Welcome to our FAQ section — your go-to resource for common inquiries and helpful answers.
FAQ
Welcome to our FAQ section — your go-to resource for common inquiries and helpful answers.
[FCU] Fan Coil Unit Error Codes (Alarms)
For products manufactured before 2020, the indicator light blinks without corresponding to specific error codes.
For products manufactured after 2020, the blinking pattern matches specific error codes:
X1 – 1 blink: Communication error
X2 – 2 blinks: Indoor temperature sensor error
X3 – 3 blinks: Anti-freezing operation in progress or completed
X4 – 4 blinks: Indoor temperature sensor error
X5 – 5 blinks: Motor rotation failure
X6 – 6 blinks: Drain-related error (drainage issue detected)
Up to 16 units can be configured using a single wired remote controller. The “X” represents the unit number. Hexadecimal notation is used: For example, unit 11 is represented as “A”, unit 13 as “C”, and unit 16 as “F”.
[FCU] Fan Coil Unit Power Issue
If the fan coil unit does not power on, please follow these steps:
Check the circuit breaker inside the room and ensure that the breaker for the fan coil unit is switched on.
Most fan coil units use a plug-type connection. Use a device such as a hair dryer or phone charger to check whether the outlet is supplying power.
When power is newly supplied, the unit’s blade section will open and close briefly, and you may hear slight operational noises.
[FCU] Wireless Remote Control Not Working
If your fan coil unit does not respond to the wireless remote control, please check the following:
Check the remote control batteries. Batteries are consumables and may need replacement if the voltage is low.
You can test the remote control using a smartphone camera. Point the remote at the camera and press a button—if it’s working, you’ll see a flickering light on the screen that’s invisible to the naked eye.
Try testing in a dark room. The remote uses an LED signal, and interference from modern LED lighting or compact fluorescent lamps may prevent proper operation.
Frequent drops may damage internal components. Wireless remotes are not covered under warranty and must be replaced if damaged.
[FCU] Why Isn’t the Cooling as Effective This Year Compared to Last Year?
Fan coil units generate cool air by receiving chilled water from the basement through connected piping. Please check whether chilled water is being properly supplied to the unit.
Ensure the unit is set to cooling mode, then try lowering the temperature significantly to test its response.
Check for clogged filters. A blocked filter can reduce airflow and cooling efficiency.
Open the filter compartment and release air from the copper pipe extension using the coil air vent. This helps remove trapped air from the unit and piping.
Verify the operation of the actuator connected to the unit to ensure it is functioning properly.
[FCU] Why Is Water Dripping from the Ceiling-Mounted Fan Coil Unit When It’s Turned Off?
Dust accumulation is a common cause. Dust particles can flow along the internal coil and collect on the drain pan, obstructing the water level sensor and preventing proper drainage.
Long-term use or contaminated chilled water may lead to corrosion or tiny holes in the coil, resulting in internal leakage.
If windows are open during operation, condensation may form around the air outlet blades, causing water droplets to appear.
Turning off the circuit breaker immediately after stopping the unit may prevent the valve from closing properly. This can lead to condensation throughout the unit, causing water leakage and potential damage.
[FCU] Error Occurs After Replacing Wired Remote Control from Another Room
During construction, each unit is configured according to its specific installation environment. Settings are customized to match the conditions of each space.
The number of units and their configuration must match to ensure proper operation without errors.
If you replace a wired remote control arbitrarily, please contact our service center for assistance.
[FCU] Is There a Dehumidification Function in the Fan Coil Unit?
Our product supports three basic modes: Cooling, Heating, and Fan-only operation.
While a dedicated dehumidification mode is not included by default, you can achieve a similar effect by setting the unit to cooling mode at 18°C with low fan speed. This mimics the function of dehumidification by reducing airflow while cooling.
[FCU] Why Is Cold Air (Summer) or Warm Air (Winter) Not Coming Out During Operation?
If your ceiling-mounted fan coil unit is not delivering cool or warm air as expected, please check the following:
Ensure the operation mode is correctly set to Cooling, Heating, or Fan mode according to the season, and verify that the temperature setting is appropriate.
Contact the building management office to confirm whether chilled water (for summer) or hot water (for winter) is being supplied to the system.
Check if any manual valves on the water supply piping have been accidentally closed.
Observe the unit’s indicator light. If it is blinking, this may indicate a system error—please contact customer service for assistance.
Carefully release trapped air from the coil air vent. Air inside the coil can reduce heating and cooling efficiency.
