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By the Al Karama Technical team · Updated November 2026 · 6 min read
In many Dubai towers, cooling comes from chilled water made by a building chiller or a district cooling plant. Your flat has fan coil units (FCUs) in the ceiling, each with a coil, a fan, a valve, a thermostat and a drain tray. If one room or your flat alone is warm, the fault is usually in the FCU or its controls. If the whole building is warm, it’s the chilled water supply.
If your AC has no outdoor unit on the balcony and a thermostat on the wall, you probably live with chilled water cooling. It’s quiet and efficient, but it works very differently from a split AC, and that changes who fixes what when it stops. This guide explains the system and when to call our central AC repair Dubai team.
A large chiller, either in the building’s plant room or at a district cooling plant serving several towers, chills water and pumps it up through pipes called risers. On each floor, branch pipes feed the fan coil units hidden above your false ceiling.
Inside each FCU, a fan pulls warm room air through a filter and across a coil full of chilled water, then blows the cooled air out through the grilles. A motorised valve opens and closes to let chilled water through when the thermostat calls for cooling. Moisture removed from the air drips into a tray and runs away through a drain pipe. The warmer water returns to the plant to be chilled again.
| Problem | Usual cause | Who usually fixes it |
|---|---|---|
| One room warm | Stuck valve actuator, thermostat fault, weak fan motor or a blocked filter | An FCU technician |
| Whole flat warm, neighbours fine | Main valve, blocked strainer or a fault on your flat's branch | Technician, sometimes with building maintenance |
| Whole building warm | Chiller plant or district cooling supply | Building management or the cooling provider |
| Water dripping from the ceiling | Blocked drain tray or line, or sweating pipes | An FCU technician |
| Noise from the ceiling | Worn fan motor bearings or a loose panel | An FCU technician |
| Musty smell | Dirty coil or stagnant water in the tray | Cleaning and sanitising |
The chiller plant, pumps and risers belong to the building or the cooling provider. The FCUs inside your flat are part of the property. For rented homes, Dubai’s tenancy law says the landlord is responsible for maintenance works and repairing defects that affect the tenant’s use during the lease, unless the contract says otherwise. Tenants are expected to look after the property with ordinary care, which includes reporting faults promptly.
In practice, report the problem to your landlord or agent first and check your tenancy contract. Many landlords ask tenants to book a technician and send the invoice.
In buildings that bill cooling by consumption, a valve stuck open can keep chilled water flowing all day, so getting faulty valves fixed can also help your bill.
We open the ceiling access panel, test the thermostat and wiring, check that the valve actuator opens and closes, measure the fan motor and capacitor, clean the filter and coil, and flush the drain tray and line. Most faults are fixed in one visit. For the plant itself, our chiller repair Dubai team works on commercial chillers.
Dirty ducts and grilles can also reduce airflow. See our AC duct cleaning in Dubai service.
We recommend a full FCU service at least once a year, before the summer, and twice a year if your AC runs most of the year. A service covers the filter, coil, fan, valve, drain tray and drain line, and it’s the best way to avoid ceiling leaks and surprise breakdowns in July.
We repair fan coil units, thermostats, valves and drains in Dubai towers, usually the same day. Book a central AC repair near me or call us now.
Have ducted cooling in a villa instead? Read about the hidden dangers of neglecting ducted AC maintenance.
Usually that room’s FCU has a stuck valve actuator, a faulty thermostat, a weak fan or a blocked filter. These are repairable without touching the building’s supply.
Under Dubai’s tenancy law, the landlord is responsible for maintenance and repairs unless the contract says otherwise. Check your contract and report the fault to your landlord or agent.
Every one to two months during summer, and at least twice a year with a full service of the coil and drain.
Yes. A blocked drain tray or drain line is the usual cause. Switch the unit off at the thermostat, catch the water and book a technician to clear the drain.
Fan coil units, thermostats, valves and drains repaired, with a fixed price before any work starts.