066 067
_TROUBLE SHOOTING GUIDE BOOK _
3.1 Reach target high pressure
3. Lack of Heating
Checking Item Symptom Judgment Countermeasure
The degree of
subcooling of
indoor unit
≥ 10 ℃
Refrigerant overcharging Check the amount of refrigerant
Heating overload
Recheck the load design, Check the
ambient air flow, (if duct type) inlet /
outlet chamber installation
Defective temp. sensor of indoor unit
Check the temperature sensor of
indoor unit
Defective EEV of indoor unit Check the indoor unit EEV
Defective installation of indoor unit
Check the indoor installation environ
-
ment
※ The degree of subcooling of indoor unit (It may be different depending on the outdoor unit control)
> 5 ℃ : EEV Open
< 5 ℃ : EEV Close
2.2 Not reach target low pressure
Checking Item Symptom Judgment Countermeasure
Comp. max
Hz operation
Not reach the target
low pressure under
full / partial / single
operation
Bypass by defec
-
tive outdoor valve
Check the outdoor valve
Not reach the target
low pressure under
full operation, but
reach the target
low pressure under
partial operation
Lack of outdoors
capacity
Not max Hz
operation
Compressor
protection control
operation
Fan. max RPM
operation
Compressor opera
-
tion limit by exces-
sive high pressure
drop
High outdoor
temperature
Defective installa
-
tion of outdoor unit
Check the outdoor installation environment
Excessive foreign
substance of
outdoor heat
exchanger
Remove the foreign substance
Not max. RPM
operation
Not reach max.
RPM under max.
RPM display on the
LGMV
Difective of fan
motor, motor shaft,
fan fixing screw,
fan balance and
fan breakage
Fan heatsink tem
-
perature limit
Check the amount of thermal grease between
the fan PCB and the heat sink.
Fan lock
Remove foreign substance around the fan
operation.
※ Compressor operation : The compressor controls the Hz to reach the target low pressure during the
cooling operation.
- If the compressor does not reach the target low pressure while the compressor is operating at Max.
Hz, the outdoor capacity is insufficient compared to the indoor load or the flow is bypassed.
- If the compressor is not in Max Hz operation, it is in emergency control to limit compressor operation.
※ Fan operation : During cooling operation, the fan controls the RPM to match the target high pressure.
- If the present high pressure is higher than the target high pressure, the RPM is raised.
- If the present high pressure is lower than the target high pressure, the RPM is decreased.
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