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I saw him with another so assuming that was new. Can you test them? Why do I get FH as the code? Is that because the pressure has gone down to zero?

Yes the pipe is copper and sometimes I see it dripping

The issue is that it empties out the pipe outside. When I go to bed the next day it has locked out as gauge reads 0

From 1

When heating on it goes up to 1 and half

Hi, I have had expansion vessel and prv replaced as I keep losing pressure. Water keeps being push outside. Got up this morning and boiler is locked out again and needs topping up. It is a ferorri and has a code of FH. The plumber did not empty the system. FH is giving another reason but would I...