User Manual

TROUBLESHOOTING
14-22
LD303 lit, normal cooling or heating mode
operation.
LD301 blinking, LD303 lit, unit in full load
condition. (Not malfunction)
LD301 only blinking, check blink error code as
below.
Replace outdoor PWB
Main. (Communication
circuit abnormal)
Repair the abnormal
portion.
Operate the unit by remote
control or by pushing the
test/service switch button.
Specify the abnormal portion.
Refer above LED 9 times blink.
Is AC220~240V being
supplied to terminal L and N?
Check power supply.
Is DC220~320V being generate? (Measure point
shall refer to label on top of electrical cover)
Replace outdoor
P.W.Bs. (Voltage rectify
circuit abnormal)
Replace outdoor
P.W.Bs. (Voltage sensor
circuit abnormal)
Check if thermistor connector mis or
half insert.
Re-connect the
thermistor.
Check if thermistor wire disconnector
or short.
Replace outdoor PWB
main . (Thermistor sensor
circuit abnormal)
Compressor
temperature rise
check by OH
thermistor.
Re-connect OH
thermistor.
Check if OH thermistor wire
short.
Replace outdoor P.W.Bs
if still cannot fix after
review the
cycle.
Review the cooling cycle.
No
Yes
Compressor
stop
Electrical
assembly
abnormal
Abnormal other than electrical assembly
Below AC170 or
more than AC240V
Yes
Yes
Abnormal
AC170~230V
No
Normal
Abnormal
Yes
Abnormal
Yes
LD301 1 time blinking.
Reset stop
Confirm blinking times of LD301
Compressor start
LD301 9 times blinking.
Communication error
LD301 10 times blinking.
Supplied voltage error
Normal
LD301 7 times blinking.
Thermistor abnormal
No
Change thermistor.
Normal
OH thermistor
temperature
rise
LD301 6 times blinking
No
Check if OH
thermistor
connector mis
or half insert.
Abnormal
Normal
Change OH
thermistor.
Abnormal
Overload lower limit cut
LD301 5 times blinking Compressor
load heavy
causing
operation
stop.
Cooling: Is the outdoor unit
heat exchanger pipe choke or
condenser block by
something?
Heating: Is the indoor unit
heat exchanger pipe choke or
filter block by dust?
Countermeasure
the cause of the
problem.
Check the
abnormal
portion.
Is there any abnormality to the cooling cycle.
Yes
Yes
No
Yes
No