Do you frequently need to re-pressurise? Only pressurise to max 1.5bar and check to see if the pressure rises quickly over 2.5bar when boiler running. If so it could be your expansion vessel at fault.
If th PRV discharges below 2.5 bar, then it's probably got a bit of muck stuck in it,( if you have tested it) keeping the valve slightly open , otherwise it should only discharge above 2.5bar (dependent on it's setting). Check. Otherwise change the PRV again in case the one fitted is faulty.
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