Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 170

SCM-HG (4 room)
(2) Indication of self diagnosis
Indoor unit indicator
RUN lamp TIMER lamp
1 time flash
Comes on
2 time flash
Comes on
5 time flash
Comes on
6 time flash
Comes on
Keeps flashing
1 time flash
Keeps flashing
2 time flash
Comes on
1 time flash
Comes on
2 time flash
Comes on
2 time flash
Comes on
3 time flash
Comes on
4 time flash
Comes on
5 time flash
Comes on
6 time flash
Comes on
2 time flash
Comes on
2 time flash
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.
168
Outdoor unit indicator
Description
of trouble
(LED2)
Heat exchanger
Stays off
thermistor error
Room temperature
Stays off
thermistor error
Drain
Stays off
(1)
abnormality
Indoor fan
Stays off
(2)
motor error
Outdoor
Stays off temperature
thermistor error
Outdoor heat
exchanger gas
Stays off
pipe thermistor
error
1 time flash
Current cut
Trouble of
2 time flash
outdoor unit
On for 4 seconds
Discharge pipe
and off for 4
thermistor error
seconds
Over current
3 time flash
Over heat of
4 time flash
power transistor
Over heat of
5 time flash
compressor
Error of signal
(3)
6 time flash
transmission
Power source
7 time flash
low voltage
High pressure
Keeps flashing
error
Cause
When heat exchanger thermistor temperature
● Broken heat exchanger
of –20 °C or under continued for more than
thermistor wire
3 seconds while operation is stopped. (This
●
Connector poor connection
is not displayed during operation.)
When room temperature thermistor tempera-
ture of –20 °C or under continued for more
●
Broken room temperature
thermistor wire
than 3 seconds while operation is stopped.
(This is not displayed during operation.)
●
Connector poor connection
●
Drain at reverse gradient
Float switch motion
●
Float switch defective
When air conditioner is operating and indoor
● fan motor is turned ON, indoor fan motor
Defective fan motor
speed of 400 rpm or under continued for
more than 30 seconds. (Air conditioner
●
Connector poor connection
stops.)
When outdoor temperature sensor tempera-
●
Broken outdoor thermistor ture of –40 °C or under continued for more
wire
than 3 seconds while operation is stopped.
(This is not displayed during operation.)
●
Poor connector connection
When heat exchanger entrance thermistor
●
Broken heat exchanger gas
temperature of –50 °C or under continued
pipe thermistor wire
for more than 3 seconds while operation is
● stopped. (This is not displayed during opera-
Poor connector connection
tion.)
●
Compressor locking
● When converter output current which
Open phase on compressor
exceeds setting value is detected.
output
(Compressor stops.)
●
Shortcircuit on power
transformer
●
Broken power transformer
When the input current of 1 A or less is detect-
● Broken compressor wire
ed for 30 continuous seconds or more. (Com-
pressor stops.)
●
Compressor blockage
●
Broken discharge pipe
When the discharge pipe thermistor tempera-
thermistor wire
ture measures an interrupted signal (less than
7 °C) of 10 seconds or more.
● Connector poor connection
When the input current value exceeds the set
●
Overload operation
value. (Compressor stops)
●
Overcharge
When power transistor temperature exceeds
●
Cooling problem setting value.
(Compressor Stops.)
● When discharge pipe thermistor value
Gas shortage
exceeds setting value.
●
Defective discharge pipe
(Compressor Stops.)
thermistor
●
Defective power supply
● If serial signal cannot be sent or received for
Broken signal wire
1 minute and 55 seconds continuously.
● Defective indoor/outdoor
unit circuit boads
●
Power voltage defect
●
Condenser defect
When DC voltage is 130 V or less.
●
Power transistor defect
● Overcharge
63H motion
●
Short circuit
Conditions of flashing