Porgrammable Room Thermostat

Right, the Dil switch is set to pumped and not gravity. The wires are as follows:
Neutral: Black
Live: Red
1 (HW Off): Red ok
2 (CH Off): (Blank) ok
3 (HW On): Yellow ok
4 (CH On): Blue this goes to your new stat

the blue wire from 4 (ch on) goes to "com" on new stat, the "on" connection from stat goes to brown on the hsa3.
 
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The original wiring of the programmer was correct, all you had to do was put the new stat in series with the 3 port actuator (hsa3) so from 4 in prog to "com" in stat then "on" in stat to brown on 3 port valve, so put the wiring back as it was and wire the stat as shown.

edit forget the colours, all the cables are "live" at one time or another
 
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