On 22/01/2018 18:35, Tim+ wrote:
BG came around to my Mums to look at her combi which wouldnt supply hot
water when the CH wasnt calling for heat.

Apparently some crud in the valve which they sorted and to their credit,
they *didnt* try and sell her a new boiler. Instead they are pushing a
system €œpower flush€� for £600 which sounds a lot to me.

Assuming Im prepared to spend a day messing around looking for drain cocks
and bits of hosepipe, is there any reason I cant do this myself?

No, its quite doable. You can even hire the power flush kit if you fancy
doing it that way.

Mains water flush works quite well IME. I did not bother taking each rad
out of circuit, but did arrange it so that each rad got full mains flow
all to itself for several mins by closing off flow to all rads bar the
one being flushed. would start it going wait til it ran clear, and then
give it a couple more mins (some suggest bumping it with a rubber hammer
as well to dislodge more crud). Then move through them one by one - open
flow through the next, close off the previous etc (i.e. making sure not
to cut off a water path altogether). When All are done, reverse the flow
direction and do it again:

http://wiki.diyfaq.org.uk/index.php?...ating_flushing


Is there a recommended flushing substance to treat the system with prior to
a full flush?

Sentinel et al do system cleaners that you can lob in upto a couple of
weeks prior to flushing.


--
Cheers,

John.

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