Central Heating System Losing Pressure Or Leaking? - Fernox Leak Sealer F4 Express Via Radiator

[@علیاکبرزارعی-ز4ض]

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[@rikm555]

If your boiler is losing pressure and you can't find a leak it could be that your expansion tank needs repressurizing. You can lose water through the pressure relief valve if the tank pressure is too low.

[@DanielJohnHowTo]

thanks, out install is rather basic but that sounds like something to definitely check.

[@rikm555]

@@DanielJohnHowTo If you have a Combi Boiler the expansion tank is inside it.

[@Paul-mg7bh]

At the start of the video you turned off the radiator valve at the bottom. I watched the fernox video and it said to open this when using the sealant. Any help would be appreciated, thanks

[@rikm555]

@@Paul-mg7bh You need to close both valves initially. Then drain some water, which will come from inside the radiator and not the pipework. Then tighten it back up. Then add the leak sealer and close the bleed valve. Then open both radiator valves to their previous position. Then check and increase the system pressure. Then turn on the heating an the sealer will travel around the whole system.

[@Paul-mg7bh]

@@rikm555 Great, thanks very much