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- 29 Dec 2020
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I have a Greenstar 24i junior boiler which has been losing pressure for the past 8 or 9 months now it’s worse when heating is on, if I recharge the pressure up to around 1.5bar it will be down to 0 and in the red overnight, I just bought some Fernox F4 express to try and see if that works but the instructions are not very clear is there any way you can put the stuff into the boiler itself rather than into a radiator, I am not the best at diy by the way! Thanks