01
Read the pressure display and note whether the heating is cold or running. Your appliance manual gives the correct range for that particular boiler; avoid applying a number from a different model.
02
If you keep needing to add water, arrange an assessment. Frequent pressure loss can indicate a problem that topping up alone will not resolve. Photograph the gauge and any visible leak only if it is safe.
03
Do not remove the boiler casing or adjust internal components. If you are unsure about an instruction in the user manual, stop and ask an engineer.