Troubleshooting
Fault
Possible Cause
Solution
Abnormal Noise
Supply Air Too
Low
Supply Air Too
High
Air Velocity Too
High
Insufficient
Fresh Air
10. Fan too small.
1. Clean or change filter.
10. Reselect fan.
9. Change deflector.
1. Dirty filter.
2. Check and seal the leakage.
2. Leakage in duct.
3. Clear the air duct or open the air vent.
4. Fan rotates in wrong direction.
5. RPM too low.
5. Change fan motor or pulley.
6. Fan or fan motor undersized.
6. Change fan motor or pulleys.
1. Oversized fan or and motor.
1. Reselect fan or fan motor.
1. Air velocity too high at vent.
1. Extend vent area.
2. Airflow unstable.
Not enough fresh air supply.
1.Fully open fresh air vent.
2. Clean fresh air filter.
2. RPM too high.
2. Change fan motor or pulley.
1. Blower blade or blower shaft loose.
1. Tighten the shaft.
2. Blower or blower housing dirty.
2. Clean blower.
3. Duct or modulating valve loose.
3. Repair duct and modulating valve.
4. Fan belts not align or loose.
4. Align or tighten fan belt.
5. Nuts and bolts for motor, fan or motor
base loose.
5. Tighten the nuts and bolts.
6. Flexible duct at intake / discharge too
tight.
6. Re-adjust the flexible duct. Change if
necessary.
2. Change vent size or add extra
deflector to rectify airflow.
3. Increase cross-sectional area of fresh air duct.
3. Air duct is blocked or air vent is not
open.
4. Reverse the phase of power supply.
9. Deflector too small or duct elbow
over turn to produce noise.
8. Clean the bearing and re-apply lubrication oil.
8. Lubrication is bad or no lubrication.
7. Fan operating point is not optimum.
7. Re-select fan motor or pulley.
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Sakura Air-cooled Split Ducted Air Conditioner
