Why is my AC running but not cooling the apartment? (Dubai Marina)
My split AC in Dubai Marina runs constantly but the apartment just won't get cold — it's sitting around 28°C even with the unit set to 19°C. The outdoor unit is running and there's airflow from the indoor unit, just not cold air. It was fine last summer.
Before I pay for a call-out, what are the usual suspects here? Is this a gas problem or something I can check myself?
4 answers
Nine times out of ten in Marina apartments it's one of these three, in order of likelihood:
- Clogged filters / dirty coil. Dust here is brutal. A blocked filter chokes airflow and the coil ices up — you get air, but not cold air. Switch the unit off, pull the front filters, and check if they're grey. Wash them, and look for ice on the copper coil.
- Low refrigerant (gas). If the unit cools for 10 minutes then stops, or the copper pipe at the outdoor unit is frosted, you're likely low on gas — which usually means a small leak, not "gas runs out." That needs a technician with gauges; topping up without finding the leak is throwing money away.
- Failing capacitor / compressor not engaging. If the outdoor fan spins but the compressor never kicks in, the room never cools. That's a pro fix.
Start with the filters tonight — it's free. If they were clean and it still won't cool, book a gas + leak check. For how often to service so this doesn't recur, see how often to service a split AC in the UAE.
Adding a renter's angle: if you're leasing, a cooling fault like this is usually the landlord's or the building's responsibility, not yours. Check your tenancy contract before you pay for gas out of pocket — take a photo of the thermostat reading as evidence.
Filters were absolutely filthy 😳 washed them and there was a thin layer of ice on the coil like you said. Cooling better already. Booking a service to be safe. Thank you!
Adding a note as this comes up every summer — "running but not cooling well" splits into a few distinct causes worth ruling out separately: if it also smells musty, that's a dirty coil/drain; if it keeps starting and stopping, that's short-cycling (often low gas or a dirty coil); and if cooling fades over the season, it's usually a refrigerant leak, not a unit that "needs gas". Match the symptom to the cause rather than guessing.
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