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I've got a ravenheat condensing combi providing hot water. It's been running fine but recently when having a shower (not thermostatic just a regular mixer) the temperature will drop for 10 secs or so as if the flame's out then it will come back on for a while. Any ideas what's causing this...

I saw this high efficiency combi boiler in a B&Q sale and had to stick in me basket. It's been installed on an existing 1 pipe system well within it's capacity. I can't get hold of the installer which leaves me with no manufacturers warrentee and the following problems: Turn the heating on...

I've moved a radiator on a single pipe system and it won't get hot. I've shut off the other rads but still no joy. The lockshield valve is fully open and the trv is open too. Everything is new. The flow pipe gets very hot until it reaches the radiator but heat goes no further. This suggests the...