I have taken out a faulty switchmaster 1151 controller and fitted a Horstmann centaur plus c27. The wiring should have been straight forward.
switchmaster wiring was, 1 2 3 4 5
CH live neutral water not used.
Horstmann wiring is now, 1 2 3 4 5 6
neutral live not used not used water ch
Basically nothing works now except boost on the hot water. It should have been straightforward, but going from a mechanical timer to a digital unit seems to be a problem. I think it is a simple wiring error, but am not sure what to do now.
Thanks in advance (hopefully)