11844064_sFlue corrosion can be a telltale sign of a faulty boiler.

Find out if your flue has come down with a cold, and determine if a boiler change is in the cards.

The Telltale Sign

Your flue has not been bracketed properly and has water vapor accumulating in the low spots … Wait, say that again?

Imagine you’ve got a flue three meters long, and it’s joined every meter by a bracket. If it’s meant to run three degrees back to the boiler (this is how water gets back to the boiler) but it goes higher or lower than three degrees, water or vapor will catch in the high or low spots, which is where corrosion will begin to appear.

The Solution

  • You’ll need to strip down the flue,
  • Purchase and install a replacement flue,
  • Put in the correct brackets every meter, and
  • Make sure it’s sealed properly.

The Telltale Sign

Your Boiler doesn’t have a proper terminal guard on the outside, which is causing water ingress that leads to corrosion.

The Solution

To fix this you’ll need to replace the flue and the flue terminal, and be sure it’s sealed and in working order.

The Telltale Sign

If it’s not fitted correctly at the flue elbow, a faulty boiler produces overheating and condensation at the flue elbow, which causes corrosion in the flue.

The Solution

To fix this you’ll need to determine the cause of the condensation. Has the flue elbow not been fitted correctly? Has something worn out? You’ll need to strip down the flue and make repairs if possible. However, these are symptoms of an old faulty boiler and it may be time to make a boiler change.

The Telltale Sign

If the boiler is over-gassing and not burning correctly (if your fuel mixture is burning too richly and there’s too much oxygen coming to the boiler) this can cause flames to burn too high, lifting off the burner scorching the inside of the flue, producing carbon residue, and burning holes in the flue.

The Solution

To fix this you’ll need to have the gas valve adjusted. Your boiler then needs to be thoroughly cleaned. Any corroded parts will need to be replaced.

The Telltale Sign

Your boiler is “sooting up,” which means there’s a buildup of soot in the flue. Soot is very corrosive to boiler flues.

The Solution

The boiler needs to be stripped down, and burners and jets need to be cleaned and thoroughly serviced.  Any parts of the corroded flue need to be replaced. Or it could be time for a boiler change.

Flue corrosion can appear as a minor symptom. But chances are it’s telling you something more about your heating system. If you’ve noticed any of these tell-tale signs, get your system checked out. Implement the repairs, and if necessary make a boiler change.

IF YOU REMEMBER ONE THING FROM THIS ARTICLE!

Remember this … These are all common symptoms that it’s been too long since your boiler was last serviced, because a service engineer would have noticed any of these and performed the required maintenance. If you’re noticing any of these symptoms, telephone a gas safe registered engineer and schedule an inspection.

 

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