Boiler not working? Regardless of the make (Worcester, Vaillant, Ideal, Baxi etc.) or type (Combi, System, Central Heating) we can find the problem and get your boiler up and running properly again. Your boiler may not be working all, or it may be working only some of the time. You may not be able to see a pilot light or you can hear a sparking noise but the flame is not igniting inside the boiler. Sometimes ignition problems develop over time with the boiler repeatedly cutting out when the boiler attempts to fire up, other times unexpectedly the boiler stops working suddenly and the boiler will not fire up at all.