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This worked perfectly! Thanks a lot for your help

Thanks for the reply - do you mean the white lever with a bit of black on it in this pic https://imgur.com/0dNPL2k

Hot water and heating not working since last night, flashign 60 light, I read that means low pressure, any idea how I fix this, photo attached, p.s that black circle thing does not budge https://imgur.com/aXa1R1t I can get more photos if needed Taken a couple more https://imgur.com/XH5n39w...