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Boiler losing pressure

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?

The test, is it not leaking water whilst ever the pressure measure at approximately the same height as the PRV, at any pressure less than 3bar. If it leaks at less, then it is either faulty, or jammed open by some dirt.
 

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