Outdoor Unit - Mitsubishi Heavy Industries SRK20ZIX-S Service Manual

(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 controller 3 minutes or more after the emergency stop, the
trouble display stops and the air conditioner resumes operation.
Indoor unit display panel
Outdoor
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
7 time 2 time
ON
flash
flash
— — —
Notes (1) The air conditioner cannot be restarted using the remote controller for 3 minutes after operation stops.
(2) The wired remote controller is optional parts.
Wired
(2)
remote Description
controller
of trouble
display
• Broken heat exchanger sensor
Heat exchanger 1 wire, poor connector
—
sensor 1 error connection
• Indoor PCB is faulty
• Broken room temperature
Room
sensor wire, poor connector
—
temperature
connection
sensor error
• Indoor PCB is faulty
• Broken heat exchanger sensor
2 wire, poor connector
Heat exchanger
—
sensor 2 error connection
• Indoor PCB is faulty
• Defective fan motor, poor
Indoor fan
E 16
motor error connector connection
• Broken outdoor air temp.
Outdoor air
sensor wire, poor connector
E 38 temperature
connection
sensor error
• Outdoor PCB is faulty
• Broken heat exchanger sensor
Outdoor heat
wire, poor connector
exchanger
E 37
connection
sensor error
• Outdoor PCB is faulty
• Broken discharge pipe sensor
Discharge pipe
wire, poor connector
E 39
sensor error
connection
• Outdoor PCB is faulty
• Compressor locking, open phase
on compressor output, short
Current cut
E 42
circuit on power transistor,
service valve is closed
• Broken compressor wire
Trouble of
E 59
• Compressor blockage

outdoor unit

• Overload operation
Current safe
• Overcharge
E 58
stop
• Compressor locking
Power
transistor
E 51 • Broken power transistor
error
• Gas shortage, defective
Over heat of
E 36
discharge pipe sensor, service
compressor
valve is closed
• Defective power supply,
Error of signal
E 5
Broken signal wire, defective
transmission
indoor/outdoor PCB
Outdoor fan
• Defective fan motor, poor
E 48
motor error
connector connection
• Overload operation, overcharge
Cooling high
• Broken outdoor heat exchange
pressure
E 35
sensor wire
protecton
• Service valve is closed
• Defective compressor
E 60
Rotor lock • Open phase on compressor
• Defective outdoor PCB
Active filter
• Defective active filter
E 47
voltage error
Refrigeration
• Service valve is closed.
cycle system
E 57
• Refrigerant is insufficient
protective
control
Error of wired
• Broken wired remote controller
E 1
remote controller
wire, defective indoor PCB
wiring
(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 2 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 conditions for turning the indoor unit's fan motor on exist during air
conditioner operation, an indoor unit fan motor speed of 300 (SRF : 150) rpm
or lower is measured for 30 seconds or longer. (The air conditioner stops.)
–55ºC or lower is detected for 5 seconds continuously 3 times within
40 minutes after initial detection of this anomalous temperature.
Or –55ºC or higher is detected for 5 seconds continuously within 20
seconds after compressor ON.
(The compressor is stopped.)
–55ºC or lower is detected for 5 seconds continuously 3 times within
40 minutes after initial detection of this anomalous temperature.
Or –55ºC or higher is detected for 5 seconds continuously within 20
seconds after compressor ON.
(The compressor is stopped.)
–25ºC or lower is detected for 5 seconds continuously 3 times within 40
minutes after initial detection of this anomalous temperature.
(The compressor is stopped.)
The compressor output 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 compressor 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 PCB and outdoor PCB 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 PCB is faulty.
When refrigeration cycle system protective control operates.
The wired remote controller wire Y is open. The wired remote
controller wires X and Y are reversely connected. Noise is penetrating
the wired remote controller lines. The wired remote controller or indoor
PCB is faulty. (The communications circuit is faulty.)
71
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Display (flashing) condition