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Mine has just started showing signs of failing again! Need to get a high flow rate for boiler to fire up. It seems these diaphragms last about 5 years. I've ordered another. Boiler now 10 years old and so far: -Diverter Diaphragm number 1 (£23) -Expansion vessel (had to fit external...

PS after you confirmed the part number I got it from Gas appliance spares in Preston www.gas-spares.co.uk. They charged 22.96 inc VAT and delivery. They will give a further 20% discount if you are trade. Parts Center wanted £27.11. Gass Appliance Spares might be worth checking if you...

Cheers Chris, I have the part, going to have a go at fitting it next weekend, too much on this weekend (England cricket and football). I have a handfull of washers in the box, I'll fit these where they match up with the old ones. It also comes with a tube of sealant. I've never fitted one...

Thanks Chris, Do you know where I can get a CB28 diaphragm kit from? (Alpha won't sell me any parts directly). Is it the same as the CB24? (I've seen a kit for a CB24)

I have a CB28X. I have to open the hot water tap almost fully before the boiler will fire. If the flow rate is not very high the boiler will not fire. I have changed the DHW flow switch and no change. I guess the problem is with the diverter valve, so my questions: Can I get a diagphram...