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I've never seen anything like this. The S Trap was blocked with almost a solid lump of carbon that was shiny, lik coal, when I broke it up. Has anybody any idea if there is a fault causing this? Symptoms, lockouts, and listening to the flue outside a sound of gurggling water,inside lots of...

Hi My mother's (82 year old and very skint) boiler is duff. The controller does not have any life. No lights on the panel. I've checked voltage to the board, but it appears that the switch mode PSU is not starting. I didn't check for voltage on the reservoir capacitor, so I don't know which...