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Well this thread is getting rather stupid , as there are those of you who are grammatically challenged and cannot spell and only want to insult you even though they are not aware of the whole circumstances and are too full of their own self worth to listen to the original question , then want a...

AGAS , or rather numbnuts , the pcb was changed recently , and there are 2 micro switches on this boiler , the one for the Dhw one is at the back, I’m having it fixed but just wanted some prior knowledge so as I wouldn’t get ripped off , something I’m sure you would do ,

oooh get you pair , first of all it was my mistake as I originally tested the wrong switch , as for the bullshyte as you put well what can I say apart from GOODBYE you have been about as much help as a chocolate fire guard

So the story so far , I’m thick ! As the Microswitch is ok , but the problem is still there , ie no hot water unless the central heating is on , anyway I’ve tried to get a boiler engineer out but even though I’ve explained the problem thoroughly he still wanted to charge me £45 just to come and...

Apologies if I have offended you originally , you’ve been a great help I will order another switch and take it from there , while I was checking it I noticed that the pin that pushes the switch seemed a bit tight , could this be a problem ?

Yes that’s the one , I’ve downloaded the same one when I first noticed the problem

Just took micro switch off turned on hot tap , pushed screwdriver into switch and nothing ? So could this be the fault ?

Can we continue this tomorrow night as I feel I’m getting somewhere now ?

BIASI 24S Nothing else just that

They say a picture says a thousand words so that is what my boiler looks like

Sorry missed the other post , and yes I think I do know where the diaphragm goes, looking at the boiler it’s on the left at the end of the diverter valve ?

Ok , I can see what looks to be a switch in a clear box which is held in position by a ‘fork’ looking retaining clip is this the micro switch ?

Well your opinions certainly have my attention now , but where is this differential you are on about ? And what switch ?

Well your opinions certainly have my attention now , but where is this differential you are on about ?

Thank you for that , however it’s not the right manual and nowhere does it tell you how to fit the diaphragm which was my original question ?

Thanks but I wanted help not sarcasm so if you can’t give me any constructive information then keep your opinions to yourself

It was a home serve engineer who spotted it whilst doing a healthcheck on it , I haven’t got the manual !

we have a biasi 24s combi boiler which has developed a fault whereby we can only get hot water out of taps with the central heating being on ? Have had it confirmed that the fault is probably the diaphragm and after more research believe it is , but after phoning round a couple of gas engineers...