Obh621 - Mitsubishi Electric MS-GF20VA-E1 Service Manual

10-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit oper-
ates.
Outdoor unit
does not operate.
Outdoor unit Outdoor unit
operates only does not
in Test Run operate even
operation. in "Test run
operation".
Check room 1. Check
the wiring
temperature
thermistor. diagram of
the outdoor
Refer to 10-7.
unit.
"Test point
diagram and 2. Check the
outdoor
voltage".
fuse.
Upper lamp Upper lamp
2-time fl ash 3-time fl ash
Cause: Cause:
Indoor unit Indoor unit
• Trouble • Trouble of
of room indoor fan
temperature motor
/ indoor coil
thermistor
Check room Refer to
temperature 10-6.
thermistor "Check of
and indoor indoor fan
coil thermis- motor".
tor. Refer to
10-7. "Test
point diagram
and voltage".

OBH621

Indoor and
outdoor unit
do not operate.
Check the
indoor fuse
(F11), outdoor
fuse (F) and
the compres-
sor contactor
(52C).
Upper lamp Upper lamp
4-time fl ash 14-time fl ash
Cause: Cause:
Indoor unit Outdoor unit
• Trouble • Troubles
of indoor regarding
unit control refrigerant
system circuit
Replace the Refer to 10-4
indoor elec- No. 4 "Rem-
tronic control edy".
P.C. board.
Indoor unit does
not receive the
signal from re-
mote controller.
Indoor unit Indoor unit does
operates, when not operate, when
EMERGENCY EMERGENCY
OPERATION OPERATION
switch is pressed. switch is pressed.
1. Check indoor/out-
Refer to 10-6.
door connecting wire.
"Check of remote
(Check if the power is
controller and
supplied to the indoor
indoor electronic
unit.)
control P.C. board".
2. Check the outdoor fuse (F).
3. Refer to 10-6.
of indoor P.C. board
and indoor fan motor".
"Test Run operation" means the
operation within 30 minutes af-
ter EMERGENCY OPERATION
switch is pressed.
If blinking of OPERATION INDI-
CATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Refer to outdoor unit service manual.
18
OPERATION INDICATOR
lamp on the indoor unit is
fl ashing ON and OFF.
"Check