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Intermittent explosion when gas boiler ignites

KentnDC Member Posts: 2
For the past few weeks, about once every 48 hours, when the gas boiler ignites, rather than turning on quietly, there is an explosion (to shake the house/wake from sleeping) and the boiler ignites. There is a lingering smell... like something burnt.

2 weeks ago, the furnace company came by and cleaned it. It had been 13 months since the last cleaning. The explosions continued. A second service technician came out and could find nothing wrong. He suggested we get our flue checked. The flue man came out and all is well. But the explosions continue.....

It is a Peerless Boiler . The Model number is MI-04-SV (DE-03-SPRK) - it is about 12 years old with regular maintenance.

We had Central Air installed last spring but only cooling, no heat. New themostat was installed at that time.

The techician said he could not fix it if he doesn't see the explosion, but we can't recreate them. Any advice on what might be the problem and what can be done to fix this. It would be greatly appreciated. This all is rather unsettling.


  • Ironman
    Ironman Member Posts: 7,111
    Serious Problem

    You have a problem that needs to be addressed by a KNOWLEDGEABLE tech. There are too many things to list that could be causes. One thing that should be done is to check it when the boiler's cold as well as hot.

    From your handle, it appears that you live in D.C. If that's so, then I recommend that you contact Dan Foley at Foley Mechanical in Lorton, Va. He's listed under the "Find a Contractor" tab above.

    If you're located in a different area, then I'd try the locator tab to find a contractor in your area. Ask whoever you call if they have a digital combustion analyzer and have been trained on it. If not, call another. The analyzer may not be needed to find the problem, but you should have the boiler setup with one. A company that can't do this is NOT the one you want.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Steamhead
    Steamhead Member Posts: 15,887
    Second the recommendation

    for Foley Mechanical!
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
  • unclejohn
    unclejohn Member Posts: 1,810
    You are having

    A delayed ignition problem. The thing is you have to see it to correct it. But it should not take all that long to see it happen.
  • Ironman
    Ironman Member Posts: 7,111


    I didn't know if you wanted to make the drive to D.C. for a service call or if that's outside your normal area? Thirty-some miles down the B.W. Parkway through traffic would seem a little too much for me.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
This discussion has been closed.