A strange odour coming from an air conditioner can be unpleasant and concerning. It is not just an issue of comfort but could also indicate underlying problems that require immediate attention. Understanding the causes of these smells and how aircon servicing can resolve them will ensure a fresher and healthier indoor environment.
Musty or mouldy smell
One of the most common reasons for a musty odour is the presence of mould or mildew inside the air conditioning unit. These fungi thrive in damp, dark environments, making the cooling system a perfect breeding ground. When moisture accumulates in the evaporator coils, filters, or ducts, mould can develop and spread, causing an unpleasant smell every time the aircon is switched on.
Regular maintenance, including thorough cleaning of the filters and coils, can prevent mould build-up. Professional servicing ensures that excess moisture is properly drained, preventing future growth of bacteria and fungi.
Rotten egg smell
A rotten egg odour usually signals the presence of dead insects or small animals trapped within the aircon unit. Lizards, rodents, or insects may find their way into the system and become stuck, leading to decomposition and foul smells over time.
To resolve this issue, the unit must be thoroughly inspected and cleaned. Removing the source of the odour and disinfecting the internal components will eliminate lingering smells. Regular servicing can also prevent pests from accessing the system in the first place.
Burning smell
A burning odour from an air conditioner could indicate an electrical fault, such as overheating wires, melting insulation, or a failing motor. Ignoring this smell can be hazardous, as it may lead to a fire or damage the entire unit.
Switching off the air conditioner immediately and contacting a professional for inspection is crucial. Servicing involves checking electrical components, lubricating moving parts, and ensuring all wiring is in good condition to prevent overheating and potential fire hazards.
Sewage-like odour
A sewage smell coming from an aircon unit is often linked to drainage issues. When the condensate drain becomes clogged, stagnant water can produce a foul odour. In some cases, sewer gases may back up into the aircon system if there is a connection between the drainage and the sewage line. Additionally, a low gas level can affect the unit’s operation, potentially causing malfunction and contributing to unpleasant smells.
Clearing blocked drainage pipes and disinfecting the unit will remove the odour. Routine maintenance prevents clogs from forming, ensuring the aircon functions efficiently without any unpleasant smells.
Chemical or sweet smell
A chemical-like or sweet odour often suggests a refrigerant leak. This is a serious issue, as refrigerants are essential for cooling the air. A leak not only reduces the efficiency of the aircon but can also be harmful if inhaled over time.
Servicing involves checking for leaks and refilling refrigerant levels if necessary. If a decrease in cooling efficiency accompanies the smell, a professional technician should inspect the system and determine if an aircon gas top-up is required.
How aircon servicing eliminates odours
Addressing aircon odours requires more than just masking the smell with air fresheners. Proper servicing identifies and resolves the root cause of the issue. Here are some key ways regular maintenance can help:
- Cleaning and replacing filters – Air filters trap dust, dirt, and other particles. If they are clogged, they can harbour bacteria and mould, leading to bad odours. Cleaning or replacing them as part of routine servicing improves air quality.
- Clearing drainage pipes – Ensuring proper water drainage prevents stagnant water, which can produce foul smells and promote mould growth.
- Disinfecting internal components – Using specialised cleaning agents, professionals remove bacteria, mould, and other contaminants from coils, vents, and ducts.
- Inspecting electrical components – Checking wiring and lubricating motors reduces the risk of burning smells caused by overheating.
- Checking for refrigerant leaks – If a refrigerant leak is suspected, a technician will seal the leak and refill the gas to restore the aircon’s cooling efficiency.
Keep your aircon fresh and odour-free
Unpleasant odours from an air conditioning unit are not just a minor inconvenience; they can indicate deeper issues that need prompt attention. Regular servicing is the best way to prevent and eliminate these smells, ensuring a healthier and more comfortable indoor environment.
For expert solutions to aircon odours and comprehensive servicing, contact Affordable Aircon Pte Ltd. Our professional team ensures your aircon remains fresh, efficient, and free from any unpleasant smells.