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Your Heat > Boiler Installations  > How to Diagnose and Fix a Faulty Diverter Valve on a Boiler
diverter valve faulty divert valve boiler

How to Diagnose and Fix a Faulty Diverter Valve on a Boiler

Combi boilers more than 10 years old all seem to have a common problem – a faulty diverter valve boiler. The valve tends to wear out with time and cause major dysfunctions within your central heating system. Knowing that this valve is a vital part of your boiler, you should learn how to diagnose a problem and fix it in case it gets stuck. Experienced Your Heat engineers guide you through this task here.

What Does a Diverter Valve Do?

A diverter valve allows or restricts hot water from flowing through your radiators and taps. One of the most common examples of a diverter valve might be in your shower. With many showers over baths, you can choose whether you want the water to come out of the showerhead or your taps. You also know you should pull up or push down the button or lever to choose between these two options. Well, this button / lever is actually a diverter valve.

If you have a conventional or system boiler, you won’t have a valve. It comes with combi boilers only, as this type of boiler heats the water on your demand. The valve will close when you need hot water on your taps and vice versa if you want to send it to the radiators.

How to Diagnose a Faulty Diverter Valve on a Boiler

  • The water coming out of the taps is lukewarm and never hot.
  • Although the water is hot, your radiators are cold.
  • You can’t get hot water unless you turn on the heating.

How to Fix a Faulty Diverter Valve.

If you have diagnosed the problem with your diverter valve, we highly recommend hiring an expert to fix it for you. A broken or stuck diverter valve can be dangerous to repair on your own. If you contact an engineer, this person will do a check test first to make sure there is a problem with the valve.

Most of the time, the valve simply needs to be re-fitted or cleaned. If the problem is more serious, the engineer will have to replace the whole unit.

Having a professional handle this problem for you can be great for another reason. The engineer can inspect other parts of the boiler and check for signs of wear and tear. If your boiler is still under warranty, the engineer will replace the valve at no cost. However, if the warranty has expired and you have other major problems within the boiler, besides the diverter valve, maybe you should take buying a new one into account.


So if you have faulty diverter valve boiler.  A diverter valve is crucial for your central heating and hot water output. If you know how to read the signs, you will be able to diagnose the problem yourself but also need professional help to fix it. Your Heat engineers are at your service. Book a job today or contact us any time if you have questions about repairing your boiler or buying a new one.

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