Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 214

SCM-HG (2 room)
(2) Indication of self diagnosis
Indoor unit indicator
Outdoor unit
RUN lamp TIMER lamp
1 time flash Comes on
2 time flash Comes on
6 time flash Comes on
Keeps flashing 1 time flash
Keeps flashing 2 time flash
Comes on 1 time flash 1 time flash
Comes on 2 time flash 2 time flash
On for 4 sec-
Comes on 2 time flash
onds and off
for 4 seconds
Comes on 3 time flash 3 time flash
Comes on 5 time flash 5 time flash
Comes on 6 time flash 6 time flash
Comes on 2 time flash 7 time flash
Comes on 2 time flash
212
Description of
indicator
trouble
(LED 2)
Heat exchanger ther-
Stays off
mistor error
Room temperature ther-
Stays off
mistor error
Indoor fan motor error
Stays off
Outdoor temperature
Stays off
thermistor error
Outdoor heat exchang-
er fluid pipe thermistor
Stays off
error
Current cut
Trouble of outdoor
unit
Comp. dome thermis-
tor error
Current safe stop
Over heat of compressor
Error of signal trans-
mission
Compressor lock
Outdoor fan motor error
Comes on
Cause
• Broken heat exchanger thermistor
wire
• Connector poor connection
• Broken room temperature
thermistor wire
• Connector poor connection
• Defective fan motor
• Connector poor connection
• Broken outdoor thermistor wire
• Poor connector connection
• Broken heat exchanger fluid pipe
thermistor wire
• Poor connector connection
• Compressor locking
• Open phase on compressor output
• Shortcircuit on power transformer
• Defective power transistor.
• Broken compressor wire
• Compressor blockage
• Broken comp. dome thermistor
wire
• Connector poor connection
• Overload operation
• Overcharge
• Gas shortage
• Defective comp. dome thermistor
• Defective power supply
• Broken signal wire
• Defective indoor/outdoor unit
circuit boads.
• Defective compressor
• Defective outdoor PCB
• Defective fan motor
• Connector poor connection
Conditions of flashing
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 converter output current which exceeds
setting value is detected. (Compressor stops.)
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.)
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 the actual speed is 28 rps or less and the
current save has operated. (Compressor stops)
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.
When the motor for the compressor does not turn
a half a turn approximately 0.3 seconds after
it has been started.
When the outdoor unit fan motor operates at 300
rpm or less for 30 seconds or more continuously.