Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 170 / 1106

168
SCM-HG (4 room)
(2) Indication of self diagnosis
High pressure
error
Indoor unit indicator
RUN lamp
1 time flash
2 time flash
5 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
Comes on
Comes on
1 time flash
2 time flash
1 time flash
2 time flash
2 time flash
3 time flash
4 time flash
5 time flash
6 time flash
2 time flash
2 time flash
Stays off
Stays off
Stays off
Stays off
Stays off
Stays off
1 time flash
2 time flash
3 time flash
4 time flash
5 time flash
6 time flash
(3)
7 time flash
Keeps flashing
Heat exchanger
thermistor error
TIMER lamp
Outdoor unit indicator
(LED2)
Description
of trouble
Cause Conditions of flashing
On for 4 seconds
and off for 4
seconds
Outdoor heat
exchanger gas
pipe thermistor
error
●
Broken heat exchanger
thermistor wire
●
Connector poor connection
●
Compressor locking
●
Open phase on compressor
output
●
Shortcircuit on power
transformer
●
Broken power transformer
●
Broken compressor wire
●
Compressor blockage
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 tempera-
ture 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 sensor tempera-
ture 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
temperature of –50
°
C or under continued
for more than 3 seconds while operation is
stopped. (This is not displayed during opera-
tion.)
When the input current of 1 A or less is detect-
ed for 30 continuous seconds or more. (Com-
pressor stops.)
When converter output current which
exceeds setting value is detected.
(Compressor stops.)
When the input current value exceeds the set
value. (Compressor stops)
When the discharge pipe thermistor tempera-
ture measures an interrupted signal (less than
7
°
C) of 10 seconds or more.
When power transistor temperature exceeds
setting value.
(Compressor Stops.)
When discharge pipe thermistor value
exceeds setting value.
(Compressor Stops.)
If serial signal cannot be sent or received for
1 minute and 55 seconds continuously.
●
Defective power supply
●
Broken signal wire
●
Defective indoor/outdoor
unit circuit boads
●
Power voltage defect
●
Condenser defect
●
Power transistor defect
63H motion
Float switch motion
When DC voltage is 130 V or less.
●
Broken room temperature
thermistor wire
●
Connector poor connection
●
Drain at reverse gradient
●
Float switch defective
●
Defective fan motor
●
Connector poor connection
●
Broken outdoor thermistor
wire
●
Poor connector connection
●
Broken heat exchanger gas
pipe thermistor wire
●
Poor connector connection
●
Broken discharge pipe
thermistor wire
●
Connector poor connection
● Overload operation
●
Overcharge
●
Cooling problem
●
Gas shortage
●
Defective discharge pipe
thermistor
● Overcharge
●
Short circuit
Room temperature
thermistor error
Drain
abnormality
(1)
Indoor fan
motor error
(2)
Outdoor
temperature
thermistor error
Current cut
Trouble of
outdoor unit
Discharge pipe
thermistor error
Over current
Over heat of
power transistor
Over heat of
compressor
Error of signal
transmission
Power source
low voltage
Notes (1) Ceiling recessed type only
(2) Wall mounted type only
(3) LED 2 will go out when even one unit is operating properly or there is an abnormality with the outdoor unit power supply. It will also go out during
normal operation.