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Hot water doesn't always turn on when requested - so we end up putting the central heating on when we need to run a bath or shower to get the boiler to fire up.
Problem seems to be with the flow switch. I used to be able to take it of 'fiddle' and put it back & it would work again for a while. the 'while' is getting shorter & shorter
Anyway doing some tests it seems to me that the microswitch is not functioning properly - checked up on price & it's £23.25 form a 'cheaper than trade' place on the web
A similar looking microswitch at Maplins is £2.09 - the official part comes with all the clamp & stuff - but I don't think i really need that...
Does the job - EXCEPT... that I connected to wrong part of the switch... and the boiler was on with no water flowing and off when i turned the taps on - to make it worse I had broken off the extra contact to try to avoid accidental connection problems
Ah well - At least i know that part will do the job... I need some tidy connectors to attach the wire to it as well so I will get them tomorrow too...
Glad it worked because we're having the same problem with our boiler... hopefully that will only need a 99p microswitch too. It's coming to pieces at weekend to find out.
OK - another 99p switch from Maplin - connected right way round this time - soldered joints covered in shrink wrap tubing this time for better insulation
Jobs a goodun
thanks for looking... and thanks for your encouragement John
no hot water for 4weeks,after reading these suggestions,took the micro switch off and cleaned it all with contact cleaner spray,hey presto,works brilliant now(dealer wanted £37 for new switch).
DHW flow switch for Alpha CB24 combi boiler?
- the official part comes with all the clamp & stuff - but I don't think i really need that...
- EXCEPT... that I connected to wrong part of the switch... 
because we're having the same problem with our boiler... hopefully that will only need a 99p microswitch too. It's coming to pieces at weekend to find out.
