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Would it be easy to tell by looking if the DHW heat exchanger was blocked, I removed it last night and ran cold water through it, it seemed very clean and flowed easily. It made no difference to the water temp though. Last fault code is F 64 irreversible electronic system malfunction. I...

is that the DHW heat exchanger

Hot water is not getting hot enough. Problem started 2 months ago when first thing in the morning it was cold then started to get hot then cold again. ( Boiler was switching on and off ) Usually after leaving it for 30 mins it seemed to be ok. Then it seemed to just get warm instead of...