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:D It isn't moving at all.... we've got cracking water pressure here, and the pin didn't move at all.....

OK .... at the risk of divorce I'll ask the missus to come and turn the tap on and off again :D gimme a sec. (If I aint back within 5 mins I've been drowned in a bathtub full of cold water)

spot on scatman .... I was looking at the wrong bloody relay ! So ...... divertor valve ?

possibly .... I'll check

hmmmn ..... When I started this thread I was of the opinion that it may have been the DHW thermistor. As they have the same part number in the halstead list I decided to try swapping them over and see if it made any difference. (put the CH thermistor in the DHW and the DHW thermistor in the CH)...

errm.... new development now..... just discovered I can't perform the test described above as when the CH is off, the burner doesn't fire ... even with the tap on full pelt !! the little DHW pressure switch is coming up and closing the relay. When I power it off and back on .... the pressure...

I'm an arse :oops: Can someone explain the plate heat exchanger to me.... there's me thinking it was just to warm the cold water a bit before going to the burner, but looking at the diagram it looks as though the cold water runs straight to the hot tap in my bath......passing through the...

S O R R Y CHAPS There's just suddenly been a FLOOD :D of messages all at once and I got muddled. When the boiler is in DHW mode it does use the pipe with the pressure relief valve on the end of it.... it justs gets diverted down into the heat exchanger plate...

OH.... I see...... If the CH flow pipe gets hot, then the water is running into there. But surely my pressure gauge would go off the chart ??? I'll wait till the CH cools down a bit and try it.

Ignore that last entry from me........ I've just looked at the flow diagram of how the boiler works in DHW mode, and it uses the pipe with the pressure relief valve to send water into the heat exchanger, and then out of the DHW outlet.... So, how can the water going into the heat exchanger...

That was the original problem, but the guy lowered the max burner pressure slightly and that seemed to cure that, (before it was making a modulating sound like WA-WA-WA-WA, now it doesn't, but now the DHW is even cooler). I've had a good look at the pipe I was feeling that leaves the heat...

Hi, I have a halstead finest gold and have a DHW problem. It's cool, and gradually has got cooler. The thing is I can fully open the hot tap, run around to the boiler, feel the pipe coming out of the heat exchanger and it's piping hot, but if I feel the DHW outlet leading off to the tap it's...