Boiler Repair Part 2: What’s Causing Your Leaking Boiler

Boiler Repair - Leaky Boiler

If you’re boiler is leaking, it indicates a serious problem that could cause significant damage to your boiler and potentially your home. As soon as you notice a leak, don’t wait to take action. Most leaks can be traced to one of the following problems:

  • Broken seal
  • Corrosion
  • Damaged valves or pump
  • Faulty water pipe connection

Why is your boiler leaking?

Before you call in a boiler repair company or attempt to do the work yourself, you can try to pinpoint the problem on your own. However, it’s important to note that if you have a leak in your gas boiler, you should not repair it yourself. Repairs to gas boilers should only be done by certified gas professionals. We recommend turning off your gas and water supply and call the professionals right away.

Faulty pressure valve

If the leak is caused by a faulty pressure valve, your boiler pressure might be too high. Normal pressure should be between 18-21 PSI, so if yours is above this range, your valve will leak water to prevent an explosion. Sediment can also prevent the pressure valve from closing. You can check this yourself by following these steps:

  • Turn off your boiler and let it cool.
  • Once cooled, lift the manual pressure relief level and let out water for about 3 seconds. The discharged water should come out with some force and appear relatively clean. If water continues to leak out after you’ve closed the valve, sediment could be trapped inside.
  • Repeat this process.
  • If the pressure relief valve still won’t close, close the boiler water feed valve, then remove and replace the relief valve.
  • If no water comes out of the pressure relief valve, the valve is most likely plugged and needs to be replaced.

A problem with the pressure valve could also indicate that the boiler expansion tank is filled with water. You can search for online tutorials for addressing this problem on your own, or you can call us to do it for you.

Faulty temperature valve – If your boiler temperature is reading too high, it can trigger a water leak. A problem with the temperature probe could be to blame.

Corrosion – Corrosion is one of the most common reasons for boiler repair and leaks. Corrosion causes pipes and tanks to weaken over time, allowing water to leak. If the corrosion is concentrated to a valve, the fix could be as easy as replacing the valve. If the corrosion is more extensive, you may have to replace the entire boiler.

Ill-fitting pipes – If you’ve noticed water leaking from around your pipe fittings, the pipes may have been installed improperly. A skilled boiler repair technician may be able to correct the problem but sometimes the damage to the boiler is too severe, so you may have to replace it.

Faulty pump or seals – Sometimes the seals on your boiler pump can come loose, causing a leak. If this is the case, the fix could be as easy as replacing or resealing the pump.

The above boiler leak causes are the most common we see but yours could be the result of other issues. It’s always best to choose a skilled and licensed professional when dealing with something as important as your home’s boiler. Benjamin Franklin Plumbing® offers professional boiler repair and installation. Learn more about our boiler services and give us a call with your questions. We’re here to help.

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