Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 214 / 1106

212
SCM-HG (2 room)
Indoor unit indicator
RUN lamp
1 time flash
2 time flash
6 time flash
Keeps flashing
Keeps flashing
Comes on
Comes on
Comes on
Comes on
Comes on
Comes on
Comes on
Comes on
Comes on
Comes on
Comes on
1 time flash
2 time flash
1 time flash
2 time flash
2 time flash
3 time flash
5 time flash
6 time flash
2 time flash
2 time flash
Stays off
Stays off
Stays off
Stays off
Stays off
1 time flash
2 time flash
3 time flash
5 time flash
6 time flash
7 time flash
Comes on
TIMER lamp
Outdoor unit
indicator
(LED 2)
Description of
trouble
Cause Conditions of flashing
On for 4 sec-
onds and off
for 4 seconds
Outdoor heat exchang-
er fluid pipe thermistor
error
Heat exchanger ther-
mistor error
Room temperature ther-
mistor error
Outdoor temperature
thermistor error
Current cut
Comp. dome thermis-
tor error
Current safe stop
Over heat of compressor
Error of signal trans-
mission
Compressor lock
Outdoor fan motor error
Indoor fan motor error
Broken comp. dome thermistor
wire
Connector poor connection
When heat exchanger thermistor temperature of
–20
°
C or under continued for more than 3
seconds while operation is stopped. (This is not
displayed during operation.)
When room temperature thermistor temperature
of –20
°
C or under continued for more than 3
seconds while operation is stopped. (This is not
displayed during operation.)
When air conditioner is operating and indoor fan
motor is turned ON, indoor fan motor speed of
400 rpm or under continued for more than 30
seconds. (Air conditioner stops.)
When outdoor temperature thermistor temperature
of –40
°
C or under continued for more than 3
seconds while operation is stopped. (This is not
displayed during operation.)
When heat exchanger entrance thermistor temper-
ature of –50
°
C or under continued for more than
3 seconds while operation is stopped. (This is not
displayed during operation.)
When an error with the outdoor unit causes an
error stop, or when the input current is measured
at 1 A or less for 3 continuous minutes or more.
(Compressor is stopped.)
When converter output current which exceeds
setting value is detected. (Compressor stops.)
When the actual speed is 28 rps or less and the
current save has operated. (Compressor stops)
After the outdoor unit speed has been 0 rps or more
for 10 continuous minutes and the compressor dome
thermistor has sent a 10 second or more broken wire
signal (less than 7
°
C). (Compressor is stopped.)
When comp. dome thermistor value exceeds
setting value.
(Compressor Stops.)
If serial signal cannot be sent or received for 1
minute and 55 seconds continuously.
Defective compressor
Defective outdoor PCB
•
•
•
•
Overload operation
Overcharge •
•
Gas shortage
Defective comp. dome thermistor •
•
Defective power transistor.
Broken compressor wire
Compressor blockage •
•
•
Defective power supply
Broken signal wire
Defective indoor/outdoor unit
circuit boads. •
•
•
•
•
Defective fan motor
Connector poor connection •
•
When the outdoor unit fan motor operates at 300
rpm or less for 30 seconds or more continuously.
When the motor for the compressor does not turn
a half a turn approximately 0.3 seconds after
it has been started.
Broken heat exchanger thermistor
wire
Connector poor connection
•
•
Broken room temperature
thermistor wire
Connector poor connection
•
•
Broken heat exchanger fluid pipe
thermistor wire
Poor connector connection
•
•
Broken outdoor thermistor wire
Poor connector connection
•
• Defective fan motor
Connector poor connection
•
•
•
Compressor locking
Open phase on compressor output
Shortcircuit on power transformer
Trouble of outdoor
unit
(2) Indication of self diagnosis