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As part of the central air conditioning system, the fan coil unit is responsible for regulating the indoor temperature and humidity, but various faults may occur during use. This article introduces some common faults of the fan coil and their troubleshooting methods in detail to help users quickly solve the problem and ensure the normal operation of the air conditioning system.
Cause analysis: It may be caused by abnormal power supply voltage, fan reversal, obstacles in the air outlet, or valve blocked by foreign objects.
Troubleshooting method: First check whether the power supply and wiring are normal, then remove foreign objects from the air outlet and valve to ensure that the air duct is unobstructed.
Cause analysis: It may be caused by air in the coil, water supply circulation stopped, regulating valve closed, or valve blocked by foreign objects.
Troubleshooting method: Exhaust the air in the coil from the exhaust valve, check whether the water pump is working properly, ensure that the regulating valve is open and remove any blockages.
Cause analysis: It may be that the internal insulation is damaged, the casing is in contact with fire during assembly and the insulation layer is burned, the cold air is leaking, or there are conditions that cause condensation in the room.
Troubleshooting method: Repair or replace the insulation layer, avoid direct contact between the casing and fire, repair cold air leakage, and improve indoor ventilation conditions to prevent condensation.
Cause analysis: It may be poor installation, tilted water tray, blocked drain outlet, water pipe leaks, condensed water drips from the pipe, poor installation at the joint, or the exhaust valve is forgotten to be closed.
Troubleshooting method: Ensure that the unit is installed horizontally, adjust the water tray to a horizontal position, remove obstructions in the drain outlet, check and replace leaking water pipes, and ensure that the exhaust valve is closed.
Cause analysis: It may be due to poor installation of the unit, poor installation of the casing, loose parts of the fan, foreign matter on the air duct, fan motor failure, broken fan blades, loose louvers at the air outlet, air in the coil, too fast flow rate of chilled water (hot water), or too large pressure difference when using a quantitative valve.
Troubleshooting method: Reinstall and adjust the unit, ensure that the casing is firmly installed, tighten loose parts, remove foreign matter on the air duct, repair or replace the motor, replace the fan blades, tighten the louvers, exhaust the air in the coil, adjust the chilled water flow rate, and replace the appropriate valve.
Cause analysis: It may be due to insufficient opening of the regulating valve, blockage of the coil or air filter, insufficient water supply or abnormal temperature, obstruction of the air outlet or return air outlet or improper temperature adjustment, sunlight in the room or open windows.
Troubleshooting methods: Readjust the opening, clean the coil and filter, check the water supply valve, ensure that there are no obstacles at the air supply and return vents, adjust the temperature to a suitable level, and avoid long periods of sunlight or open windows in the room.
