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vaillant boiler no hot water no fault code

Feeling the chill with your Vaillant boiler? Don't worry, no fault code means no problem - we've got the solution for you!


Having a Vaillant boiler can bring comfort and warmth to your home, but what do you do when you suddenly find yourself without hot water? Don’t fret! In this article, we will explore common reasons why your Vaillant boiler may not be producing hot water and how you can troubleshoot the issue without the help of a fault code.

Troubleshooting a Vaillant Boiler: Why is There No Hot Water?

One of the most common reasons for a Vaillant boiler to stop producing hot water is a lack of water pressure. Ensure that your boiler’s pressure gauge is at the correct level, typically between 1 and 1.5 bar. If the pressure is too low, you can easily top it up by following the manufacturer’s instructions. Another possible reason could be a faulty diverter valve, which directs hot water either to the radiators or the taps. If this valve is stuck or broken, it may need to be replaced by a professional.

In some cases, a build-up of limescale in your boiler’s heat exchanger could be the culprit behind the lack of hot water. To remedy this, you can try descaling your boiler using a suitable descaler, following the manufacturer’s guidelines. Regular maintenance like this can help prevent future issues and ensure your Vaillant boiler continues to provide hot water efficiently.

No Fault Code? No Problem! How to Fix Your Vaillant Boiler’s Hot Water Issue

If your Vaillant boiler is not displaying a fault code, there may still be a simple solution to restore your hot water supply. Check that the thermostat on your boiler is set to the correct temperature and that the timer is programmed correctly. It’s also a good idea to inspect the boiler’s condensate pipe for any blockages, as a blocked pipe can prevent the boiler from functioning properly. Clear any obstructions and see if this resolves the issue.

If none of the above solutions work, it may be time to call in a professional for further diagnostics and repairs. They will have the expertise to pinpoint the exact cause of your Vaillant boiler’s hot water problem and recommend the best course of action to get it back up and running. Remember, regular maintenance and timely repairs can extend the lifespan of your boiler and keep it running smoothly for years to come.


Don’t let a lack of hot water dampen your spirits – with a little troubleshooting and maintenance, your Vaillant boiler can be back to providing you with comforting warmth in no time. By following the tips outlined in this article, you can tackle the issue of no hot water without the need for a fault code. Stay cozy and enjoy the convenience of having hot water at your fingertips with your trusty Vaillant boiler!

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