well, replaced pump, diverter valve, secondary h/e, diaphragm, flused all pipework removed and inspected all pipes that i could. Put back together and now the pin on flow switch does not operate at even on htg unless i turn off flow/return valves on boiler and then htg works until o/heat. run out of ideas on this piece of sh*t now so will be replacing boiler. Ariston say blockage on sec/ h/e, or dont know, real helpful
There are probably sensor type pipes which go to the primary flow switch - yes? Or is it built in to the diverter casting?
If it's pipes, where do the pipes connect to? What's between the sensed points? Could it be there's meant to be a restriction to develop a pressure difference, but it's gone?
It does seem that with everything else changed, it must be the flow switch faulty.
Where are you? - fair set of spares you've accumulated there!
Do seem to be a restriction missing, although i cannot see where it would fit, looks very basic method of operating yet cannot get it to go. real strange.
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