21
10-3. INSTRUCTION OF TROUBLESHOOTING
Indoor unit oper-
ates.
Outdoor unit
does not operate.
If blinking of OPERATION INDI-
CATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Indoor unit operates.
Outdoor unit does
not operate normally.
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.
Outdoor unit
does not
operate even
in Test Run
operation.
Unit does not
operate nor-
mal operation
in COOL or
HEAT mode.
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 10-7.
"Test point
diagram and
voltage".
Refer to "How
to check
inverter/com-
pressor".
Refer to
"Check of R.V.
coil".
Refer to 10-6.
"Check of remote
controller and
receiver P.C.
board".
1. Check indoor/out-
door connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 10-6. "Check
of indoor P.C. board
and indoor fan motor".
Upper lamp
Flash on and
off at 0.5-sec-
ond intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of
serial signal
Upper lamp
2-time
fl
ash
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
Upper lamp
3-time
fl
ash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Upper lamp
4-time
fl
ash
Cause:
Indoor unit
• Trouble
of indoor
unit control
system
Upper lamp
5-time
fl
ash
Cause:
Outdoor unit
• Outdoor
power
system
abnormality
Upper lamp
6-time
fl
ash
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
Upper lamp
7-time
fl
ash
Cause:
Outdoor unit
• Trouble of
outdoor con-
trol system
Upper lamp
14-time
fl
ash
Cause:
Outdoor unit
• Other ab-
normality
Start
Refer to
10-6. "How
to check mis-
wiring and
serial signal
error".
Check room
temperature
thermistor
and indoor
coil thermis-
tor. Refer to
10-7."Test
point diagram
and voltage".
Refer to
10-6.
"Check of
indoor fan
motor".
Replace the
indoor elec-
tronic control
P.C. board.
Refer to
"How to
check
inverter/com-
pressor".
Refer to
"Check of
outdoor ther-
mistors".
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall func-
tion."
"Test Run operation" means the
operation within 30 minutes af-
ter EMERGENCY OPERATION
switch is pressed.
Refer to outdoor unit service manual.
All lamps
Flash on and
off at 0.5-sec-
ond intervals
Cause:
Indoor unit
• The horizon-
tal vane is
not installed
correctly.
Refer to
10-6.
"Check of in-
stallation of
the horizon-
tal vane".
Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy
www.ilmalämpöpumput.com
