Top best answers to the question «Rattling sound when electric heat comes on»
- That said, if the metal coils of the heat exchanger have a crack or leak, you’ll hear a rattling sound shortly after the furnace turns on. This is because the metal is expanding, which causes a rattling noise. What to do: Contact a professional to inspect your heat exchanger for leaks.
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A bang or rattling sound from your furnace could mean that you have a cracked heat exchanger, which is the biggest cause of carbon monoxide leaks. A rattling sound before the blower comes on almost always means a cracked heat exchanger. Call your heating and cooling professional as soon as you can to fix this problem, which could turn deadly if ignored!
If you have a crack in the heat exchanger, you'll likely hear a rattling noise seconds after your thermostat clicks to turn on the heat. That's because the heat exchanger is made out of metal, so when it’s heated, any cracks in it may start to expand, causing a rattling noise.
Clicking noises are normal when HVAC units turn on and off. If you hear repeated clicking sounds coming from the control panel or outside compressor, a relay may be defective. An electrical control may also be causing the relay to timeout and fail. RELATED: Are HVAC Service Contracts a Waste of Money? 5. Rattling from outside compressor and fan unit When the fan turns on in your compressor unit, it should not rattle. These sounds may be an indication of loose hardware or a failing motor.
A buzzing sound coming from your air conditioner or heat pump points the finger at excessive vibration. Check connecting parts of your unit and tighten any loose parts. If it’s still buzzing, another source could be your unit’s motor, which is usually a symptom that your motor is nearing the end of its life.
With the power off, use your screwdriver to tighten your panel screws. This may end up fixing that rattling sound. If this doesn’t fix the rattling, there could be a more serious and dangerous problem. Rattling can also signify a faulty heat exchanger with a leak or a crack in it.
The rattling noise is most often caused by loose metal ducts that tend to knock against one another. This could be a sign that your ducts have leaks or gaps between them, which will ultimately have a negative impact on the performance and efficiency of your heating system. As ducts age, the connective sealing between them begins to deteriorate or loosen.
This is a warning sound. If it (or a similar sound) is coming from your AC compressor, you need to act quickly and turn electrical power to the unit OFF. It might switch off on its own—which is good. Leave it alone until you can get help. This also could signal a dangerously high refrigerant pressure.
One of the most common noises people complain about when it comes to their furnace is the sound of a boom or rattling. This usually occurs when you start or turn off the furnace, or shortly thereafter. If this is the case, the sound is likely normal and it’s just the effect of the metal ductwork expanding and contracting with the increasing or decreasing temperature.