[FCU] Mold Odor Coming from the Fan Coil Unit
The fan coil unit is made with components similar to those in air conditioners—such as copper, plastic, and styrofoam—and does not contain materials that inherently produce odors.
Mold spores may grow in the water generated during use, and this can lead to a sour smell in a short period of time.
To remove the odor using a general method, do not turn off the unit immediately. Instead, open the windows and run the fan mode for 10–20 minutes to dry the heat exchanger. As it dries, the mold and odor will dissipate.
Running the unit in fan mode all day will not eliminate the smell instantly. The water used during operation must rinse through the coil, and drying time is needed—often longer than the period of use.
Developing a regular habit of drying the unit after use will significantly reduce the likelihood of odor formation.
If the odor is strong and you want a quick solution, consider a full disassembly and cleaning or coil replacement. These options may incur additional costs, so we recommend trying the drying method first.
[FCU] What Problems Can Occur When Power to the Fan Coil Unit Is Cut Off?
Ceiling Cassette-Type FCUs If the automatic shut-off valve is not installed at the inlet/outlet piping—or if power is cut before the valve fully closes—chilled water may continue circulating through the internal coil. This can lead to condensation forming and accumulating in the drain pan. If the water exceeds the pan’s capacity, it may overflow and leak outside the unit.
Other FCU Types These units typically use gravity drainage through lower drain piping. In such cases, water leakage from the FCU is unlikely.
Non-Standard Products For custom or non-standard units, please consult with our service team for specific guidance.
[FCU] Standard Scope of Work and Defect Responsibility for Shinwoo Air Conditioning Fan Coil Units
Shinwoo Air Conditioning is a manufacturing company. Aside from product-related alarms, most defect issues are typically the responsibility of other contractors involved in the installation or system setup.
Cooling/Heating Not Working Fan coil units require a proper supply of chilled or hot water to function effectively. If cooling or heating is not working, the issue often lies with valves or building systems. We recommend checking with the relevant mechanical service team first.
Wired Remote Control Displays “01”, “11”, etc. These codes usually indicate that each unit requires individual configuration during setup. If not properly configured, errors may occur. Please contact the installation team for assistance.
Only Some Units Respond to a Multi-Control Wired Remote This issue is similar to the one above and may be due to incorrect settings or wiring problems. A system check by the installation team is recommended.
[FCU] Estimated Electricity Cost for Continuous Use Over 30 Days
Fan coil units are not high-power-consuming devices. In residential settings, their electricity usage is comparable to that of a standard household electric fan.
While power consumption may vary slightly depending on the unit’s capacity, it is generally safe to consider it similar to a typical fan in terms of energy use.
Cooling energy usage is shared among building residents and is calculated based on actual consumption. The building management office typically handles the distribution and billing of these shared costs.
Management fees may vary depending on building occupancy rates and the temperature settings of the central chiller. Even in units of the same size and usage time, costs can differ from building to building.
[ERV] What Is a Ventilation System (ERV)?
A ventilation system is a device that filters polluted outdoor air—such as fine dust—and supplies clean air indoors, while exhausting contaminated indoor air generated from cooking, appliances, and building materials back outside.
It is also referred to as a heat recovery ventilator (HRV), energy recovery ventilator (ERV), ventilation unit, or air circulation system—all of which describe the same type of equipment.
It is often mistakenly confused with simple exhaust fans used in kitchens or bathrooms. However, those are different product categories and do not perform the same air exchange and filtration functions as a dedicated ventilation system.
[ERV] Important Notes When Purchasing Filters for Residential Ventilation Units
If you need to purchase a replacement filter, please measure the width and height of the filter. Specifications may vary depending on the construction company’s requirements, so accurate sizing is essential.
If the product label (sticker on the unit) includes the filter specifications, simply provide that information when placing your order to ensure compatibility.
[ERV] Difference Between Ventilation Units and Air Purifiers
Exchanges indoor and outdoor air through heat recovery, filtering fresh outdoor air and exhausting polluted indoor air.
Removes CO₂ generated by occupants, improving indoor air quality.
Air is distributed through ductwork installed in the ceiling, ensuring even circulation.
Even during seasons with large temperature differences, it provides ventilation without significant heat loss thanks to energy recovery.
Primarily designed to remove indoor pollutants, especially fine dust and odors.
Circulates and filters only indoor air; it cannot remove or exhaust CO₂.
Cannot introduce fresh outdoor air into the room.
