Mitsubishi Heavy Industries SRRM25ZF-S, Technical Manual, Page: 97 / 127

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95
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(2) Indication of self diagnosis
Indoor unit
indicator
Outdoor unit
indicator
(LED 5)
Wired remote
control display
(optional parts)
Description of
trouble
Cause Conditions of flashing
On for 4 sec-
onds and off
for 4 seconds
Outdoor heat exchan-
ger sensor error
Indoor heat exchanger
sensor (1) error
Room temperature
sensor error
Outdoor air tempera-
ture sensor error
Current cut
Discharge pipe sensor
error
Comp. suction sensor
error
Over heat of compressor
Indoor heat exchange
sensor (2) error
Closed service valve
Indoor heat exchanger
sensor (1) error
Indoor fan motor error
Broken discharge pipe sensor wire
Connector poor connection
When heat exchanger sensor (1) temperature of
–20
°
C or under continued for more than 15
seconds while operation is stopped. (This is not
displayed during operation.)
When room temperature sensor temperature of
–20
°
C or under continued for more than 15
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
300 rpm or under continued for more than 30
seconds. (Air conditioner stops.)
After cooling starts, when the temperature
difference at the indoor heat exchanger sensor (1)
after 13 minutes and after 16 minutes is greater
than –2ºC, operation is stopped.
When outdoor air temperature sensor temperature
of –20
°
C or under continued for more than 10
seconds while operation is stopped. (This is not
displayed during operation.)
When heat exchanger sensor temperature of –20
°
C or under continued for more than 10 seconds
while operation is stopped. (This is not displayed
during operation.)
When converter output current which exceeds
setting value is detected. (Compressor stops.)
When heat exchanger sensor (2) temperature of
–20
°
C or under continued for more than 15
seconds while operation is stopped. (This is not
displayed during operation.)
After the decision speed has been 0 rps or more for
9 continuous minutes and the discharge pipe sensor
has sent a 10 second or more broken wire signal.
(Compressor is stopped.)
When discharge pipe sensor value exceeds setting
value.
(Compressor Stops.)
•
•
•
•
•
•
Current safe stop
When the decision speed is 30 rps or less and the
current save has operated. (Compressor stops)
Overload operation
Overcharge •
•
Gas shortage
Defective discharge pipe sensor
•
•
•
•
•
Error of signal trans-
mission
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. •
•
•
•
•
Broken heat exchanger sensor (2)
wire
Connector poor connection
Disconnected sensor
Drain abnormality
(STM, SRRM only)
Float switch motion
•
• Drain at reverse gradient
Float switch defective
•
• Closed service valve
Heat exchanger sensor (1) is
disconnected.
•
•
Broken comp. suction sensor wire
Poor connector connection
When comp. suction sensor temperature of
–20
°
C or under continued for more than 10
seconds while operation is stopped.
•
•
Compressor lock
Defective compressor
Defective outdoor PCB
When the motor for the compressor does not turn
1/12 revolution 0.044 second after it has been started.
•
• Error of wired
remote control wiring Broken wired remote control wire
Defective indoor unit boards
Broken heat exchanger sensor (1)
wire
Connector poor connection
Disconnected sensor
•
•
Broken room temperature sensor
wire
Connector poor connection
•
•
Broken heat exchanger sensor
wire
Poor connector connection
•
•
Broken outdoor air temperature
sensor wire
Poor connector connection
•
•
Defective fan motor
Connector poor connection
•
•
• Compressor locking
Open phase on compressor output
Shortcircuit on power transistor
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.)
Defective power transistor.
Broken compressor wire
Compressor blockage
Trouble of outdoor
unit
RUN
light
1 time
flash
2 time
flash
4 time
flash
5 time
flash
6 time
flash
7 time
flash
Keeps
flashing
Keeps
flashing
Keep
flashing
Keep
flashing
Comes
on
Comes
on
Comes
on
Comes
on
Comes
on
2 time
flash
TIMER
light
Comes
on
Comes
on
Comes
on
Comes
on
Comes
on
Comes
on
1 time
flash
2 time
flash
4 time
flash
5 time
flash
1 time
flash
2 time
flash
3 time
flash
5 time
flash
6 time
flash
2 time
flash
E6
E7
E9
E6
E16
E6
E38
E37
E39
E53
E42
E59
E58
E36
E5
E60
E1
The wired remote control wire Y is open. The wired
remote control wires X and Y are reversely connected.
Noise is penetrating the wired remote control lines. The
wired remote control or indoor control PCB is faulty.
(The communications circuit is faulty.)
Stays off
Stays off
Stays off
Stays off
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