I fitted those washers last year after my flow switch kept sticking and it's been perfect ever since. They're made from silicone so are very tolerant of extreme temperatures and won't warp like the original ones do. You can still find them on ebay if you search for 'stuart turner monsoon washers'.
Well the boiler was kinda working with the diaphragm all broken up. As the plumber was leaving I asked whether or not I can use it and he said it's best not to but it wont blow up. Sitting here in a freezing house is no joke
Hi
A plumber came out to look at my boiler (Worcester Greenstar 35 HE Plus) as it was either failing to ignite or 'exploding' on ignition, he pulled out a broken diaphragm from the mixer (think it's p/n: 87155058830). He needed to order the part but because of Christmas wont be able to come...