advise on how to carry out a mains flush on my sealed central heating system

[Matt22]

Hey can any one give me some advise on how to carry out a mains flush on my sealed central heating system. Can I flush it buy using the filling loop to get clean water through the system? Or do I need to connect a hose to a drain off and flush water in through there. Thanks for any help

 

[M.Joshi]

Do you intend to circulate some chemical in the system to loosen up sludge etc. prior to the flush?

 

[Roger Welton]

What is the problem that makes you think you need a 'mains flush'?

 

[REDSAW]

you dont want to do this without isolating the boiler.
is it a new installation?

 

[kay-jay]

best way is to remove smallest downstairs rad, connect hose to each valve, one to tap,one to grid, isolate flow and return valves under boiler. shut off all rads bar one then slowly open tap to allow water to circulate. when running clear, close off rad and open next one and so on.

a sealed system shouldn't be in need of a flush though really, unless it was a conversion from open vented and flush not done properly then, or at all

 

[SafeGasInstall]

you best option is

1.call a local plumber
2.do it your self
3.do it your self and then call a plumber to put it right

usually option 1 is the most cost effective way of getting job done
option two is drain down and wash all rads in the the garden ,but watch out for leaks after refitting all rads .
option 3 is what happens usually and cost the most and is stressful to you and your family .

 

[Matt22]

Its had some sludge remover put in I have found out by a plumber but he never came back to drain it down so has been runing like this for 6months now. So thought I may need to flush it. If I do as Kay-Jay says do I need to isolate the boiler I have heard this can be the tricky bit as the valves on the boilers can be prone to leaking once turned off is this true?

 

[kay-jay]

They can do. How old is boiler?

Sent from my GT-I9100 using Tapatalk

 

[kay-jay]

Drain off and refill a couple of times. Circulate water in between drains.

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[Matt22]

Would you reommend that over flushing through a downstairs raditor then? When you say circulate between drains do you mean fire the heating up for say 15-30 mintues. Thanks for the help