The unit is running, but the room just isn’t cooling down. Here are the three most common reasons, and how to tell which one you’re dealing with.
1. Malfunctioning Parts
The compressor, motor or capillary can all fail, especially in a unit that’s been running long hours without regular servicing. When any of these components isn’t working properly, the system can’t cool the room effectively, and it usually shows up as both weaker cooling and a higher electricity bill at the same time.
2. Defective Thermostat
The thermostat controls how the system responds to the temperature you set, and if it’s faulty, the unit may run without actually maintaining the cooling you asked for. This is one of the first things worth checking, since it’s a straightforward fix rather than a bigger mechanical issue.
3. Refrigerant Problem
Low or leaking refrigerant is one of the most common causes of a unit that runs but doesn’t cool. Signs of a refrigerant issue include warm air coming from the vents, ice forming on the unit, or a bubbling or hissing sound. This needs a proper leak check, not just a top-up. See our gas top-up guide for why the leak matters more than the refill.
What to Do
Continuing to run a unit that isn’t cooling properly usually makes the underlying problem worse, not better, whichever of the three causes it turns out to be. Book a repair rather than letting it run indefinitely on a lower setting hoping it improves.
FAQs
How do I know which of the three causes it is?
Weak cooling with higher power bills often points to a mechanical issue. No response to temperature changes points to the thermostat. Warm air, ice, or unusual sounds point to refrigerant.
Can I fix a refrigerant problem myself?
No. Handling refrigerant requires licensed equipment, and DIY attempts skip the leak check that actually solves the problem long-term.
Will the problem get better if I just wait?
No, it typically gets worse. Continuing to run a faulty unit puts strain on the other components and can turn a simple repair into a bigger one.
How fast can you diagnose the issue?
Same-day slots are available across Singapore. WhatsApp us the symptom and we’ll advise before you book anything.
