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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...

Thanks for the advice. I've seen what happens today before the loss of pressure. The indicator lights on the boiler were showing the water temperature at 60° but no hot water came out of the tap. Nor did the boiler fire up. I let the hot tap run a while but only got cold water. I left...

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...