Older HDB flats often come with unique air-conditioning challenges, particularly for residents dealing with ageing units. Recognising these typical issues and knowing how to fix them, either yourself or with professional help, can save both discomfort and unexpected repair costs.
Here’s a practical guide to diagnosing and addressing common aircon problems in older HDB blocks.
Poor cooling or weak airflow
It’s frustrating when your aircon doesn’t feel as cold as it used to be. Often this is caused by a dirty filter blocking airflow or low refrigerant levels due to leaks. A quick first step is to open the indoor unit, remove the filter, rinse it under lukewarm water, let it dry completely, and reinstall. Regular cleaning every few weeks can help maintain airflow and cooling efficiency.
If that doesn’t work, you may be experiencing low refrigerant. When the refrigerant doesn’t get used up, it usually means there’s a leak. Only a qualified technician should inspect, detect, and repair leaks and recharge the system, this is part of professional aircon servicing.
Water leakage or drip stains
Water pooling near your indoor unit or staining the wall is a common issue, especially in high-humidity HDB environments. Blocked condensate drain lines often cause leaks. You can try clearing the line yourself by gently flushing with a mix of water and vinegar or using a wet/dry vacuum to remove the blockage.
If the clog persists, it’s best to arrange home aircon repair or deeper servicing to thoroughly clear the drain and prevent recurring leakage.
Unusual noises or vibration
Unwanted rattling, grinding, or hissing noises can make your aircon too noisy and point to several potential culprits: loose screws or debris in the fan, a failing compressor, or a refrigerant leak. First, switch off the unit and check for visible issues—tighten screws, remove debris, and ensure the unit is level. If the sounds persist, particularly grinding or banging, call in professionals; it could indicate motor or compressor failure.
Ice or frost forming on coils
Ice build-up on the indoor coils often arises from dirty filters or blocked airflow, but low refrigerant or fan issues may also be to blame. After thawing the ice, clean the filter and ensure the airflow is clear. If that doesn’t resolve it, professional servicing may be required to check refrigerant levels or clean the evaporator coil.
Short cycling or frequent on-off
An aircon that cycles on and off too quickly, known as short cycling, can be due to restricted airflow (dirty filter), thermostat issues, or mis-sized units. Start with filter cleaning and ensure the thermostat is set appropriately. If the problem persists, consult a technician who can diagnose the root cause and suggest whether a replacement or repair is needed.
Poor drainage or condensation issues
Older HDB blocks often suffer from poor drainage due to compact installations or constrained pipe layouts. Water may back up into the unit or trickle down walls. Ensuring proper drainage involves frequently clearing pipes, maybe upgrading them if they’re old or misaligned. A professional aircon servicing visit can help reset and secure drainage systems.
Electrical problems or blown fuses
Older flats may have outdated wiring or caps that can’t handle modern aircon loads. This leads to tripped circuits or blown fuses. Before proceeding, switch off the unit and inspect the fuse box. If the issue recurs, it’s time to call an experienced technician who can assess the wiring safety and recommend upgrades or fuse replacements.
Accumulation of mould or foul odours
High humidity in older HDB flats creates a breeding ground for mould and odours, especially in filter or coil areas. A thorough cleaning, especially a chemical wash to eliminate mould and bacteria, is often necessary. This not only restores cooling performance but also improves your indoor air quality.
Benefits of regular maintenance
Older HDB units stand to benefit significantly from routine preventative care. Aircon servicing scheduled every three to four months helps catch issues early, be it dirty filters, refrigerant loss, leaks or failing components, boosting efficiency, comfort, and longevity of your system. Consistent maintenance reduces breakdown risks and can offer significant savings in energy use and repair bills.
Conclusion
As HDB flats age, aircon units often develop a range of issues, from weak cooling and leaks to noises, freezing and drainage problems. Many of these can be addressed with basic DIY steps like filter cleaning and ensuring proper drainage. However, for persistent or complex issues, professional diagnosis and repair are essential.
Affordable Aircon Services Pte Ltd stands ready to support residents of older HDB blocks with expert care, from routine maintenance to full-scale repairs. For reliable, safe, and efficient solutions tailored to your home, trust Affordable Aircon Services Pte Ltd as your partner in comfort and peace of mind.
