ariston euro combi mx20

[ChrisR]

Don't pay through the nose for it. Email me & I'll tell you where to go, because I'm interested to hear the fix for this one.

 

[mustang]

bit of a mare really, tried everything, like to know what the problem is, lost 5hrs to it so want to find out. will let you know outcome

 

[mustang]

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

 

[ChrisR]

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!

 

[mustang]

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.

 

[ChrisR]

COuld be a venturi effect thing again. Narrowing in pipe gives lower pressure to side aperture. Holes need to be clean. See wot I mean?

 

[ChrisR]

Any progress on this??

 

[mustang]

boiler removed, new fitted. broke boiler down found nothing. no manual to see if restrictor missing

 

[ChrisR]

Thanks, but a pity.