Try the shraeder valve on the expansion vessel screw the cap of and touch the needle if water then your diaphragm is burst you can also put a tyre gauge on to check the pressure , the prv will blow off at 3 bar so with you topping up to 3bar as soon as it heats up the water will blow off, as said above put a plastic bag or dish under the blow off discharge pipe outside and see if any water evident that after running the boiler, if not then a leak and you then have to find it
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Robert
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