Mitsubishi SRK50ZHX-S Technical Manual page 35

(5) Self-diagnosis table
When this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of
display lights. If the air conditioner is operated using the remote control 3 minutes or more after the emergency stop, the trouble
display stops and the air conditioner resumes operation.
Outdoor
Indoor unit display panel
unit
RUN TIMER
LED
light light
1 time
ON —
flash
2 time
ON —
flash
3 time
ON —
flash
6 time
ON —
flash
Keeps
1 time 8 time
flashing
flash flash
2 time 8 time
Keeps
flashing flash flash
Keeps
4 time 8 time
flashing
flash flash
1 time 1 time
ON
flash flash
2 time 2 time
ON
flash flash
3 time 3 time
ON
flash flash
4 time 1 time
ON
flash flash
5 time 5 time
ON
flash flash
6 time 6 time
ON
flash flash
7 time
ON ON
flash
Keeps 2 time
ON
flashing flash
2 time 2 time 7 time
flash
flash flash
5 time 2 time
ON
flash
flash
— — —
Notes (1)The air conditioner cannot be restarted using the remote control for 3 minutes after operation stops.
(2)The wired remote control is optional parts.
Wired
Description
remote
control
of trouble
display
• Broken heat exchanger sensor
Heat exchanger
—
1 wire, poor connector
sensor 1 error
connection
• Broken room temperature
Room
— sensor wire, poor connector
temperature
connection
sensor error
• Broken heat exchanger sensor
Heat exchanger
—
3 wire, poor connector
sensor 3 error
connection
Indoor fan • Defective fan motor, poor
E 16
motor error connector connection
Outdoor air
• Broken outdoor air temp.
E 38
temperature sensor wire, poor connector
sensor error
connection
Outdoor heat • Broken heat exchanger sensor
E 37 exchanger wire, poor connector
sensor error connection
• Broken discharge pipe sensor
Discharge pipe
E 39
wire, poor connector
sensor error
connection
• Compressor locking, open
phase on compressor output,
E 42 Current Cut
shortcircuit on power
transistor, closed service valve
• Broken compressor wire
Trouble of
E 59
• Compressor blockage
outdoor unit
• Overload operation
Current safe
• Overcharge
E 58
stop
• Compressor locking
Power
E 51 transistor
• Broken power transistor
error
• Gas shortage, defective
Over heat of
E 36 discharge pipe sensor, closed
compressor
service valve
• Defective power supply,
E 3 Error of signal
Broken signal wire, defective
transmission
E 5
in/outdoor unit boards
• Defective fan motor, poor
Outdoor fan
E 48
connector connection
motor error
• Overload operation, overcharge
Cooling high
• Broken outdoor heat exchange
E 35 pressure
sensor wire
protecton
• Closed service valve
• Defective compressor
Rotor lock
E 60
• Open phase on compressor
• Defective outdoor unit boards
Active filter
• Defective active filter
E 47
voltage error
• Broken wired remote control
Error of wired
E 1 remote control wire, defective indoor unit
wiring boards
(1)
Cause
When a heat exchanger sensor 1 wire disconnection is detected while
operation is stopped. (If a temperature of –28ºC or lower is detected for
15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
When a room temperature sensor wire disconnection is detected while
operation is stopped. (If a temperature of –45ºC or lower is detected for
15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
When a heat exchanger sensor wire 3 disconnection is detected while
operation is stopped. (If a temperature of –28ºC or lower is detected for
15 seconds, it is judged that the wire is disconnected.)
(Not displayed during operation.)
When conditions for turning the indoor unit's fan motor on exist during
air conditioner operation, an indoor unit fan motor speed of 300 rpm or
lower is measured for 30 seconds or longer. (The air conditioner stops.)
When an outdoor temperature sensor wire disconnection is detected
while the power is turned on or after the outdoor unit's speed has
continued at 0rps or higher for 2 minutes. (If a temperature of –55ºC or
lower is detected for 20 seconds, it is judged that wire is disconnected.)
(The compressor is stopped.)
When a heat exchanger sensor wire disconnection is detected while the
power is turned on or after the outdoor unit's speed has continued at
0rps or higher for 2 minutes. (If a temperature of –55ºC or lower is
detected for 20 seconds, it is judged that wire is disconnected.)
(The compressor is stopped.)
When a discharge pipe sensor wire disconnection is detected after the
outdoor unit's speed has continued at 0rps or higher for 10 minutes. (If
a temperature of –25ºC or lower is detected for 20 seconds, it is judged
that wire is disconnected.)
(The compressor is stopped.)
The inverter output current (compressor motor current) exceeds the set
value during compressor start.
(The air conditioner stops.)
When there is an emergency stop caused by trouble in the outdoor unit,
or the input current value is found to be lower than the set value.
(The air conditioner stops.)
When the inverter command speed is lower than the set value and the
current safe has operated. (the compressor stops)
When the power transistor is judged breakdown while compressor
starts.
(The compressor is stopped.)
When the value of the discharge pipe sensor exceeds the set value.
(The air conditioner stops.)
When there is no signal between the indoor unit's board and outdoor
unit's board for 10 seconds or longer (when the power is turned on), or
when there is no signal for 7 minute 35 seconds or longer (during
operation)(the compressor is stopped).
When the outdoor unit's fan motor speed continues for 30 seconds or
longer at 75 rpm or lower. (3 times) (The air conditioner stops.)
When the value of the outdoor heat exchanger sensor exceeds the set
value.
If the compressor motor's magnetic pole positions cannot be correctly
detected when the compressor starts.
(The air conditioner stops.)
When the wrong voltage connected for the power supply.
When the outdoor control PCB is faulty.
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.)
32
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Display (flashing) condition