Since a little while, almost every time the burner comes on, a loud banging
noise occurs. Otherwise, everything is running as usual. It did the same
thing a few years ago, but the repair guys found nothing. The noise
disappeared on it's own after wrecking our nerves for a few weeks. This
time, it doesn't want to quit. Needless to say, after the last experience, I
haven't called the repair service yet.
What may cause the noise, how can it be stopped? Any advice is appreciated.
I'm no expert by any shake of the imagination, but I used to tune-up my
Lennox oil furnace for years....had my own Bacharach kit with which to do
It sounds to me as if the oil is coming on and the ignition is a bit
delayed...and then when you finally get ignition, there's a lot of oil to be
burned...and hence the loud bang. This would be one bang....if the banging
continues for a couple of seconds or longer, then you may have poor
distribution of fuel into the combustion chamber....could be caused by the
incorrect spray angle or flow rate of the nozzle or poor adjustment of the
two electrode rodes.
Did you have a reputable oil-furnace service person do a tune-up? Or was it
a fly-by-night guy who doesn't use any equipment....I've experienced
both...and the fly-by-nighters suck. To tune-up an oil furnace (correct
CO2, correct smoke, correct draft, and correct temperature in the stack) one
does need the proper equipment.
Just my 2 cents from about 15 years of tuning my own furnace.
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