It is important to distinguish between two situations: the device barely moves air, or it moves air but the room does not reach the desired temperature. It also matters whether it has never cooled properly or if it used to work correctly. This comparison helps avoid changing parts or requesting a recharge without knowing the cause.
Check that the equipment is operating in cooling mode.
The ventilation mode moves air without cooling it. The dehumidification mode has a different regulation, and the automatic mode selects its operation according to the unit. Check the manual for the symbol corresponding to cooling and confirm that the setpoint is below the current temperature. Do not use an extremely low temperature as a test: a lower setpoint does not necessarily increase the available capacity.
Also check the programming, power limits, and energy-saving modes that you may have activated. After changing the mode, respect the waiting time indicated by the manufacturer. Daikin includes the configuration and filters among the initial checks.they are general guidelines, not a confirmation of a fault.
Distinguish between flow fault and cooling capacity fault.
If you notice low air output, check that the grilles are not blocked and inspect the accessible filter. Turn off the unit and follow its manual to remove, clean, and reinstall it. Not all filters can be washed or require the same maintenance. Do not disassemble protections, heat exchangers, or electrical components to access them.
The outdoor unit needs to exchange heat with the air. From a safe location, check if there are any furniture, vegetation, or objects blocking its air intakes and outlets. Do not access covers or lean in to inspect it. The maintenance guide for Daikin relate the loss of performance to filters and outdoor ventilation, and refer to assistance when the problem persists.
Interpret the behavior without turning it into a diagnosis.
| What you observe | What should be distinguished? |
|---|---|
| Little air is coming out. | Filter, grilles, and fan speed; if the issue persists, check the ventilation system. |
| Fresh air is coming in, but the room temperature is not decreasing. | Open doors, solar gains, and room demand versus equipment capacity. |
| It was cooling well and has lost performance. | Change of use, pending maintenance, or equipment anomaly. |
| Ice, water leaks, or a fault code appear. | Record the pattern and consult the manual; do not repeat resets or disassemble to search for the cause. |
In a hotter day, a room with more sunlight or more occupants puts more demand on the equipment. If the air comes out cool but comfort is lacking, the sizing and usage conditions should also be reviewed. You can consult our guide to choosing air conditioning to separate types of systems and capacity criteria.
A refrigerant recharge requires a cause and measurements.
Requesting to "turn on gas" before diagnosing limits the search for the problem. The refrigerant carries heat within the circuit; a fault can affect that circuit, the heat exchange, the regulation, or the electrical operation. The professional must identify the model, consult its documentation, and measure under known conditions. An isolated pressure or the sensation of the hand at the outlet do not certify the correct charge.
If there is a leak, the work must address its origin and verify the result. Do not manipulate gas valves or refrigeration connections. If there is a burnt smell, smoke, a tripped electrical protection, or water on electrical components, stop use and request assistance. For specific controls and maintenance, always consult the manual for your model; for example, the Daikin FTXZ-N operation manual it is limited to that family.
What information does a useful technical visit provide?
Send the model of the indoor and outdoor unit, a clear photo of the code if it appears, the mode used, and a brief description: “blows little air,” “cools at first and then stops,” or “only happens in the sunniest room.” Indicate when it started and what external checks you have performed. A specific observation provides more than a hypothesis about the faulty part.
If you need to check the equipment, refer to the Uniclima air conditioning serviceFor more guides, return to the air conditioning blog.
Technical references
Manufacturer sources consulted on October 7, 2026: Daikin's guidance on equipment that does not cool, maintenance recommendations, and the FTXZ-N manual linked in the guide. The specific instructions for the unit take precedence over these general checks.