0-UC 13-FEB 18-2
Page 21
9
TROUBLESHOOTING CHART
Table 1:
TROUBLESHOOTING CHART
PROBLEM
POSSIBLE CAUSES
CORRECTIVE ACTION
Excessive buildup of
frost on coil.
Defrost time is too short.
Too high humidity in room.
Heater capacity is too small.
Extend defrost time on timer.
Limit access to cooler; do not
keep doors open during stocking.
Change to bigger capacity or add
more heater.
Accumulation of ice or
water in drain pan.
Drain line plugged.
Drain pipe does not have slope
angle.
Indoor unit not align or install in
level at all directions.
Drain line does not have drain
trap
Clean drain line. Make sure drain
line is insulated properly.
Install the drain line with slope
Check unit installation and align
the unit level at all directions.
Install drain line trap.
Noise
Resonance on the vibrating
mounting parts.
Vibration of fan or fan
mounting misaligned.
Fix the position of vibrating part
correctly.
Fix the position of fan correctly;
replace if defective.
Room temperature too
high/ not cold
Room thermostat defect.
Insufficient or no refrigerant
supply to evaporator
Frost build up on evaporator
coil
Defrosting too frequent
Wrong combination of unit:
-Unit cooler is too big against to
outdoor unit
-Unit cooler is too small against
to cooling load
Check thermostat setting and
replace if any.
Check sensor location
Investigate cause (leakage, choking,
etc.), repair fault and charge
system if necessary.
Defrost the coil and clean the frost.
Reduce defrost cycle frequency.
Review and reselect the unit
combination.
