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Low pressure below 1, Lockout on. won't rest?

Hi I have low pressure and lockout button on. When I try to reset it comes back on in a few minutes. How can I increase pressure please?
Louise M, October 2020
Step 1: tell us what it is you are talking about. I assume it is a central heating boiler, but you NEED TO SAY.
What I don't know is the make and model. Again, YOU NEED TO SAY.

Actually, there is an earlier step you could take: find the manual and read it. You should be able to find it online if you've lost or ignored the one that came with the boiler (or whatever it is)

Not a clairvoyant, October 2020