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can anyone tell me a good place to find a burner with gasket and a diaphragm (gas/air mixer) for a 27HE?

When i turn the HW tap on the boiler bangs with a nice gas explosion inside it, sometimes it even blows its own flame out!! so far its showing 3 faults on the diagnostic button- firstly it read fault A8 (programmer lead) then next time- E2 (CH flow NTC defective) now its saying A7(hot water...