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Immersion fault

Intergas ov

Its not a pump its a circulator its not meant to develop pressure ,iwould not expect to see much if any gain in pressure, if the pipe gets hot behind the pump its working.

With this boiler you could be chasing a red herring, to any boiler boiler techs i refer to f:7 faults ,"aps failing to make".........

Check the filter on the return valve behind the chrome nut.

Anti-vac traps

Is the pump wired directly to the boiler via a pump overun some 10.16s had this option fitted.

Electrical fault, clock powers boiler on hot water and heating, on hot water only clock only powers boiler and the hot water runs on gravity. On h/w +htg the clock powers the pump via the roomstat. On old gravity systems you cannot run the htg separately from the hot water.

If you are worried about pressuring your rads install an open vented combi, but your hot water system will be at mains pressure as with any combi.