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After bleeding the radiators the pressure on the boiler dropped below 1 bar. I had to partially refill the boiler. I realised then that water was escaping through the vent hole on the cap of the aav. I tightened the cap to stop the leak. Now I find, when the CH is on, that the water pressure is...

Hi I have a Baxi Combi Instant 105e. Originally it was providing DHW to 3 areas, central heating & underfloor heating (UFH). For years it has shown a gradual loss of pressure from 2 – 0.5 over a 2 – 3 week period. Now the system only provides DHW to 2 areas and to the UFH in 2 rooms...