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Thanks PEDANTICVINDICTIVEMAN. I've currently got the boiler running on a 'spare' DHW exchanger. I've tried caustic soda on the original DHW H/E but it still doesn't look properly clean. The spare (fitted by Corgi man) is supposed to have been cleaned up prior to being swapped in. Since the...

Thanks Bengasman. I've currently got some Fernox running in the CH side of things. Is this likely to help the DHW side, or do I need to do something else to clear the hot water side?

I have a Halstead Ace HIgh boiler which is providing intermittent hot water. When a a hot tap is open, the water gets very hot, then the boiler cuts out, then fires up again. Leaving the tap open for a while causes kettling, and the overheat to trip. The problem seems to be that the gas...