Complete novice so forgive me.
Boiler pressure recently dropped and boiler shut down
Increased pressure as indicated to 1.0 bar (with heating off). When heating come on, pressure goes right up to 2.6 bar, then drops to 2.0 when goes off. Is this normal? Why does instructions say increase to 1.0 for it only to double when in use?
BTW - max pressure I believe is 2.7bar before boiler shuts down.