Mitsubishi MSH-18RV User Manual

53
11-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Outdoor unit
operates in
only Test Run
operation.
Outdoor unit
doesn't
operate
even in
Test Run
operation.
Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage" on
page 67.
Refer to D
"Check of
outdoor unit"
on page 60.
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Refer to F
"Check of
R.V. coil"
on page 63.
Refer to B
"Check of
remote controller
and receiver
P.C. board"
on page 59.

Flash on and
off at
0.5-second
intervals
Cause:
Indoor/
Outdoor unit
• Mis-wiring
2-time flash
Cause:
Indoor unit
• Trouble of
room temp-
erature/
indoor coil
thermistor
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
Refer to G "How to check
mis-wiring and serial signal
error(When outdoor unit
doesn't work)"
on page 64. W1.
Check room
temperature
thermistor
and indoor
coil thermis-
tor.
Refer to
"Test point
diagram and
voltage"
on page 67.
Refer to A
"Check of
indoor fan
motor"
on page 59.
Refer to J
"Check of
outdoor
thermistor"
on page 66.
1. Check indoor /
outdoor
connecting wire.
2. Refer to C
"Check of indoor
electronic control
P.C. board"
on page 60.
1-time flash
Cause:
Indoor/
Outdoor unit
• Trouble of
serial signal
W1.<The case of the trouble of the serial signal>
When the power is turned off and then turned on again, the indication shows “the trouble of mis-wiring”.
MSH-18RV
OB272-2.qxp 02.1.26 1:23 PM Page 53

Mitsubishi MSH-18RV Specifications

General

Brand	Mitsubishi
Model	MSH-18RV
Category	Air Conditioner
Language	English