Skip to content 
Fan Coil Units (FCUs) are widely used in commercial and residential HVAC systems due to their flexibility and efficiency. However, like any HVAC equipment, FCUs may experience occasional issues during operation. In this post, we summarize several common problems and provide practical solutions to help your team troubleshoot and maintain your units effectively.
1. No Airflow from the Unit
Possible Causes:
- Power supply failure
- Malfunctioning thermostat
- Loose or incorrect wiring
- Fan motor not working
Solutions:
- Ensure the power supply is connected properly
- Check the thermostat settings and operation
- Inspect the wiring for any disconnections or errors
- Test the fan motor for faults or obstructions
2. Airflow Is Not Cold
Possible Causes:
- Thermostat not set correctly
- Control valve malfunction
- Y-strainer blockage
- Inadequate chilled water supply
Solutions:
- Verify thermostat cooling mode and temperature settings
- Check if the valve is stuck or unresponsive
- Clean or replace the Y-strainer
- Ensure chilled water is flowing at the correct temperature and pressure
3. Condensate Tray Overflowing
Possible Causes:
- Drain pipe slope is insufficient
- Drain pipe is clogged
Solutions:
- Re-adjust the drain pipe to ensure proper downward slope
- Check for blockages and clean the drain pipe thoroughly
4. Water Leakage from the Piping
Possible Causes:
- Valve or pipe connections are loose
- Y-strainer or flexible hose is cracked or damaged
Solutions:
- Tighten all valve and pipe connections
- Inspect the Y-strainer and flexible connections; replace if damaged
Final Tips:
Regular maintenance is key to ensuring long-term performance and reliability of your fan coil units. Always perform checks during installation and seasonal startup, and ensure that your technicians are trained to identify early signs of failure.
For more technical support or to learn about our customizable FCU models, contact us at:
🌐 www.hantherm.com
📧 export@hantherm.com
