Mid position actuator newly installed issue

[Hlruk1]

Hi, I had a Drayton ma1 mid position actuator recently installed as central heating had stopped working. Now my heating and hot water will not come on at the same time (with timed settings) and I have been advised that my thermostat is not working which is causing the problem (from the emergency plumber that had come out). I’m slightly confused as surely if I manually turn my central heating on and the hot water is working then the ma1 should move to the mid position which it does not.. any advice would be greatly appreciated.

 

[Ric2013]

This is a goldmine point. Op has said it’s a MA1, that said it could be a ZA1 which is the diverter

I'm wondering whether the OP has looked at the old valve which was presumably replaced, or has looked at the box, or whether the OP will confirm that that is what is written on the new valve.