GMC GMCAB18, Technical Manual

Page: 4 / 6

4
GMC EVAPORATIVE AIR COOLER –TROUBLESHOOTING
No Malfunction Check Solution
1
No menu on LCD
panel
( only for LCD cooler)
1. Check if cooler is energized.
2. Check if signal wire connection is correct.
3. Check if main control board goes wrong.
1. Plug again and ensure power supply
2. Turn off and re-connect signal wire.
3. Replace main control board or fuse.
2
LCD is out of control
( only for LCD cooler)
1. Check if LCD main control board is burned up.
1. Replace main control board.
2. Replace display panel.
3
Blurry display
( only for LCD cooler)
1. Open controller bottom cover and check if circuit board is
dusty and/or contaminated.
2. Open controller bottom cover and check if circuit board is wet.
1. Clear off dust.
2. Properly blow off moisture.
4
“Er” displayed on
control panel
( only for LCD cooler)
1. Check if temperature sensor has problem. 1. Replace temperature sensor.
5
Cooler stops
automatically after 20
min when cooling
( only for LCD cooler)
1. Check if water level is too low.
1. Increase water pipe pressure.
2. Adjust float valve, make water level 7-10
CM high.
3. Replace water inlet valve.
6
Fan fails to deliver
airflow
1. Check if motor is damaged.
2. Check if fan blades are stuck.
3. Check if LCD main control board is damaged.
1. Replace motor.
2. Adjust fan blades position.
3. Replace contactor.
4. Replace capacitor.
5. Replace LCD main control board.
7
Cooler fails to deliver
cooling air flow
1. Check if there is water in the sump.
2. Check if the water level is too low.
3. Check if pump is in good condition.
1. Increase water pipe pressure.
2. Adjust float valve, make water level 7-10
CM high.
3. Ensure pump wire is connected.
4. Clean pump.
5. Replace pump.
8 Small airflow delivery 1. Check if there is impurity in cooling pads.
1. Clean cooling pads with normal city
water; do not use high pressure water
and any chemical detergent.
9 Drainage valve leaks
1. Check if there is too much impurity in water sump.
2. Check if water level is too high in water sump.
3. Check if drainage valve rubber ring is in good condition.
4. Check if pump is damaged.
1. Clean water sump.
2. Make water level 7-10 CM high.
3. Replace valve rubber ring.
4. Replace pump.