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Tim, If I were you I would get a plumber in to do this, as you do need to turn off the water and partially drain the system, although this is not a big job. I assume that you have an installation manual that you received with the boiler, if you take a look at this then you can clearly...

Yes, I managed to get the problem fixed. I believe that it was the thermostatic blending valve that was the issue. I simply removed this item from the system, opened the unit up to take a look. Whilst gazing at it, part of the assembly jumped up under spring pressure. When I put it back together...

I have a Powermax 185 Boiler which is around four years old. Since installation in a new property around four years ago, I have had numerous lock out faults. However, my most recent problem appears to be with the hot water flow rate from the system, which has just dropped to about a third of...