March 13, 2024

How to Conduct a Basic Check on Your Vaillant Boiler

Experiencing a shortage of hot water can be quite inconvenient. The convenience of having hot water readily available is often overlooked until it is no longer accessible, highlighting its importance in our daily lives for comfort and hygiene.

If you are facing issues with your hot water supply, Vaillant is ready to provide assistance. Our comprehensive guide can help you identify the common causes of hot water shortage and guide you on the necessary steps to resolve the issue promptly. Don't hesitate to reach out to us for support in restoring your access to hot water at home.

What Causes Hot Water to Stop Working?

There are numerous factors that may contribute to the occurrence of hot water issues, and a significant portion of them can be attributed to a malfunctioning boiler. To begin troubleshooting, it is crucial to verify the proper functioning of your boiler system. In the event of a faulty boiler, an error code will be displayed on the boiler, indicating the specific fault. It is essential to consult your boiler manual and compare the displayed code to identify the underlying issue accurately.

Conducting Basic Checks

The basic checks that you can perform to see if there is a problem with your boiler are the following:

Gas, Electricity, or Water Supply Problems

A common cause of hot water shortage is the disconnection of power or water supply to the boiler. It is crucial to ensure that the correct fuel is being delivered to the system and that water is flowing from the mains or a storage tank.

Sometimes, these connections can be accidentally switched off or disrupted during a power outage. If you have confirmed that the boiler system is properly connected, it is advisable to check other household appliances for any supply interruptions that may be affecting your hot water.

If the problem persists, it is recommended to seek assistance from a qualified GSR engineer. Power-related issues are often to blame for hot water problems, so it is important to check the boiler display for any signs of power loss and to reset the boiler settings if necessary by inspecting the main fuse box and turning the boiler switch back on.

Water Pressure Problems

Adequate boiler pressure is crucial for the proper operation of the system, ensuring that the appliance can effectively heat water from the mains. If the pressure falls below or exceeds the optimal level, the system will shut off automatically, preventing the distribution of hot water throughout the household.

Monitor the pressure gauge on your boiler to determine if it is within the recommended range. Additionally, modern boilers may display error codes to signal any pressure-related problems. For further information on addressing boiler pressure issues, refer to our comprehensive guide for troubleshooting solutions.

Pilot Light Problems

Gas boilers may stop heating water if the pilot light goes out, a common issue especially in older appliances where a small flame is used to ignite the gas burner. Some boilers allow you to check the pilot light without removing the casing, while others display its status on an electronic screen.

If the pilot light is extinguished, refer to the boiler manual for instructions on safely reigniting the system. If following the manual does not solve the issue, it is advisable to contact a GSR engineer to investigate the problem further, as it could indicate a need for internal part replacement.

Unlike older models, most modern gas boilers do not rely on a pilot light but utilize electronic ignition systems to ignite the gas when needed. Pilot lights are more commonly associated with appliances that are over two decades old.


These are the basic checks you can conduct if your boiler is facing issues. If the problem persists you should readily call a gas-safe registered engineer to resolve your boiler issues quickly and completely.

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We aim to deliver high quality service at a competitive price. Expert Vaillant Boiler Repairs, Servicing, Installation & Powerflushing. Our service motto is to offer an honest, reliable service to all our clients.