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TMC - will defo post how i get on. Need to buy more of the F4 (see my topic thread in the forum "applying F4") as I had an issue applying. Home base appears cheapest at £15, but have none anywhere in my area. Bought from B&Q originally at £33 hence wont be going back there.

a number of filling loops hang below the boiler allowing you to disconnect the pipe from feeding the boiler, if the case this will stop water flow into boiler and allow you to confirm the water inlet constantly flows. If filling loop is located internally, sounds like front of boiler needs...

thanks John - are there any obvious signs if it is the Heat Exchanger being the issue? Please note I have noticed very infrequent water drips from boiler, but not in my opinion enough to impact the pressure gauge swings so much, but am not a pro at these, but keenly interested. Suspect as...

Have a similar problem with my Vokera Linea - losing pressure gradually. Call out guy suggested a leak on the system, but didn't check anything else (scratchy chin & sharp intake scenario!!) so interested re the other options as mentioned above. Currently planning to insert Fernox F4 leak...

John , Mick, Many thanks for your respective responses, they're much appreciated. I suspected needing to de-pressure further to complete this job. Can you confirm de-pressurising is best performed via system being off and opening the external release valve and allowing the water to flow...

Hi All, New member here Understand per vokera call out guy that my drop in combi central heating pressure is due to potential leakage. The leak must be small as top up approx 1 every 6 weeks or so. When off pressure drops to approx 0.5 bar and when heating on raises to approx 1.0 bar...