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Before I part company with any money I rang the Ariston Tech. line again today verifying that I had intermittant no hot water due to the main flow switch not closing. I mentioned about the pump and although he said it could be a possibility he was more confident in stating that it would be a...

Is it possible to open the flow switch to check the diaphragm. Could someone please clarify which heat exchanger could be blocked is it the primary one (inside the combustion chamber) or the hot water one (looks like a drum) located next to the diverter valve.

Is it possible to clean out the heat exchanger or do I have to fit a new one?

Same fault re-occured today. Spoke to the tech. people at ariston who said it could be the primary circuit flow switch not making contact due to dirt inside the primary water circuit. Manually got hold of and operated the microswitch with a hot water tap running and the boiler did fire up...

OK so would you recommend seeing how it goes and repost if fault re-occurs? Could you tell me what the diff.pressure sensor does and how to check it. Many Thanks.

Ok now I am confused. just been and tried the ch and the boiler fired up rads started to get hot etc. Switched off the ch and turned on the hot water tap and boiler worked as normal. IE hot water. Watched the microswitch to the left and it appears to be being closed correctly. Any ideas about...

As the topic says. turn on hot water tap can hear/feel the pump running and see the divertor valve "pin" lift and bridge out the switch but there is no ignition and hence no hot water. Any help, fault finding suggestions etc. very gratefully received.