Mitsubishi Electric MSH-18RV Service Manual page 54

MSH-24/30RV
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit
doesn't
Outdoor unit
operate
operates in
even in
only Test Run
Test Run
operation.
operation.
Check room
temperature
Refer to D
thermistor.
Refer to "Check of
"Test point
outdoor unit"
diagram and
on page 61
voltage" on
or 62.
page 67
or 68.
Flash on and
MSH-24RV only
off at 0.5-
1-time flash
second
Cause:
intervals
Outdoor /
Cause:
Indoor unit
Indoor/
• Trouble of
Outdoor unit
serial signal
• Mis-wiring
Refer to G
Refer to H
"How to
"How to
check mis-
check
wiring and
mis-wiring
serial signal
(When
error (When
outdoor unit
outdoor unit
doesn't work)"
doesn't
on page 65.
work)" on
page 64.
W1
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".
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
Unit doesn't
Outdoor unit
operate
doesn't
normal
stop even
operation in
if indoor unit
COOL or
stops.
HEAT mode.
Refer to E
Refer to F
"Check of
"Check of
outdoor unit"
R.V. coil"
on page 63.
on page 63.
2-time flash
3-time flash
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble of
room temp-
indoor fan
erature/
motor
indoor coil
thermistor
Check room Refer to A
temperature
"Check of
thermistor
indoor fan
and indoor
motor"
coil thermis-
on page 59.
tor.
Refer to
"Test point
diagram and
voltage"
on page 67
or 68.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.
Refer to B
"Check of
remote controller
and receiver
P.C. board"
on page 59.
MSH-30RV only
6-time flash
4-time flash
Cause:
Cause:
Outdoor unit
Indoor unit
• Trouble of
• Trouble of
thermistor
indoor unit
in outdoor
control
unit
system
Replace the Refer to J
indoor
"Check of
electronic
outdoor
control
thermistor"
P.C. board.
on page 66.
54
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
1. Check indoor /
outdoor
connecting wire.
2. Refer to C
"Check of indoor
electronic control
P.C. board"
on page 60.
MSH-30RV only
7-time flash
10-time flash
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Trouble of
outdoor
low discharge
control
temperature
system
protection
Refer to I
Replace the
deicer "Check of
P.C. board. LEV"
on page 66.