24
9-3. INSTRUCTION OF TROUBLESHOOTING
Indoor unit oper-
ates.
Outdoor unit
does not operate.
Indoor unit does
not receive the
signal from re-
mote controller.
OPERATION INDICATOR
lamp on the indoor unit is
fl
ashing ON and OFF.
Outdoor unit
operates only
in Test Run
operation.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Indoor unit does
not operate, when
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to 9-7.
"Test point
diagram and
voltage".
Refer to 9-6.
"Check of remote
controller and
indoor electronic
control P.C. board.
1. Check indoor/out-
door connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Check the outdoor fuse (F).
(
MS-GK24VA/GK30VAT
)
3. Refer to 9-6. "Check
of indoor P.C. board
and indoor fan motor".
Upper/Left
lamp 2-time
fl
ash
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
MS-GK36VAT
Left lamp
Flash ON
and OFF at
0.5-second
intervals
Cause: In-
door/ Out-
door unit
• Miswiring
or trouble of
serial signal
Upper/Left
lamp 3-time
fl
ash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Upper/Left
lamp 4-time
fl
ash
Cause:
Indoor unit
• Trouble
of indoor
unit control
system
Start
Check room
temperature
thermistor
and indoor
coil thermis-
tor. Refer to
9-7. "Test
point diagram
and voltage".
MS-GK36VAT
Refer to 9-6.
"How to
check mis-
wiring and
serial signal
error (when
outdoor unit
does not
work)".
Refer to
9-6. "Check
of indoor fan
motor".
Replace the
indoor elec-
tronic control
P.C. board.
Outdoor unit
does not
operate even
in "Test run
operation".
MS-GK24VA/
GK30VAT
1. Check
the wiring
diagram of
the outdoor
unit.
2. Check the
outdoor
fuse.
MS-GK36VAT
Check the
outdoor unit.
MS-GK24VA/
GK30VAT
Check the
indoor fuse
(F11), outdoor
fuse (F) and
the compres-
sor contactor
(52C).
MS-GK24VA/GK30VAT
Indoor and outdoor unit
do not operate.
"Test Run operation" means the operation
within 30 minutes after EMERGENCY OP-
ERATION switch is pressed.
If blinking of OPERATION INDICA-
TOR lamp cannot be checked, it can be
checked with failure mode recall function.
MS-GK36VAT
Left lamp
6-time
fl
ash
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
MS-GK36VAT
Refer to
"Check of
outdoor ther-
mistors".
Refer to outdoor unit service manual.
MS-GK36VAT
Left lamp
7-time
fl
ash
Cause:
Outdoor unit
• Trouble
of outdoor
control
system
MS-GK36VAT
Replace the
deicer P.C.
board.
Upper/Left
lamp 14-
time or more
fl
ash
Cause:
Outdoor unit
• Troubles
regarding
refrigerant
circuit
Refer to 9-4
No. 8 "Rem-
edy".
OBH734B
