Robmurphy1 Posted October 15, 2023 Share Posted October 15, 2023 I’ve come to drain down my Alde compact boiler but when I turn the blue knob on the top of the drain control the blue button isn’t popping out so I am unable to drain the boiler, any advice would be greatly appreciated Quote Link to comment Share on other sites More sharing options...
Steve928 Posted October 15, 2023 Share Posted October 15, 2023 Try it with the system pressurised by the water pump, if you haven't already; the button pops out more easily if there is pressure in the system. Quote Link to comment Share on other sites More sharing options...
Derek Uzzell Posted October 16, 2023 Share Posted October 16, 2023 This (French) video reveals the guts of Truma's "Frost Control" valve, explains how it functions and shows how the button mechanism operates. https://www.youtube.com/watch?v=GaNUXQlw0No&t=3s Quote Link to comment Share on other sites More sharing options...
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