and on the box) then the
controller isn't telling anything to do anything and lockout will
occur a short time later.

The voltage on the controller terminals 3 to 7 should give you a clue
as to what is going on. The LED should also flash during startup to
indicate what is going on - does it (for a successful start)?