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Just a final update to this thread... The problem turned out to be a cracked heat exchanger which was leaking through the condensation trap (hence no visible signs of water). Worcester Bosch replaced the heat exchanger under their fixed price repair service £250, which is less than you can...

I thought I would post an update with the current situation... I decided to attach a bag to the copper vent pipe on the outside wall to check if water was escaping (as I understand, if the PRV is faulty it will vent through this pipe). The bag was attached while the heating was on, and during...

I decided to have a go at checking the vessel on Saturday (once the boiler pressure had dropped to 0 bar). The vessel pressure was about 3 PSI, which I increased to 10 PSI. I then re-filled the boiler pressure to 1 bar through the filling loop and turned the central heating on...

The boiler is a worcester bosch greenstar 35 CDI

Thanks for the response. Is there a how to or anything for doing that? I'm a bit of a novice with boliers...

Hi everyone, I'm hoping someone can advise me on a problem I have with my bolier/CH system. It is a Worcester Bosch Combi Greenstar boiler. Basically, the pressure (as indicated by the boiler) drops dramatically, but ONLY when the central heating is on. During the summer I have no problems...