Honeywell motorised valve not working correctly?

[John.g]

Thanks, that's what I thought might happen alright, so obviously cannot stay in mid position except calls for both HW&CH, still, a very ingenious design, it also has another resistor to give a AC de magnetizing current.

 

[SJB060685]

Thanks, that's what I thought might happen alright, so obviously cannot stay in mid position except calls for both HW&CH, still, a very ingenious design, it also has another resistor to give a AC de magnetizing current.

It does mate yes.

 

[spanner]

H/w is default position. If Last call was central heating valve stays until next call depending on cylinder stat satisfied and its hot water priority..