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cheers for that bengasman.shall chase up some litmus paper--where's that chemistry set i used to have as a kid!! not sure if cleaned at time of instillation of boiler but i reckon the ph test may be revealing.how, incidentally do you check for inhibitor concentration.is there a way of telling if...

thanks.i had a huge amount of plumbing work done about 18 months ago and not sure if the system was flushed out or not and if inhibitors added etc.not able to find out from plumber.is there a way of telling how manky the system is? certainly the water coming out when bleeding rads is clear but...

thanks bengasman.are you able to expand on that please?

thanks for that.any thoughts regarding if there is a connection between the pipe repair and the lockout.

hi.this is my first posting.can anyone help. this boiler is around 4 years old and is now a fully pumped selaed system.it has worked fine until recently when it appeared to start locking out.it may be a coincidence but a week or so prior to this, the flow and return pipe at about 15ft from the...