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Thanks - I will definitely look into this!

Fixed!!!! I can thoroughly recommend Wickes pipe freezing kit - worked a treat! The gate valve was clogged up with brownish residue of some sort - put a new valve in anyway - as soon as the ice plug broke down I could hear a very reassuring gluggidy glug glug glug as the supply filled up...

picasso it looks as though you have nailed it! drained off a good pint or three and the water level in the small tank has remained totally static. As far as I can tell the pipe at the bottom of the CH tank goes directly to the gate valve mentioned above. I risked loosening the bottom...

Many thanks for your replies so far - most appreciated! Just had a look in the loft - CH header tank is full I've left the timer on HW OVERRIDE all night (CH OFF) and hot water temp is about 20­ºC at a guess (ie - NOT HOT!) Nearest Rad to the boiler is in the bathroom and its toasting...

Nope - nothing like that - coil entry and exit are straight through runs of pipe and both disappear through the floor down to the boiler.

I'll check tank in the morning - yes there is a gate valve which shuts off the supply from the small CH header tank - it connects directly to the bottom tank heater coil pipe after the 2 port valve, going down into the boiler in kithchen downstairs (tank is upstairs directly above boiler in...

A couple of days ago we noticed our hot water was tepid, then it just stayed cold. Timer hasn't been fiddled with by the kids and when I select override for HW the boiler kicks in sure enough but quickly shuts off again. When I feel the inlet and outlet of the tank heating coil, when I...