Umair Gaines
A sour smell from an electric furnace is often caused by bacteria build-up on the heating system coils. This can happen when the coils cool down and reheat, creating a moist environment for bacteria to grow. However, a sour smell could also indicate a more serious problem, such as a failed heat exchanger, which can release unsafe levels of carbon monoxide. Other potential causes of a persistent sour smell include a blocked chimney, a dirty oil filter, or a malfunctioning blower motor. If the smell is accompanied by a burning odour, it could be a sign of electrical burning, which is extremely dangerous and requires immediate attention.
| Characteristics | Values |
|---|---|
| Smell | Sour, rotten eggs, burning dust, burning plastic, electrical burning, metallic, musty, dirty socks, sulphur |
| Cause | Bacteria, dust, melting plastic wire casing, overheated blower motor, gas leak, sewer lines, mould and mildew, blocked chimney, oil filter needs cleaning, failed heat exchanger |
| Action | Turn off the furnace, contact a technician, ventilate the house, pour water down the floor drain, change or clean the filter, call the gas company, call the fire department |
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Burning dust or plastic
If your electric furnace smells like burning dust, it could be because dust has accumulated inside it over the summer. When you turn on the furnace, the dust burns off the heating elements, creating a funky smell. This smell usually doesn't last long. However, if it persists, it could indicate a more serious problem.
Burning dust can also be caused by clogged filters that have accumulated dust, dirt, and other allergens. These clogged filters cause the dust to flow through the ductwork and into your home along with the heated air.
On the other hand, if your electric furnace smells like burning plastic, it could be a sign of a serious problem. This smell is often caused by melting plastic wire casing due to an electrical malfunction. It could also indicate that electrical components and/or wires are getting scorched. In such cases, you should shut off your furnace and contact an HVAC technician for repair.
A burning plastic smell could also be a result of an overheated blower motor. Most furnaces are designed to shut themselves down if they overheat. However, an electrical or mechanical issue may prevent this safety feature from functioning properly.
In summary, while a burning dust smell from your electric furnace is usually not a cause for concern, a burning plastic smell often indicates a more serious issue that requires professional attention.
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Gas leak
If your electric furnace smells sour, it could be a gas leak. Natural gas is odourless, so gas companies add a chemical called mercaptan, which smells like sulphur or rotten eggs, to alert you to a gas leak. If you smell this, you should shut off your furnace and gas valve immediately and leave your home. Then, call 911 and your gas company or local utility company. Do not attempt to fix the issue yourself.
You may also notice other signs of a gas leak. The pilot light on your furnace should always burn blue. If the flame is orange or yellow, it could indicate that your unit is producing deadly carbon monoxide. You may also hear a hissing sound from around your furnace, indicating a faulty connection that is allowing gas to escape. Another sign of a gas leak is if your houseplants are dying.
If you suspect a gas leak, it is essential to act quickly. Evacuate your home immediately and go to a safe distance. Once you are safe, call emergency services or your local gas or utility company. Do not turn on any electrical devices, including light switches, as they can ignite the gas. Wait for professionals to arrive and inspect your home for harmful gases. They will locate and repair the leak to ensure your home is safe before you return.
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Electrical burning
An electrical burning smell coming from your furnace is a serious concern and should not be ignored. This smell could indicate that your furnace motor is overheating, or that there is a cracked heat exchanger. The heat exchanger is an important component that safely exhausts carbon monoxide, a colourless and deadly gas, from your furnace. If the heat exchanger is cracked, carbon monoxide can leak into your home.
Other potential causes of an electrical burning smell include overheated blower motors and melting plastic wire casings within the HVAC system. These issues are safety hazards and can lead to house fires. If you detect an electrical burning smell, it is crucial to take immediate action by turning off your furnace and contacting a professional HVAC technician.
It is worth noting that not all furnace smells indicate a problem. For example, a mild and transient burning dust smell is common at the start of the heating season due to accumulated dust burning off. However, persistent or strong smells, such as burning plastic or electrical burning, could indicate severe issues.
To prevent issues like electrical burning smells, regular furnace maintenance is essential. This includes cleaning or replacing the furnace air filter, which can help reduce the occurrence of unpleasant smells and improve the efficiency of your heating system.
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Bacteria
A sour smell from your electric furnace could be due to bacteria buildup on the heating system coils. This usually happens when the coils cool down along with the outdoor temperature and then reheat when you turn up the thermostat. The constant temperature fluctuations create condensation, which provides the perfect moist environment for bacteria to grow. This bacteria buildup can result in a dirty sock smell or a sour sweat odour, similar to the one you might encounter in a locker room.
If your furnace smells like dirty socks or sour sweat, it is recommended to call a technician to address the issue. While this smell is typically attributed to bacteria, it may also indicate a problem with your sewer lines. If you suspect that the issue lies with your sewer, try pouring water down the floor drain in your basement. If this does not resolve the problem, you may have a sewer leak and should contact a company specialising in sewer line repair.
It is important to address any unusual smells coming from your furnace promptly, as they can indicate a more serious problem. For example, a burning smell could suggest that your furnace or its blower motor is overheating, potentially leading to a house fire. Similarly, a rotten egg smell often signifies a gas leak, which can be highly dangerous and even life-threatening. In the case of a gas leak, turn off your furnace, exit your home, and contact a professional or your local gas company for assistance.
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Blocked chimney
A blocked chimney can cause a burning smell to emanate from your furnace. The purpose of the flue is to draw air up through the furnace and out into the atmosphere. However, if the chimney is clogged, smoke can be redirected back into the ductwork and build up inside your house.
Chimneys can become blocked by bird nests, leaves, twigs, and other debris. Birds and rodents may also nest in chimneys, causing blockages. If you notice a burning smell, you should check for animals or nests in or around your chimney. If the smell is mild, opening windows can help ventilate your home. However, if the smell is strong, you should evacuate your house until the source of the smell is identified. Even with a mild smell, it is recommended to have a professional inspect your furnace to prevent the issue from worsening.
A blocked chimney can also cause an electrical burning smell, indicating that wiring or other components are melting. This can be a safety hazard and should be addressed immediately. Turn off your furnace and contact a technician to resolve the issue.
In addition to the burning smell, a blocked chimney can result in a musty odour. This usually indicates moisture trapped inside your furnace. If the smell is mild or dissipates within a few hours, there is typically no cause for concern. However, if the smell persists, it could signify mould growth inside your furnace, which can be hazardous to your health. In such cases, it is recommended to have your furnace inspected and cleaned by a professional.
It is important to address any potential blockages in your chimney to prevent smoke and odours from entering your living space and to ensure the safe and efficient operation of your furnace.
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Frequently asked questions
A sour smell could be caused by bacteria building up on your heating system coils. This can happen when the coils cool down and heat up again, creating a moist environment for bacteria to grow.
If the smell is persistent, it's best to call a technician to get it checked out.
Yes, a burning smell could indicate an electrical problem. Turn off your furnace and call a technician immediately if you smell burning plastic, rubber, or an electrical burning smell.
A gas leak will likely smell like sulfur or rotten eggs due to added mercaptan chemicals. If you suspect a gas leak, turn off your furnace, exit your home, and call a professional or your gas company.
Try pouring water down the floor drain in your basement. If that doesn't work, call a company that handles sewer line repairs as you may have a sewer leak.
