Why Is My Boiler Making a Loud Humming Noise?

| Posted in:  Help Guides/Heating
Boiler Making Loud Humming Noise

If your boiler is making a humming noise, it’s most likely a result of:

- Loose components

- Water pressure that’s too high

- A circulating pump that’s too fast

Below, we’ll look at each of these in more detail, so you can get a better idea of what you need to do to fix it.

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Humming Noise #1: Loose components

If you recently had your boiler installed or repaired, a loose component is a pretty likely explanation for this humming noise.

Our suggestion would be to check out your boiler while it’s humming.

Is the boiler itself vibrating? If so, your boiler is probably not secured correctly to the ground. You should call a technician to come and tighten the boiler’s brackets or install new ones.

If the boiler itself isn’t vibrating but you hear a humming noise, there is likely a loose part on the boiler. Check your boiler’s panel and tighten the screws holding the panel in place. If this doesn’t work, you’ll probably want to reach out to a technician. There may be loose parts within your system, and you’ll need a professional to diagnose and make those repairs.

Humming Noise #2: Water pressure is too high

As you know, your boiler heats your home via heated water. Because your system creates heat this way, pressure (steam) develops in your system.

On average, your boiler’s pressure should never increase beyond 15-20 psi (pounds per square inch). If it does, your boiler will release this pressure via the pressure relief valve.

When pressure is released, it can cause a humming or whistling noise.

To determine if this is your issue, take a look at your boiler’s pressure gauge. If it’s above 20 psi this is likely where the humming/whistling noise is coming from. If you start to notice that your boiler is frequently above 20 psi, you should reach out to a professional, as there is probably another component of your boiler that’s not working the way it should.

Humming Noise #3: Circulating pump is too fast

The circulating pump is the part of your boiler responsible for circulating water from your boiler to the radiator and back again. If the pump is set on too high of a speed, it can create a vibrating or humming noise. The solution? Simply set the circulator pump to a lower speed.

If your boiler continues to heat your home properly, keep your circulating pump on this lower setting. However, if this doesn’t solve your issue or you notice that your boiler isn’t heating your home correctly, call a technician. They should be able to determine what the issue is and fix it.

Still having boiler issues? Hire the Pittsburgh team you can trust: Calfo

If you can’t fix your boiler on your own, feel free to reach out to us. Unlike other HVAC companies, we’ll never try to upsell you on a service you don’t need. We’ll simply take a look at your boiler, accurately diagnose the issue, and make our best recommendation on the repair needed.

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