Boiler making humming noise


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Old 12-26-17, 06:51 AM
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Boiler making humming noise

Hi everyone,

I have a Beckett AFII 150, about 10 years old. Just yesterday it started to making a hi pitched humming noise, almost like a whistling noise. The thing that perplexes me the most is it only does it after itís been running for 3-4 minutes. Once it completes that cycle, shuts off and begins to run again, it will remain quiet once again for 3-4 minutes, but after that short break it will again make the noise. I do have a diagnostic stethoscope and there seems to be a clicking noise coming from the inlet side but the hum seems to be coming from the exhaust side toward the bottom of the motor.

Any my thoughts on how to even begin diagnosing this are greatly appreciated!
 
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Old 12-27-17, 08:12 AM
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High pitched sounds from an oil burner are usually one of two things:
The easiest & cheapest thing to do is make sure the fuel system is clean by changing the fuel filter & pump screen. You can check the vacuum on the system by installing a gauge in an unused inlet port on the pump. If the gauge shows over 4-5 inches of vacuum & the distance from the tank to the pump isn't excessively long, you could have a restriction in the lines. (Rule of thumb: 1" of vacuum for each foot of lift & 1' for each 10 ten feet of flat run.)

The other common cause of whine is bearings in the motor.
 
 

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