Change Switchmaster Mid Valve to Salus?

I've just had my S/Master changed (duff contacts) for a Salus (MV 322) 3 port but now cannot have combined HW & CH! CH is available permanently but HW is only available when CH is switched off. The SW Midi had 6 connections but the Salus has only 5 - the Red & Orange have been connected together by the plumber. Can't get hold of him as he's on hols for another week - has anyone got any suggestions? Prefer to have CH and switch to HW when reqd but it's a bit of a pain not to have it supplying both as it was before. Many thanks in advance.