Hi Emily the boiler may be working ok at the moment but sounds to that your pressure vessel inside the boiler may be at fault as the pressure is raising from 0 to 2 bar there really should be a rais of half a bar . If this is the prob it won't be a major job to repair and £70 for a new vessel (if required) and around £80 for your labour cost
hi emily, have you notice a leak on the system at all ? a pressurised system will only drop in pressure if it is leaking out of the heating system! you operating pressure in a heating system is between 1- 1.5 bars when heating system isn't on but once heated it will it expand half a bar rising to 2 bar which isn't a problem!
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