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i have a puma100e the problem with it is when i switch it on ,it starts to make a fuuny noise then the pipes start to bang ,then pressure goes all the way in to red ,then it locks out ,and the hw is way to hot even when turned down low ,

hi there i have apotterton puma 100e ,all of a sudden it has started to make banging noises and starts to shoot out hot air through a pipe on left hand side at the top ov the boiler the water is always hot and when it gets to hot the boiler locks out can any wan pls help