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Update!! I switched the hot water on and off at 20 sec intervals, and I can clearly see the lever arm moving OK. On about the 6th time the hot water failed to come on, so I held the arm with a screwdriver with the water flowing and the water then went hot. I reckon it's just the adjustment of...

thanks for that feedback guys, The diaphragm was definately replaced as the old (holed) one was left in the box, so I also have the part number. I'll go back and have a look and see if I can see the microswitch lever moving

Thanks, Is it safe to test this by manually closing the contact on the microswitch?

I have a problem with the hot water, basically the hot water will turn on the first time the boiler is switched on, then after that will either not come on at all or just heat up for a few seconds. boiler is a turbomax with green buttons. pressure is 1.1 bar. Reading through previous posts it...