No hot water? Simple checks to diagnose the problem You’ve got into the shower only to realise that the water doesn’t appear to be heating up. It’s common, inconvenient, and frustrating to say the least - but don’t fret, help is at hand. Sometimes it’s not the end of the world when your hot water isn’t working as it should be. That’s why we’ve come up with a few simple checks you can do before you call an engineer. Hopefully in this guide, you’ll be able to find out what the problem is and the best thing for you to do.