Industrial evaporative air coolers are widely used in factories, warehouses and commercial buildings to improve ventilation and reduce heat.
However, like any mechanical equipment, air coolers may sometimes display error codes or operational problems.
Understanding these error codes helps identify whether the issue can be solved through basic troubleshooting or requires professional repair.
If you are new to this system type, you can also read our guide to industrial evaporative air cooler systems.
Common Air Cooler Error Codes
Modern industrial air coolers use a control panel to monitor electrical faults, voltage abnormalities and motor overload conditions.
The following are common error codes found in many fixed-type evaporative air coolers.
E1 – Over Current
Possible causes:
- Motor overheating
• Electrical wiring fault
• Motor earth wire disconnected
E2 – Over Voltage
Possible causes:
- Incoming power supply voltage too high
• Electrical wiring fault
E3 – Under Voltage
Possible causes:
- Insufficient electrical supply
• Circuit wiring problem
E4 – Current Fault
Possible causes:
- Electrical circuit fault
• Wiring connection problem
F6 – Communication Failure
Possible causes:
- Communication cable fault
• Loose communication cable connection
• Control panel malfunction
E7 – Motor Overload
Possible causes:
- Fan motor drawing excessive current
E8 – 15V Voltage Fault
Possible causes:
- Internal PCB controller fault
Touch Screen Air Cooler Error Codes
Some newer evaporative air cooler systems use touch screen control panels.
Common codes include:
Error Code | Meaning |
01 | Over current |
02 | Communication failure |
03 | Drainage failure |
04 | Water pump failure |
05 | Under voltage |
06 | Over voltage |
These codes help technicians quickly identify faults within the cooling system.
Air Cooler Not Cooling
One of the most common complaints is when the air cooler runs but does not produce cooling air.
Possible causes include:
Cooling Mode Not Activated
If the system is running in VENT mode, it will only provide ventilation without cooling.
Switch the unit to Cooling Mode.
Water Pump Fault
If the water pump fails, water will not circulate through the cooling pads.
Possible causes include:
- Water pump failure
• Dirty cooling pads
If the issue persists, it may require professional air cooler repair service in Malaysia.
Low Water Level
Possible causes:
• Faulty water level sensor
• Float valve malfunction
Water Leaking From Air Cooler
Water leakage can occur under different conditions.
Leakage During Rain
Possible causes:
- Broken ducting
• Air cooler top cover damaged
• Sealant deterioration
Leakage During Cooling Mode
Possible causes:
- Internal water piping burst
• Cooling pad damaged
Continuous Leakage
Possible causes:
- Float valve fault
• Drain valve jammed
No Air Blowing From Air Cooler
If the air cooler is running but no airflow is coming out:
Possible causes:
- Fan blade broken
• Motor wiring fault
• PCB board malfunction
Loud Noise or Strong Vibration
Possible causes include:
- Fan motor bearing wear
• Unbalanced fan blade
• Installation alignment issue
Download the Complete Troubleshooting Guide
For quick reference, you can download the complete air cooler troubleshooting guide which includes:
- Full error code explanations
• Common problems and solutions
• Maintenance recommendations
Download the Air Cooler Error Code Troubleshooting PDF by filling up form below:
When Should You Call a Technician?
If your air cooler repeatedly shows error codes, leaks water or produces abnormal noise, the issue may involve electrical components or mechanical faults.
In such cases it is recommended to contact a professional air cooler maintenance and repair service.
Experienced technicians can inspect the system and prevent further damage.
E1 usually indicates an over-current condition caused by motor overheating, wiring faults or a disconnected motor earth wire.
An air cooler may stop cooling because the water pump is faulty, cooling pads are dirty, water level is too low or the system is running in vent mode.
Water leakage can be caused by broken ducting, damaged cooling pads, burst internal piping, float valve faults or drain valve malfunction.
Noise and vibration may be caused by worn fan motor bearings, damaged fan blades or installation alignment problems.
You should contact a technician if the air cooler repeatedly shows error codes, cannot switch on, leaks water, produces strong vibration or fails to cool properly.