Please help. I am having a disaster. My shower died on thursday and now my water is not heating up. I have an old 'council' central heating system with gas back boiler. homewarmer elegant. The boiler is firing up ok the pipes and wall leading to hot water tank are hot but the water that comes out isn't. Any suggestions that I could try or do I really need an engineer? This has priority as I am too skint at moment to replace shower.