thescruff
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Well it's certainly not normall to go that high and suggests a problem.
At about 3bar the boiler will discharge water, which could mean topping up when it cools.
2.3 bar cold is too high and should be lowered to 1-1.5 bar max, but how did it get that high in the first place, is the filler loop disconnected.
Another problem with larger system, and it will depend on the boiler model, but the expansion vessel is sized for about 130 litres anything over that will require an additional expansion vessel.
in other words more info on the system please.
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