Ok, I'm not getting hot water from my Halstead Ace combi.
First off the system wouldnt fireup, the "nipple" wasnt creating
enough pressure to actuate the DHW flow switch ie wouldnt poke out
enough.....I've artificialy resolved that and now the DHW system will
activate and fire up but it wont produce any hot water.
I've got 4 volts across the thermister(chechek its resistance compared
to the CH one, maybe 500ohm differance at room temp, the plate
exchanger is cold when there is a demand for hot water.
The water flow regulater seems fine and the filter is clean.

The CH side works fine.....help, what is the problem????