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the boiler has to be swicth on or off when we use a filling key ?

When I use a fill in key in a worcester bolier to put the pressure at zero bar to 1.5 bar, shall I have the boiler switch on or swicth off?
Alexandra, June 2009
Always best to switch off, so that the circulating pump does not interfere with the pressure reading

www.elanar.co.uk, June 2009
Off!

John, June 2009
link Click here to see other fixes for Worcester.