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No goes straight to fault on hw lights ok on ch

Yes reset and still same heatin g works pump fault light on water demand

Yes

Both pins are moving in and out ! I assume the pin on top at rear is the ch pin, this comes out and the heating comes on and goes in and it goes off all fine. i also assume the pin facing me is the hw pin, this comes out, the switch clicks and the light on the front panel switches to the water...

It comes up and down for the heating on and off doesnt move for water but the one facing you comes out for water

Is this the pin on the top of the diverter valve ? the one at the front facing you comes out when calling for water and the one at the top comes up for heating

Where is that located

I am looking for a bit advice. I have a baci 80e boiler and have had a few problems lately. I have had a plumber out a couple of times. Once when it wasnt firing up, pcb changed. Then it was losing pressure, recharged expansion vessel. Now when calling for hot water the pump light flashes. Water...