Service manual

Self check function
This function is to show defective point by lighting or flickening of the indoor unit power lamp, defrost lamp, or "I FEEL"
monitor lamp (monitor LED). If troubles written in the below table occur during operation, the self check result indicated. The
abnormal point indication disappears by pressing the power on/off button of the remote controller and when the unit is on.
*Before taking measures make sure that the symptom reappears, for accurate troubleshooting
Self Check Table
Abnormal point
Serial signal
lndoor coil
temp.
thermistor
Outdoor
thermistor
(Discharge
RT62)
Indication
POWER DEFROST
:m. 'a:
DDO
I FEEL MONrrOR
Outdoor unit
does not run
lndoor unit power
turns off.
Compressor no
rotating
lndoor unit
power tums off
MS-09 has only N0.2 check function.
1II: Flash
Detect method
1 . When serial signal from
outdoor unit stops for
4
-- 5 sec.
When serial signal stops for
set. after Ist On Of
52C relay by POWER turn-
ing on.
defect
Cause
lndoor Outdoor connec-
tion mis-wiring
Indoor Outdoor connec-
tion disconnecting
Connector rnisconnecting
Indoor electronie control
p. C. board defect
Outdoor P. C. board de-
fect
Electrical parts defect
2. Detects lndoor coil thermis-
tor short or open circuit
every
2 sec. during opera-
tion.
I
@Thermistor defect
' Connector disconnecting
Connector misconnecting
indoor control P. C. board
Steady
OFF
Measures
3. Detects Discharge thermis-
tor open
: more than 10
min. later from compressor
starting up.
Detects Discharge thermis-
tor short
: During Compres-
sor operation.
Check wiring (Visual '
check and conductivity
check)
Check indoor board
Check outdoor board
Check electrical parts
@Thermistor defect
Connector misconnecting
Outdoor P.C. board de-
fect
Check thermistor char-
actor
Reconnect connector
Reconnect connector
Check indoor board
Check thermistor char-
actor
Reconnect connector
Check outdoor board