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Is that pretty self explanatory kevplumb? On removing the front panel and unscrewing the inside panel... how do i locate the switch?

Hi all, I have a potterton puma 80 and the low system pressure light keeps coming on. I have bled radiators and re-pressurised the system to about 1 bar and it stays stable but the light remains on. It did the same thing about a month ago but managed to 'right' itself. I'm not sure how long...