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Thanks. I'll have the guy who installed it over for a look at that auto air vent. It's leaking at a rate of approximately 1 litre every 6 hours now.

I understand from the previous posts here that I would need to repressurize the system using the filling loop. Is that the one I've found here?

I've recently moved in to an apartment which has a Potterton Suprima 50 Central Heating system. Now the last few weeks the system has started performing poorly, with several lock-outs (red led flashing) and the pressure gauge now shows less than 0,5 PSI. I found a small wet patch...