What Does the Vaillant Fault Code F83 Mean?

January 17, 2021 | Boilers, Vaillant


Vaillant is a Which? Best Buy company that produces a range of boilers to suit all types of living spaces. When installed, the boilers are reliable, quiet and efficient. Your home will be cosy warm, and you’ll have hot running water when you turn on your tap. This will be your experience for the majority of the time with a Vaillant boiler.

However, now and again, something might go wrong, and you may see a fault code. Understanding what fault codes mean allows you to know whether you need to call someone out or you can fix it yourself. 

Why Does Your Boiler Display a Vaillant Fault Code F83?

When troubleshooting your boiler error, you will find that a Fault Code F83 is displayed when the temperature doesn’t increase enough after the burner has been lit. This can happen for several reasons:

  • There could be low water pressure within the system
  • The flow and/or return temperature sensor may be out of calibration 
  • The flow and/or return temperature senor may be incorrectly positioned within the pipe 
  • There could be damaged or loose connections on the wiring loom between the temperature sensor and the main PCB

There may also be low heat input into the heat exchanger within the boiler. This poor performance could be a result of a low gas rate, an incorrectly adjusted gas valve or an issue with the combustion chamber with results in a restricted or poor heat transfer. 

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Do You Need a Boiler Engineer To Fix The Problem?

Knowing what the Fault Code means doesn’t necessarily mean that you will know how to fix it, or even have the skills or tools to fix it if you don’t understand the problem. When it comes to gas boilers, they should only be installed, serviced or maintained by a qualified gas engineer. 

This includes calling someone out when a Fault Code such as F83 is displayed. If your boiler is displaying Fault Code F83, don’t be tempted to try to fix this yourself. 

Prevent a Vaillant Fault Code F83 With Regular Servicing

Whilst there is no way of completely preventing your boiler from ever breaking down or displaying a Fault Code, there are ways that you can help to reduce the likelihood. One of the best ways to ensure your boiler is efficient and reliable is to buy a decent brand with a good reputation. Vaillant has an excellent reputation for being reliable, and so you are off to a good start by choosing this type of boiler.

Another main way to keep your boiler in decent condition and good working order is to have it serviced regularly. It can be tempting to save money and not have regular services, especially if you have had a new boiler installed. 

Choosing a brand such as Vaillant will ensure that you have a good quality boiler. Still, its reliability requires you to maintain the boiler in line with the guidance given, which includes regular servicing. This doesn’t have to be expensive and can be paid as a service plan with a qualified engineer. You might want to save money now, but not servicing your boiler could cost you more in the long term.

A yearly service carried out by a professional Gas Safe engineer will ensure your boiler is safe and efficient. The engineer will check all components of the boiler to make sure they are fully functional and replace any components they may need replacing, as well as clean your system. This will potentially save you money on your bills as well as reduce the risk of developing a fault. 

What You Can Do To Help Prevent Faults

Whilst a qualified gas engineer must carry out all boiler installations, services and repairs, this doesn’t mean there isn’t anything you can do to reduce the risk of developing a fault in your boiler. 

Keeping an eye on your boiler and carrying out regular visual checks will alert you to anything that changes, which means you can have your boiler checked out quickly. If smaller faults develop and go undetected, they can develop into bigger faults. Checking your boiler regularly, keeping on top of your bills so you can see if the efficiency reduces and getting a gas engineer out to look at your boiler as quickly as possible will all reduce the likelihood that a bigger fault will occur. 

Call us today and arrange your boiler service or repair. We cover London and surrounding areas such as Greenford, Mayfair and provide a top-quality service every time. 

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